CVE-2022-48943 (GCVE-0-2022-48943)

Vulnerability from cvelistv5 – Published: 2024-08-22 03:30 – Updated: 2025-12-23 13:21
VLAI?
Title
KVM: x86/mmu: make apf token non-zero to fix bug
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: make apf token non-zero to fix bug In current async pagefault logic, when a page is ready, KVM relies on kvm_arch_can_dequeue_async_page_present() to determine whether to deliver a READY event to the Guest. This function test token value of struct kvm_vcpu_pv_apf_data, which must be reset to zero by Guest kernel when a READY event is finished by Guest. If value is zero meaning that a READY event is done, so the KVM can deliver another. But the kvm_arch_setup_async_pf() may produce a valid token with zero value, which is confused with previous mention and may lead the loss of this READY event. This bug may cause task blocked forever in Guest: INFO: task stress:7532 blocked for more than 1254 seconds. Not tainted 5.10.0 #16 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:stress state:D stack: 0 pid: 7532 ppid: 1409 flags:0x00000080 Call Trace: __schedule+0x1e7/0x650 schedule+0x46/0xb0 kvm_async_pf_task_wait_schedule+0xad/0xe0 ? exit_to_user_mode_prepare+0x60/0x70 __kvm_handle_async_pf+0x4f/0xb0 ? asm_exc_page_fault+0x8/0x30 exc_page_fault+0x6f/0x110 ? asm_exc_page_fault+0x8/0x30 asm_exc_page_fault+0x1e/0x30 RIP: 0033:0x402d00 RSP: 002b:00007ffd31912500 EFLAGS: 00010206 RAX: 0000000000071000 RBX: ffffffffffffffff RCX: 00000000021a32b0 RDX: 000000000007d011 RSI: 000000000007d000 RDI: 00000000021262b0 RBP: 00000000021262b0 R08: 0000000000000003 R09: 0000000000000086 R10: 00000000000000eb R11: 00007fefbdf2baa0 R12: 0000000000000000 R13: 0000000000000002 R14: 000000000007d000 R15: 0000000000001000
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2635b5c4a0e407b84f68e188c719f28ba0e9ae1b , < 72fdfc75d4217b32363cc80def3de2cb3fef3f02 (git)
Affected: 2635b5c4a0e407b84f68e188c719f28ba0e9ae1b , < 4c3644b6c96c5daa5149e5abddc07234eea47c7c (git)
Affected: 2635b5c4a0e407b84f68e188c719f28ba0e9ae1b , < 62040f5cd7d937de547836e747b6aa8212fec573 (git)
Affected: 2635b5c4a0e407b84f68e188c719f28ba0e9ae1b , < 6f3c1fc53d86d580d8d6d749c4af23705e4f6f79 (git)
Create a notification for this product.
    Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.103 , ≤ 5.10.* (semver)
Unaffected: 5.15.26 , ≤ 5.15.* (semver)
Unaffected: 5.16.12 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2022-48943",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T15:33:08.943998Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-12T17:33:10.679Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/mmu/mmu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "72fdfc75d4217b32363cc80def3de2cb3fef3f02",
              "status": "affected",
              "version": "2635b5c4a0e407b84f68e188c719f28ba0e9ae1b",
              "versionType": "git"
            },
            {
              "lessThan": "4c3644b6c96c5daa5149e5abddc07234eea47c7c",
              "status": "affected",
              "version": "2635b5c4a0e407b84f68e188c719f28ba0e9ae1b",
              "versionType": "git"
            },
            {
              "lessThan": "62040f5cd7d937de547836e747b6aa8212fec573",
              "status": "affected",
              "version": "2635b5c4a0e407b84f68e188c719f28ba0e9ae1b",
              "versionType": "git"
            },
            {
              "lessThan": "6f3c1fc53d86d580d8d6d749c4af23705e4f6f79",
              "status": "affected",
              "version": "2635b5c4a0e407b84f68e188c719f28ba0e9ae1b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/mmu/mmu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.8"
            },
            {
              "lessThan": "5.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.26",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.16.*",
              "status": "unaffected",
              "version": "5.16.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.103",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.26",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.16.12",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.17",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86/mmu: make apf token non-zero to fix bug\n\nIn current async pagefault logic, when a page is ready, KVM relies on\nkvm_arch_can_dequeue_async_page_present() to determine whether to deliver\na READY event to the Guest. This function test token value of struct\nkvm_vcpu_pv_apf_data, which must be reset to zero by Guest kernel when a\nREADY event is finished by Guest. If value is zero meaning that a READY\nevent is done, so the KVM can deliver another.\nBut the kvm_arch_setup_async_pf() may produce a valid token with zero\nvalue, which is confused with previous mention and may lead the loss of\nthis READY event.\n\nThis bug may cause task blocked forever in Guest:\n INFO: task stress:7532 blocked for more than 1254 seconds.\n       Not tainted 5.10.0 #16\n \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\n task:stress          state:D stack:    0 pid: 7532 ppid:  1409\n flags:0x00000080\n Call Trace:\n  __schedule+0x1e7/0x650\n  schedule+0x46/0xb0\n  kvm_async_pf_task_wait_schedule+0xad/0xe0\n  ? exit_to_user_mode_prepare+0x60/0x70\n  __kvm_handle_async_pf+0x4f/0xb0\n  ? asm_exc_page_fault+0x8/0x30\n  exc_page_fault+0x6f/0x110\n  ? asm_exc_page_fault+0x8/0x30\n  asm_exc_page_fault+0x1e/0x30\n RIP: 0033:0x402d00\n RSP: 002b:00007ffd31912500 EFLAGS: 00010206\n RAX: 0000000000071000 RBX: ffffffffffffffff RCX: 00000000021a32b0\n RDX: 000000000007d011 RSI: 000000000007d000 RDI: 00000000021262b0\n RBP: 00000000021262b0 R08: 0000000000000003 R09: 0000000000000086\n R10: 00000000000000eb R11: 00007fefbdf2baa0 R12: 0000000000000000\n R13: 0000000000000002 R14: 000000000007d000 R15: 0000000000001000"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-23T13:21:11.553Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/72fdfc75d4217b32363cc80def3de2cb3fef3f02"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c3644b6c96c5daa5149e5abddc07234eea47c7c"
