CVE-2022-49443 (GCVE-0-2022-49443)
Vulnerability from cvelistv5
Published
2025-02-26 02:12
Modified
2025-05-04 08:37
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: list: fix a data-race around ep->rdllist ep_poll() first calls ep_events_available() with no lock held and checks if ep->rdllist is empty by list_empty_careful(), which reads rdllist->prev. Thus all accesses to it need some protection to avoid store/load-tearing. Note INIT_LIST_HEAD_RCU() already has the annotation for both prev and next. Commit bf3b9f6372c4 ("epoll: Add busy poll support to epoll with socket fds.") added the first lockless ep_events_available(), and commit c5a282e9635e ("fs/epoll: reduce the scope of wq lock in epoll_wait()") made some ep_events_available() calls lockless and added single call under a lock, finally commit e59d3c64cba6 ("epoll: eliminate unnecessary lock for zero timeout") made the last ep_events_available() lockless. BUG: KCSAN: data-race in do_epoll_wait / do_epoll_wait write to 0xffff88810480c7d8 of 8 bytes by task 1802 on cpu 0: INIT_LIST_HEAD include/linux/list.h:38 [inline] list_splice_init include/linux/list.h:492 [inline] ep_start_scan fs/eventpoll.c:622 [inline] ep_send_events fs/eventpoll.c:1656 [inline] ep_poll fs/eventpoll.c:1806 [inline] do_epoll_wait+0x4eb/0xf40 fs/eventpoll.c:2234 do_epoll_pwait fs/eventpoll.c:2268 [inline] __do_sys_epoll_pwait fs/eventpoll.c:2281 [inline] __se_sys_epoll_pwait+0x12b/0x240 fs/eventpoll.c:2275 __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2275 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88810480c7d8 of 8 bytes by task 1799 on cpu 1: list_empty_careful include/linux/list.h:329 [inline] ep_events_available fs/eventpoll.c:381 [inline] ep_poll fs/eventpoll.c:1797 [inline] do_epoll_wait+0x279/0xf40 fs/eventpoll.c:2234 do_epoll_pwait fs/eventpoll.c:2268 [inline] __do_sys_epoll_pwait fs/eventpoll.c:2281 [inline] __se_sys_epoll_pwait+0x12b/0x240 fs/eventpoll.c:2275 __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2275 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0xffff88810480c7d0 -> 0xffff888103c15098 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 1799 Comm: syz-fuzzer Tainted: G W 5.17.0-rc7-syzkaller-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5d5d993f16be15d124be7b8ec71b28ef7b7dc3afPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cb3e48f7a35033deb9455abe3932e63cb500b9ebPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d679ae94fdd5d3ab00c35078f5af5f37e068b03dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e039c0b5985999b150594126225e1ee51df7b4c9Patch
Impacted products
Vendor Product Version
Linux Linux Version: bf3b9f6372c45b0fbf24d86b8794910d20170017
Version: bf3b9f6372c45b0fbf24d86b8794910d20170017
Version: bf3b9f6372c45b0fbf24d86b8794910d20170017
Version: bf3b9f6372c45b0fbf24d86b8794910d20170017
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   Linux Linux Version: 4.12
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/list.h"
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          "vendor": "Linux",
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.17.*",
              "status": "unaffected",
              "version": "5.17.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "versionEndExcluding": "5.15.46",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
                },
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlist: fix a data-race around ep-\u003erdllist\n\nep_poll() first calls ep_events_available() with no lock held and checks\nif ep-\u003erdllist is empty by list_empty_careful(), which reads\nrdllist-\u003eprev.  Thus all accesses to it need some protection to avoid\nstore/load-tearing.\n\nNote INIT_LIST_HEAD_RCU() already has the annotation for both prev\nand next.\n\nCommit bf3b9f6372c4 (\"epoll: Add busy poll support to epoll with socket\nfds.\") added the first lockless ep_events_available(), and commit\nc5a282e9635e (\"fs/epoll: reduce the scope of wq lock in epoll_wait()\")\nmade some ep_events_available() calls lockless and added single call under\na lock, finally commit e59d3c64cba6 (\"epoll: eliminate unnecessary lock\nfor zero timeout\") made the last ep_events_available() lockless.