CVE-2023-52879 (GCVE-0-2023-52879)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:32 – Updated: 2025-05-04 07:45
VLAI?
Title
tracing: Have trace_event_file have ref counters
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing: Have trace_event_file have ref counters The following can crash the kernel: # cd /sys/kernel/tracing # echo 'p:sched schedule' > kprobe_events # exec 5>>events/kprobes/sched/enable # > kprobe_events # exec 5>&- The above commands: 1. Change directory to the tracefs directory 2. Create a kprobe event (doesn't matter what one) 3. Open bash file descriptor 5 on the enable file of the kprobe event 4. Delete the kprobe event (removes the files too) 5. Close the bash file descriptor 5 The above causes a crash! BUG: kernel NULL pointer dereference, address: 0000000000000028 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 6 PID: 877 Comm: bash Not tainted 6.5.0-rc4-test-00008-g2c6b6b1029d4-dirty #186 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:tracing_release_file_tr+0xc/0x50 What happens here is that the kprobe event creates a trace_event_file "file" descriptor that represents the file in tracefs to the event. It maintains state of the event (is it enabled for the given instance?). Opening the "enable" file gets a reference to the event "file" descriptor via the open file descriptor. When the kprobe event is deleted, the file is also deleted from the tracefs system which also frees the event "file" descriptor. But as the tracefs file is still opened by user space, it will not be totally removed until the final dput() is called on it. But this is not true with the event "file" descriptor that is already freed. If the user does a write to or simply closes the file descriptor it will reference the event "file" descriptor that was just freed, causing a use-after-free bug. To solve this, add a ref count to the event "file" descriptor as well as a new flag called "FREED". The "file" will not be freed until the last reference is released. But the FREE flag will be set when the event is removed to prevent any more modifications to that event from happening, even if there's still a reference to the event "file" descriptor.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e6807c873d8791ae5a5186ad05ec66cab926539a , < 961c4511c7578d6b8f39118be919016ec3db1c1e (git)
Affected: 407bf1c140f0757706c0b28604bcc90837d45ce2 , < a98172e36e5f1b3d29ad71fade2d611cfcc2fe6f (git)
Affected: fa6d449e4d024d8c17f4288e0567d28ace69415c , < cbc7c29dff0fa18162f2a3889d82eeefd67305e0 (git)
Affected: a46bf337a20f9edd3c8041b025639842280d0575 , < 2fa74d29fc1899c237d51bf9a6e132ea5c488976 (git)
Affected: 9beec04370132a7a6cd1aa9897f6fffc6262ff28 , < 2c9de867ca285c397cd71af703763fe416265706 (git)
Affected: f5ca233e2e66dc1c249bf07eefa37e34a6c9346a , < 9034c87d61be8cff989017740a91701ac8195a1d (git)
Affected: f5ca233e2e66dc1c249bf07eefa37e34a6c9346a , < bb32500fb9b78215e4ef6ee8b4345c5f5d7eafb4 (git)
Create a notification for this product.
    Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 5.4.262 , ≤ 5.4.* (semver)
Unaffected: 5.10.202 , ≤ 5.10.* (semver)
Unaffected: 5.15.140 , ≤ 5.15.* (semver)
Unaffected: 6.1.64 , ≤ 6.1.* (semver)
Unaffected: 6.5.13 , ≤ 6.5.* (semver)
Unaffected: 6.6.1 , ≤ 6.6.* (semver)
Unaffected: 6.7 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2023-52879",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-21T16:59:47.559597Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-04T17:23:30.864Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T23:18:41.182Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/961c4511c7578d6b8f39118be919016ec3db1c1e"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/a98172e36e5f1b3d29ad71fade2d611cfcc2fe6f"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/cbc7c29dff0fa18162f2a3889d82eeefd67305e0"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/2fa74d29fc1899c237d51bf9a6e132ea5c488976"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/2c9de867ca285c397cd71af703763fe416265706"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/9034c87d61be8cff989017740a91701ac8195a1d"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/bb32500fb9b78215e4ef6ee8b4345c5f5d7eafb4"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/trace_events.h",
            "kernel/trace/trace.c",
            "kernel/trace/trace.h",
            "kernel/trace/trace_events.c",
            "kernel/trace/trace_events_filter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "961c4511c7578d6b8f39118be919016ec3db1c1e",
              "status": "affected",
              "version": "e6807c873d8791ae5a5186ad05ec66cab926539a",
              "versionType": "git"
            },
            {
              "lessThan": "a98172e36e5f1b3d29ad71fade2d611cfcc2fe6f",
              "status": "affected",
              "version": "407bf1c140f0757706c0b28604bcc90837d45ce2",
              "versionType": "git"
            },
            {
              "lessThan": "cbc7c29dff0fa18162f2a3889d82eeefd67305e0",
              "status": "affected",
              "version": "fa6d449e4d024d8c17f4288e0567d28ace69415c",
              "versionType": "git"
            },
            {
              "lessThan": "2fa74d29fc1899c237d51bf9a6e132ea5c488976",
              "status": "affected",
              "version": "a46bf337a20f9edd3c8041b025639842280d0575",
              "versionType": "git"
            },
            {
              "lessThan": "2c9de867ca285c397cd71af703763fe416265706",
              "status": "affected",
              "version": "9beec04370132a7a6cd1aa9897f6fffc6262ff28",
              "versionType": "git"
            },
            {
              "lessThan": "9034c87d61be8cff989017740a91701ac8195a1d",
              "status": "affected",
              "version": "f5ca233e2e66dc1c249bf07eefa37e34a6c9346a",
              "versionType": "git"
            },
            {
              "lessThan": "bb32500fb9b78215e4ef6ee8b4345c5f5d7eafb4",
              "status": "affected",
              "version": "f5ca233e2e66dc1c249bf07eefa37e34a6c9346a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/trace_events.h",
            "kernel/trace/trace.c",
            "kernel/trace/trace.h",
            "kernel/trace/trace_events.c",
            "kernel/trace/trace_events_filter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.262",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.202",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.140",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.64",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.5.*",
              "status": "unaffected",
              "version": "6.5.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.7",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.262",
                  "versionStartIncluding": "5.4.258",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.202",
                  "versionStartIncluding": "5.10.198",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.140",
                  "versionStartIncluding": "5.15.134",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.64",
                  "versionStartIncluding": "6.1.55",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.5.13",
