CVE-2024-42245 (GCVE-0-2024-42245)

Vulnerability from cvelistv5 – Published: 2024-08-07 15:14 – Updated: 2025-11-03 22:02
VLAI?
Title
Revert "sched/fair: Make sure to try to detach at least one movable task"
Summary
In the Linux kernel, the following vulnerability has been resolved: Revert "sched/fair: Make sure to try to detach at least one movable task" This reverts commit b0defa7ae03ecf91b8bfd10ede430cff12fcbd06. b0defa7ae03ec changed the load balancing logic to ignore env.max_loop if all tasks examined to that point were pinned. The goal of the patch was to make it more likely to be able to detach a task buried in a long list of pinned tasks. However, this has the unfortunate side effect of creating an O(n) iteration in detach_tasks(), as we now must fully iterate every task on a cpu if all or most are pinned. Since this load balance code is done with rq lock held, and often in softirq context, it is very easy to trigger hard lockups. We observed such hard lockups with a user who affined O(10k) threads to a single cpu. When I discussed this with Vincent he initially suggested that we keep the limit on the number of tasks to detach, but increase the number of tasks we can search. However, after some back and forth on the mailing list, he recommended we instead revert the original patch, as it seems likely no one was actually getting hit by the original issue.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b0defa7ae03ecf91b8bfd10ede430cff12fcbd06 , < d467194018dd536fe6c65a2fd3aedfcdb1424903 (git)
Affected: b0defa7ae03ecf91b8bfd10ede430cff12fcbd06 , < 1e116c18e32b035a2d1bd460800072c8bf96bc44 (git)
Affected: b0defa7ae03ecf91b8bfd10ede430cff12fcbd06 , < 0fa6dcbfa2e2b97c1e6febbea561badf0931a38b (git)
Affected: b0defa7ae03ecf91b8bfd10ede430cff12fcbd06 , < 2feab2492deb2f14f9675dd6388e9e2bf669c27a (git)
Create a notification for this product.
    Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (semver)
Unaffected: 6.1.100 , ≤ 6.1.* (semver)
Unaffected: 6.6.41 , ≤ 6.6.* (semver)
Unaffected: 6.9.10 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-42245",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T16:13:35.095987Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-11T17:34:31.221Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T22:02:45.175Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/sched/fair.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d467194018dd536fe6c65a2fd3aedfcdb1424903",
              "status": "affected",
              "version": "b0defa7ae03ecf91b8bfd10ede430cff12fcbd06",
              "versionType": "git"
            },
            {
              "lessThan": "1e116c18e32b035a2d1bd460800072c8bf96bc44",
              "status": "affected",
              "version": "b0defa7ae03ecf91b8bfd10ede430cff12fcbd06",
              "versionType": "git"
            },
            {
              "lessThan": "0fa6dcbfa2e2b97c1e6febbea561badf0931a38b",
              "status": "affected",
              "version": "b0defa7ae03ecf91b8bfd10ede430cff12fcbd06",
              "versionType": "git"
            },
            {
              "lessThan": "2feab2492deb2f14f9675dd6388e9e2bf669c27a",
              "status": "affected",
              "version": "b0defa7ae03ecf91b8bfd10ede430cff12fcbd06",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/sched/fair.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.1"
            },
            {
              "lessThan": "6.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.100",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.41",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.9.*",
              "status": "unaffected",
              "version": "6.9.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.10",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.100",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.41",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.9.10",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.10",
                  "versionStartIncluding": "6.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"sched/fair: Make sure to try to detach at least one movable task\"\n\nThis reverts commit b0defa7ae03ecf91b8bfd10ede430cff12fcbd06.\n\nb0defa7ae03ec changed the load balancing logic to ignore env.max_loop if\nall tasks examined to that point were pinned. The goal of the patch was\nto make it more likely to be able to detach a task buried in a long list\nof pinned tasks. However, this has the unfortunate side effect of\ncreating an O(n) iteration in detach_tasks(), as we now must fully\niterate every task on a cpu if all or most are pinned. Since this load\nbalance code is done with rq lock held, and often in softirq context, it\nis very easy to trigger hard lockups. We observed such hard lockups with\na user who affined O(10k) threads to a single cpu.\n\nWhen I discussed this with Vincent he initially suggested that we keep\nthe limit on the number of tasks to detach, but increase the number of\ntasks we can search. However, after some back and forth on the mailing\nlist, he recommended we instead revert the original patch, as it seems\nlikely no one was actually getting hit by the original issue."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T09:24:58.655Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d467194018dd536fe6c65a2fd3aedfcdb1424903"