\n\nBUG: KCSAN: data-race in do_epoll_wait / do_epoll_wait\n\nwrite to 0xffff88810480c7d8 of 8 bytes by task 1802 on cpu 0:\n INIT_LIST_HEAD include/linux/list.h:38 [inline]\n list_splice_init include/linux/list.h:492 [inline]\n ep_start_scan fs/eventpoll.c:622 [inline]\n ep_send_events fs/eventpoll.c:1656 [inline]\n ep_poll fs/eventpoll.c:1806 [inline]\n do_epoll_wait+0x4eb/0xf40 fs/eventpoll.c:2234\n do_epoll_pwait fs/eventpoll.c:2268 [inline]\n __do_sys_epoll_pwait fs/eventpoll.c:2281 [inline]\n __se_sys_epoll_pwait+0x12b/0x240 fs/eventpoll.c:2275\n __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2275\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nread to 0xffff88810480c7d8 of 8 bytes by task 1799 on cpu 1:\n list_empty_careful include/linux/list.h:329 [inline]\n ep_events_available fs/eventpoll.c:381 [inline]\n ep_poll fs/eventpoll.c:1797 [inline]\n do_epoll_wait+0x279/0xf40 fs/eventpoll.c:2234\n do_epoll_pwait fs/eventpoll.c:2268 [inline]\n __do_sys_epoll_pwait fs/eventpoll.c:2281 [inline]\n __se_sys_epoll_pwait+0x12b/0x240 fs/eventpoll.c:2275\n __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2275\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nvalue changed: 0xffff88810480c7d0 -\u003e 0xffff888103c15098\n\nReported by Kernel Concurrency Sanitizer on:\nCPU: 1 PID: 1799 Comm: syz-fuzzer Tainted: G        W         5.17.0-rc7-syzkaller-dirty #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T08:37:51.460Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5d5d993f16be15d124be7b8ec71b28ef7b7dc3af"
        },
        {
          "url": "https://git.kernel.org/stable/c/cb3e48f7a35033deb9455abe3932e63cb500b9eb"
        },
        {
          "url": "https://git.kernel.org/stable/c/e039c0b5985999b150594126225e1ee51df7b4c9"
        },
        {
          "url": "https://git.kernel.org/stable/c/d679ae94fdd5d3ab00c35078f5af5f37e068b03d"
        }
      ],
      "title": "list: fix a data-race around ep-\u003erdllist",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49443",
    "datePublished": "2025-02-26T02:12:55.959Z",
    "dateReserved": "2025-02-26T02:08:31.571Z",
    "dateUpdated": "2025-05-04T08:37:51.460Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49443\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-26T07:01:20.730\",\"lastModified\":\"2025-03-17T16:53:46.963\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nlist: fix a data-race around ep-\u003erdllist\\n\\nep_poll() first calls ep_events_available() with no lock held and checks\\nif ep-\u003erdllist is empty by list_empty_careful(), which reads\\nrdllist-\u003eprev.  Thus all accesses to it need some protection to avoid\\nstore/load-tearing.\\n\\nNote INIT_LIST_HEAD_RCU() already has the annotation for both prev\\nand next.\\n\\nCommit bf3b9f6372c4 (\\\"epoll: Add busy poll support to epoll with socket\\nfds.\\\") added the first lockless ep_events_available(), and commit\\nc5a282e9635e (\\\"fs/epoll: reduce the scope of wq lock in epoll_wait()\\\")\\nmade some ep_events_available() calls lockless and added single call under\\na lock, finally commit e59d3c64cba6 (\\\"epoll: eliminate unnecessary lock\\nfor zero timeout\\\") made the last ep_events_available() lockless.\\n\\nBUG: KCSAN: data-race in do_epoll_wait / do_epoll_wait\\n\\nwrite to 0xffff88810480c7d8 of 8 bytes by task 1802 on cpu 0:\\n INIT_LIST_HEAD include/linux/list.h:38 [inline]\\n list_splice_init include/linux/list.h:492 [inline]\\n ep_start_scan fs/eventpoll.c:622 [inline]\\n ep_send_events fs/eventpoll.c:1656 [inline]\\n ep_poll fs/eventpoll.c:1806 [inline]\\n do_epoll_wait+0x4eb/0xf40 fs/eventpoll.c:2234\\n do_epoll_pwait fs/eventpoll.c:2268 [inline]\\n __do_sys_epoll_pwait fs/eventpoll.c:2281 [inline]\\n __se_sys_epoll_pwait+0x12b/0x240 fs/eventpoll.c:2275\\n __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2275\\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\\n do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80\\n entry_SYSCALL_64_after_hwframe+0x44/0xae\\n\\nread to 0xffff88810480c7d8 of 8 bytes by task 1799 on cpu 1:\\n list_empty_careful