                  "versionStartIncluding": "6.5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.1",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.7",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Have trace_event_file have ref counters\n\nThe following can crash the kernel:\n\n # cd /sys/kernel/tracing\n # echo \u0027p:sched schedule\u0027 \u003e kprobe_events\n # exec 5\u003e\u003eevents/kprobes/sched/enable\n # \u003e kprobe_events\n # exec 5\u003e\u0026-\n\nThe above commands:\n\n 1. Change directory to the tracefs directory\n 2. Create a kprobe event (doesn\u0027t matter what one)\n 3. Open bash file descriptor 5 on the enable file of the kprobe event\n 4. Delete the kprobe event (removes the files too)\n 5. Close the bash file descriptor 5\n\nThe above causes a crash!\n\n BUG: kernel NULL pointer dereference, address: 0000000000000028\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: 0000 [#1] PREEMPT SMP PTI\n CPU: 6 PID: 877 Comm: bash Not tainted 6.5.0-rc4-test-00008-g2c6b6b1029d4-dirty #186\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014\n RIP: 0010:tracing_release_file_tr+0xc/0x50\n\nWhat happens here is that the kprobe event creates a trace_event_file\n\"file\" descriptor that represents the file in tracefs to the event. It\nmaintains state of the event (is it enabled for the given instance?).\nOpening the \"enable\" file gets a reference to the event \"file\" descriptor\nvia the open file descriptor. When the kprobe event is deleted, the file is\nalso deleted from the tracefs system which also frees the event \"file\"\ndescriptor.\n\nBut as the tracefs file is still opened by user space, it will not be\ntotally removed until the final dput() is called on it. But this is not\ntrue with the event \"file\" descriptor that is already freed. If the user\ndoes a write to or simply closes the file descriptor it will reference the\nevent \"file\" descriptor that was just freed, causing a use-after-free bug.\n\nTo solve this, add a ref count to the event \"file\" descriptor as well as a\nnew flag called \"FREED\". The \"file\" will not be freed until the last\nreference is released. But the FREE flag will be set when the event is\nremoved to prevent any more modifications to that event from happening,\neven if there\u0027s still a reference to the event \"file\" descriptor."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:45:07.175Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/961c4511c7578d6b8f39118be919016ec3db1c1e"
        },
        {
          "url": "https://git.kernel.org/stable/c/a98172e36e5f1b3d29ad71fade2d611cfcc2fe6f"
        },
        {
          "url": "https://git.kernel.org/stable/c/cbc7c29dff0fa18162f2a3889d82eeefd67305e0"
        },
        {
          "url": "https://git.kernel.org/stable/c/2fa74d29fc1899c237d51bf9a6e132ea5c488976"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c9de867ca285c397cd71af703763fe416265706"
        },
        {
          "url": "https://git.kernel.org/stable/c/9034c87d61be8cff989017740a91701ac8195a1d"
        },
        {
          "url": "https://git.kernel.org/stable/c/bb32500fb9b78215e4ef6ee8b4345c5f5d7eafb4"
        }
      ],
      "title": "tracing: Have trace_event_file have ref counters",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-52879",
    "datePublished": "2024-05-21T15:32:11.263Z",
    "dateReserved": "2024-05-21T15:19:24.265Z",
    "dateUpdated": "2025-05-04T07:45:07.175Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/961c4511c7578d6b8f39118be919016ec3db1c1e\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/a98172e36e5f1b3d29ad71fade2d611cfcc2fe6f\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/cbc7c29dff0fa18162f2a3889d82eeefd67305e0\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/2fa74d29fc1899c237d51bf9a6e132ea5c488976\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/2c9de867ca285c397cd71af703763fe416265706\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/9034c87d61be8cff989017740a91701ac8195a1d\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/bb32500fb9b78215e4ef6ee8b4345c5f5d7eafb4\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T23:18:41.182Z\"}}, {\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-52879\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-05-21T16:59:47.559597Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-23T19:01:25.231Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"tracing: Have trace_event_file have ref counters\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"e6807c873d8791ae5a5186ad05ec66cab926539a\", \"lessThan\": \"961c4511c7578d6b8f39118be919016ec3db1c1e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"407bf1c140f0757706c0b28604bcc90837d45ce2\", \"lessThan\": \"a98172e36e5f1b3d29ad71fade2d611cfcc2fe6f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fa6d449e4d024d8c17f4288e0567d28ace69415c\", \"lessThan\": \"cbc7c29dff0fa18162f2a3889d82eeefd67305e0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a46bf337a20f9edd3c8041b025639842280d0575\", \"lessThan\": \"2fa74d29fc1899c237d51bf9a6e132ea5c488976\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9beec04370132a7a6cd1aa9897f6fffc6262ff28\", \"lessThan\": \"2c9de867ca285c397cd71af703763fe416265706\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f5ca233e2e66dc1c249bf07eefa37e34a6c9346a\", \"lessThan\": \"9034c87d61be8cff989017740a91701ac8195a1d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f5ca233e2e66dc1c249bf07eefa37e34a6c9346a\", \"lessThan\": \"bb32500fb9b78215e4ef6ee8b4345c5f5d7eafb4\", \"versionType\": \"git\"}], \"programFiles\": [\"include/linux/trace_events.h\", \"kernel/trace/trace.c\", \"kernel/trace/trace.h\", \"kernel/trace/trace_events.c\", \"kernel/trace/trace_events_filter.