        },
        {
          "url": "https://git.kernel.org/stable/c/1e116c18e32b035a2d1bd460800072c8bf96bc44"
        },
        {
          "url": "https://git.kernel.org/stable/c/0fa6dcbfa2e2b97c1e6febbea561badf0931a38b"
        },
        {
          "url": "https://git.kernel.org/stable/c/2feab2492deb2f14f9675dd6388e9e2bf669c27a"
        }
      ],
      "title": "Revert \"sched/fair: Make sure to try to detach at least one movable task\"",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-42245",
    "datePublished": "2024-08-07T15:14:31.019Z",
    "dateReserved": "2024-07-30T07:40:12.254Z",
    "dateUpdated": "2025-11-03T22:02:45.175Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T22:02:45.175Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-42245\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T16:13:35.095987Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:24.180Z\"}}], \"cna\": {\"title\": \"Revert \\\"sched/fair: Make sure to try to detach at least one movable task\\\"\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"b0defa7ae03ecf91b8bfd10ede430cff12fcbd06\", \"lessThan\": \"d467194018dd536fe6c65a2fd3aedfcdb1424903\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b0defa7ae03ecf91b8bfd10ede430cff12fcbd06\", \"lessThan\": \"1e116c18e32b035a2d1bd460800072c8bf96bc44\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b0defa7ae03ecf91b8bfd10ede430cff12fcbd06\", \"lessThan\": \"0fa6dcbfa2e2b97c1e6febbea561badf0931a38b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b0defa7ae03ecf91b8bfd10ede430cff12fcbd06\", \"lessThan\": \"2feab2492deb2f14f9675dd6388e9e2bf669c27a\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/sched/fair.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.1\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.1\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.100\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.41\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/sched/fair.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d467194018dd536fe6c65a2fd3aedfcdb1424903\"}, {\"url\": \"https://git.kernel.org/stable/c/1e116c18e32b035a2d1bd460800072c8bf96bc44\"}, {\"url\": \"https://git.kernel.org/stable/c/0fa6dcbfa2e2b97c1e6febbea561badf0931a38b\"}, {\"url\": \"https://git.kernel.org/stable/c/2feab2492deb2f14f9675dd6388e9e2bf669c27a\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nRevert \\\"sched/fair: Make sure to try to detach at least one movable task\\\"\\n\\nThis reverts commit b0defa7ae03ecf91b8bfd10ede430cff12fcbd06.\\n\\nb0defa7ae03ec changed the load balancing logic to ignore env.max_loop if\\nall tasks examined to that point were pinned. The goal of the patch was\\nto make it more likely to be able to detach a task buried in a long list\\nof pinned tasks. However, this has the unfortunate side effect of\\ncreating an O(n) iteration in detach_tasks(), as we now must fully\\niterate every task on a cpu if all or most are pinned. Since this load\\nbalance code is done with rq lock held, and often in softirq context, it\\nis very easy to trigger hard lockups. We observed such hard lockups with\\na user who affined O(10k) threads to a single cpu.\\n\\nWhen I discussed this with Vincent he initially suggested that we keep\\nthe limit on the number of tasks to detach, but increase the number of\\ntasks we can search. However, after some back and forth on the mailing\\nlist, he recommended we instead revert the original patch, as it seems\\nlikely no one was actually getting hit by the original issue.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.100\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.41\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.10\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"6.1\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:24:58.655Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-42245\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T22:02:45.175Z\", \"dateReserved\": \"2024-07-30T07:40:12.254Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-08-07T15:14:31.019Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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.