        },
        {
          "url": "https://git.kernel.org/stable/c/62040f5cd7d937de547836e747b6aa8212fec573"
        },
        {
          "url": "https://git.kernel.org/stable/c/6f3c1fc53d86d580d8d6d749c4af23705e4f6f79"
        }
      ],
      "title": "KVM: x86/mmu: make apf token non-zero to fix bug",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-48943",
    "datePublished": "2024-08-22T03:30:14.027Z",
    "dateReserved": "2024-08-22T01:27:53.623Z",
    "dateUpdated": "2025-12-23T13:21:11.553Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-48943\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T15:33:08.943998Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:15.638Z\"}}], \"cna\": {\"title\": \"KVM: x86/mmu: make apf token non-zero to fix bug\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2635b5c4a0e407b84f68e188c719f28ba0e9ae1b\", \"lessThan\": \"72fdfc75d4217b32363cc80def3de2cb3fef3f02\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2635b5c4a0e407b84f68e188c719f28ba0e9ae1b\", \"lessThan\": \"4c3644b6c96c5daa5149e5abddc07234eea47c7c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2635b5c4a0e407b84f68e188c719f28ba0e9ae1b\", \"lessThan\": \"62040f5cd7d937de547836e747b6aa8212fec573\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2635b5c4a0e407b84f68e188c719f28ba0e9ae1b\", \"lessThan\": \"6f3c1fc53d86d580d8d6d749c4af23705e4f6f79\", \"versionType\": \"git\"}], \"programFiles\": [\"arch/x86/kvm/mmu/mmu.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.8\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.8\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.103\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.26\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.16.*\"}, {\"status\": \"unaffected\", \"version\": \"5.17\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"arch/x86/kvm/mmu/mmu.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/72fdfc75d4217b32363cc80def3de2cb3fef3f02\"}, {\"url\": \"https://git.kernel.org/stable/c/4c3644b6c96c5daa5149e5abddc07234eea47c7c\"}, {\"url\": \"https://git.kernel.org/stable/c/62040f5cd7d937de547836e747b6aa8212fec573\"}, {\"url\": \"https://git.kernel.org/stable/c/6f3c1fc53d86d580d8d6d749c4af23705e4f6f79\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nKVM: x86/mmu: make apf token non-zero to fix bug\\n\\nIn current async pagefault logic, when a page is ready, KVM relies on\\nkvm_arch_can_dequeue_async_page_present() to determine whether to deliver\\na READY event to the Guest. This function test token value of struct\\nkvm_vcpu_pv_apf_data, which must be reset to zero by Guest kernel when a\\nREADY event is finished by Guest. If value is zero meaning that a READY\\nevent is done, so the KVM can deliver another.\\nBut the kvm_arch_setup_async_pf() may produce a valid token with zero\\nvalue, which is confused with previous mention and may lead the loss of\\nthis READY event.\\n\\nThis bug may cause task blocked forever in Guest:\\n INFO: task stress:7532 blocked for more than 1254 seconds.\\n       Not tainted 5.10.0 #16\\n \\\"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\\\" disables this message.\\n task:stress          state:D stack:    0 pid: 7532 ppid:  1409\\n flags:0x00000080\\n Call Trace:\\n  __schedule+0x1e7/0x650\\n  schedule+0x46/0xb0\\n  kvm_async_pf_task_wait_schedule+0xad/0xe0\\n  ? exit_to_user_mode_prepare+0x60/0x70\\n  __kvm_handle_async_pf+0x4f/0xb0\\n  ? asm_exc_page_fault+0x8/0x30\\n  exc_page_fault+0x6f/0x110\\n  ? asm_exc_page_fault+0x8/0x30\\n  asm_exc_page_fault+0x1e/0x30\\n RIP: 0033:0x402d00\\n RSP: 002b:00007ffd31912500 EFLAGS: 00010206\\n RAX: 0000000000071000 RBX: ffffffffffffffff RCX: 00000000021a32b0\\n RDX: 000000000007d011 RSI: 000000000007d000 RDI: 00000000021262b0\\n RBP: 00000000021262b0 R08: 0000000000000003 R09: 0000000000000086\\n R10: 00000000000000eb R11: 00007fefbdf2baa0 R12: 0000000000000000\\n R13: 0000000000000002 R14: 000000000007d000 R15: 0000000000001000\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.103\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.26\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16.12\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17\", \"versionStartIncluding\": \"5.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-12-23T13:21:11.553Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-48943\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-12-23T13:21:11.553Z\", \"dateReserved\": \"2024-08-22T01:27:53.623Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-08-22T03:30:14.027Z\", \"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.