include/linux/list.h:329 [inline]\\n ep_events_available fs/eventpoll.c:381 [inline]\\n ep_poll fs/eventpoll.c:1797 [inline]\\n do_epoll_wait+0x279/0xf40 fs/eventpoll.c:2234\\n do_epoll_pwait fs/eventpoll.c:2268 [inline]\\n __do_sys_epoll_pwait fs/eventpoll.c:2281 [inline]\\n __se_sys_epoll_pwait+0x12b/0x240 fs/eventpoll.c:2275\\n __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2275\\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\\n do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80\\n entry_SYSCALL_64_after_hwframe+0x44/0xae\\n\\nvalue changed: 0xffff88810480c7d0 -\u003e 0xffff888103c15098\\n\\nReported by Kernel Concurrency Sanitizer on:\\nCPU: 1 PID: 1799 Comm: syz-fuzzer Tainted: G        W         5.17.0-rc7-syzkaller-dirty #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: list: se corrige una ejecuci\u00f3n de datos alrededor de ep-\u0026gt;rdllist ep_poll() primero llama a ep_events_available() sin bloqueo mantenido y verifica si ep-\u0026gt;rdllist est\u00e1 vac\u00edo mediante list_empty_careful(), que lee rdllist-\u0026gt;prev. Por lo tanto, todos los accesos a \u00e9l necesitan alguna protecci\u00f3n para evitar el desgarro de almacenamiento/carga. Tenga en cuenta que INIT_LIST_HEAD_RCU() ya tiene la anotaci\u00f3n tanto para prev como para next. El commit bf3b9f6372c4 (\\\"epoll: Agregar soporte de sondeo ocupado a epoll con fds de socket\\\") agreg\u00f3 el primer ep_events_available() sin bloqueo, y el commit c5a282e9635e (\\\"fs/epoll: reducir el alcance del bloqueo wq en epoll_wait()\\\") hizo que algunas llamadas ep_events_available() no tuvieran bloqueo y agreg\u00f3 una sola llamada bajo un bloqueo, finalmente el commit e59d3c64cba6 (\\\"epoll: eliminar el bloqueo innecesario para tiempo de espera cero\\\") hizo que el \u00faltimo ep_events_available() no tuviera bloqueo. ERROR: KCSAN: data-race in do_epoll_wait / do_epoll_wait write to 0xffff88810480c7d8 of 8 bytes by task 1802 on cpu 0: INIT_LIST_HEAD include/linux/list.h:38 [inline] list_splice_init include/linux/list.h:492 [inline] ep_start_scan fs/eventpoll.c:622 [inline] ep_send_events fs/eventpoll.c:1656 [inline] ep_poll fs/eventpoll.c:1806 [inline] do_epoll_wait+0x4eb/0xf40 fs/eventpoll.c:2234 do_epoll_pwait fs/eventpoll.c:2268 [inline] __do_sys_epoll_pwait fs/eventpoll.c:2281 [inline] __se_sys_epoll_pwait+0x12b/0x240 fs/eventpoll.c:2275 __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2275 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88810480c7d8 of 8 bytes by task 1799 on cpu 1: list_empty_careful include/linux/list.h:329 [inline] ep_events_available fs/eventpoll.c:381 [inline] ep_poll fs/eventpoll.c:1797 [inline] do_epoll_wait+0x279/0xf40 fs/eventpoll.c:2234 do_epoll_pwait fs/eventpoll.c:2268 [inline] __do_sys_epoll_pwait fs/eventpoll.c:2281 [inline] __se_sys_epoll_pwait+0x12b/0x240 fs/eventpoll.c:2275 __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2275 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0xffff88810480c7d0 -\u0026gt; 0xffff888103c15098 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 1799 Comm: syz-fuzzer Tainted: G W 5.17.0-rc7-syzkaller-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 \"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-362\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.12\",\"versionEndExcluding\":\"5.15.46\",\"matchCriteriaId\":\"1C85B4FC-DF18-4C4C-AA30-7705B44192E5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"5.17.14\",\"matchCriteriaId\":\"15E2DD33-2255-4B76-9C15-04FF8CBAB252\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.18\",\"versionEndExcluding\":\"5.18.3\",\"matchCriteriaId\":\"8E122216-2E9E-4B3E-B7B8-D575A45BA3C2\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5d5d993f16be15d124be7b8ec71b28ef7b7dc3af\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cb3e48f7a35033deb9455abe3932e63cb500b9eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d679ae94fdd5d3ab00c35078f5af5f37e068b03d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e039c0b5985999b150594126225e1ee51df7b4c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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