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.6\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.6\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.262\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.202\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.140\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.64\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.5.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.5.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/linux/trace_events.h\", \"kernel/trace/trace.c\", \"kernel/trace/trace.h\", \"kernel/trace/trace_events.c\", \"kernel/trace/trace_events_filter.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/961c4511c7578d6b8f39118be919016ec3db1c1e\"}, {\"url\": \"https://git.kernel.org/stable/c/a98172e36e5f1b3d29ad71fade2d611cfcc2fe6f\"}, {\"url\": \"https://git.kernel.org/stable/c/cbc7c29dff0fa18162f2a3889d82eeefd67305e0\"}, {\"url\": \"https://git.kernel.org/stable/c/2fa74d29fc1899c237d51bf9a6e132ea5c488976\"}, {\"url\": \"https://git.kernel.org/stable/c/2c9de867ca285c397cd71af703763fe416265706\"}, {\"url\": \"https://git.kernel.org/stable/c/9034c87d61be8cff989017740a91701ac8195a1d\"}, {\"url\": \"https://git.kernel.org/stable/c/bb32500fb9b78215e4ef6ee8b4345c5f5d7eafb4\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntracing: Have trace_event_file have ref counters\\n\\nThe following can crash the kernel:\\n\\n # cd /sys/kernel/tracing\\n # echo \u0027p:sched schedule\u0027 \u003e kprobe_events\\n # exec 5\u003e\u003eevents/kprobes/sched/enable\\n # \u003e kprobe_events\\n # exec 5\u003e\u0026-\\n\\nThe above commands:\\n\\n 1. Change directory to the tracefs directory\\n 2. Create a kprobe event (doesn\u0027t matter what one)\\n 3. Open bash file descriptor 5 on the enable file of the kprobe event\\n 4. Delete the kprobe event (removes the files too)\\n 5. Close the bash file descriptor 5\\n\\nThe above causes a crash!\\n\\n BUG: kernel NULL pointer dereference, address: 0000000000000028\\n #PF: supervisor read access in kernel mode\\n #PF: error_code(0x0000) - not-present page\\n PGD 0 P4D 0\\n Oops: 0000 [#1] PREEMPT SMP PTI\\n CPU: 6 PID: 877 Comm: bash Not tainted 6.5.0-rc4-test-00008-g2c6b6b1029d4-dirty #186\\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014\\n RIP: 0010:tracing_release_file_tr+0xc/0x50\\n\\nWhat happens here is that the kprobe event creates a trace_event_file\\n\\\"file\\\" descriptor that represents the file in tracefs to the event. It\\nmaintains state of the event (is it enabled for the given instance?).\\nOpening the \\\"enable\\\" file gets a reference to the event \\\"file\\\" descriptor\\nvia the open file descriptor. When the kprobe event is deleted, the file is\\nalso deleted from the tracefs system which also frees the event \\\"file\\\"\\ndescriptor.\\n\\nBut as the tracefs file is still opened by user space, it will not be\\ntotally removed until the final dput() is called on it. But this is not\\ntrue with the event \\\"file\\\" descriptor that is already freed. If the user\\ndoes a write to or simply closes the file descriptor it will reference the\\nevent \\\"file\\\" descriptor that was just freed, causing a use-after-free bug.\\n\\nTo solve this, add a ref count to the event \\\"file\\\" descriptor as well as a\\nnew flag called \\\"FREED\\\". The \\\"file\\\" will not be freed until the last\\nreference is released. But the FREE flag will be set when the event is\\nremoved to prevent any more modifications to that event from happening,\\neven if there\u0027s still a reference to the event \\\"file\\\" descriptor.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.262\", \"versionStartIncluding\": \"5.4.258\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.202\", \"versionStartIncluding\": \"5.10.198\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.140\", \"versionStartIncluding\": \"5.15.134\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.64\", \"versionStartIncluding\": \"6.1.55\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.5.13\", \"versionStartIncluding\": \"6.5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.1\", \"versionStartIncluding\": \"6.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7\", \"versionStartIncluding\": \"6.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:45:07.175Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52879\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:45:07.175Z\", \"dateReserved\": \"2024-05-21T15:19:24.265Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T15:32:11.263Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.