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CVE-2022-48989

Estado: ModificadaMedia (4.7)—

In the Linux kernel, the following vulnerability has been resolved:

fscache: Fix oops due to race with cookie_lru and use_cookie

If a cookie expires from the LRU and the LRU_DISCARD flag is set, but the state machine has not run yet, it's possible another thread can call fscache_use_cookie and begin to use it.

When the cookie_worker finally runs, it will see the LRU_DISCARD flag set, transition the cookie->state to LRU_DISCARDING, which will then withdraw the cookie. Once the cookie is withdrawn the object is removed the below oops will occur because the object associated with the cookie is now NULL.

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Fix the oops by clearing the LRU_DISCARD bit if another thread uses the cookie before the cookie_worker runs.

Detalles técnicos trazas, registros y código del informe original
  BUG: kernel NULL pointer dereference, address: 0000000000000008
  ...
  CPU: 31 PID: 44773 Comm: kworker/u130:1 Tainted: G     E    6.0.0-5.dneg.x86_64 #1
  Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
  Workqueue: events_unbound netfs_rreq_write_to_cache_work [netfs]
  RIP: 0010:cachefiles_prepare_write+0x28/0x90 [cachefiles]
  ...
  Call Trace:
    netfs_rreq_write_to_cache_work+0x11c/0x320 [netfs]
    process_one_work+0x217/0x3e0
    worker_thread+0x4a/0x3b0
    kthread+0xd6/0x100

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2022-48989",
  "cveTags": [],
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2022-48989",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-10-22T13:16:49.876509Z"
        }
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        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "version": "3.1",
          "baseScore": 7.8,
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          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
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          "confidentialityImpact": "NONE"
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      "affectedData": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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              "version": "12bb21a29c19aae50cfad4e2bb5c943108f34a7d",
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          ],
          "programFiles": [
            "fs/fscache/cookie.c",
            "include/trace/events/fscache.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.17",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.0.13",
              "versionType": "semver",
              "lessThanOrEqual": "6.0.*"
            },
            {
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/fscache/cookie.c",
            "include/trace/events/fscache.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2024-10-21T20:15:10.820",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/37f0b459c9b67e14fe4dcc3a15d286c4436ed01d",
      "tags": [
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    },
    {
      "url": "https://git.kernel.org/stable/c/b5b52de3214a29911f949459a79f6640969b5487",
      "tags": [
        "Patch"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfscache: Fix oops due to race with cookie_lru and use_cookie\n\nIf a cookie expires from the LRU and the LRU_DISCARD flag is set, but\nthe state machine has not run yet, it's possible another thread can call\nfscache_use_cookie and begin to use it.\n\nWhen the cookie_worker finally runs, it will see the LRU_DISCARD flag\nset, transition the cookie->state to LRU_DISCARDING, which will then\nwithdraw the cookie.  Once the cookie is withdrawn the object is removed\nthe below oops will occur because the object associated with the cookie\nis now NULL.\n\nFix the oops by clearing the LRU_DISCARD bit if another thread uses the\ncookie before the cookie_worker runs.\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000008\n  ...\n  CPU: 31 PID: 44773 Comm: kworker/u130:1 Tainted: G     E    6.0.0-5.dneg.x86_64 #1\n  Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022\n  Workqueue: events_unbound netfs_rreq_write_to_cache_work [netfs]\n  RIP: 0010:cachefiles_prepare_write+0x28/0x90 [cachefiles]\n  ...\n  Call Trace:\n    netfs_rreq_write_to_cache_work+0x11c/0x320 [netfs]\n    process_one_work+0x217/0x3e0\n    worker_thread+0x4a/0x3b0\n    kthread+0xd6/0x100"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fscache: Corregir oops debido a ejecución con cookie_lru y use_cookie Si una cookie caduca desde la LRU y el indicador LRU_DISCARD está configurado, pero la máquina de estado aún no se ha ejecutado, es posible que otro hilo pueda llamar a fscache_use_cookie y comenzar a usarlo. Cuando finalmente se ejecuta cookie_worker, verá el indicador LRU_DISCARD configurado, hará la transición de cookie->state a LRU_DISCARDING, que luego retirará la cookie. Una vez que se retira la cookie, se elimina el objeto, se producirán los siguientes oops porque el objeto asociado con la cookie ahora es NULL. Corrija los oops borrando el bit LRU_DISCARD si otro hilo usa la cookie antes de que se ejecute cookie_worker. ERROR: desreferencia de puntero NULL del núcleo, dirección: 0000000000000008 ... CPU: 31 PID: 44773 Comm: kworker/u130:1 Contaminado: GE 6.0.0-5.dneg.x86_64 #1 Nombre del hardware: Google Compute Engine/Google Compute Engine, BIOS Google 26/08/2022 Cola de trabajo: events_unbound netfs_rreq_write_to_cache_work [netfs] RIP: 0010:cachefiles_prepare_write+0x28/0x90 [cachefiles] ... Seguimiento de llamadas: netfs_rreq_write_to_cache_work+0x11c/0x320 [netfs] process_one_work+0x217/0x3e0 worker_thread+0x4a/0x3b0 hilo+0xd6/0x100"
    }
  ],
  "lastModified": "2026-08-04T10:17:29.803",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "42D50790-F3F1-4BBF-8C57-2D40CE73EC80",
              "versionEndExcluding": "6.0.13",
              "versionStartIncluding": "5.17"
            },
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              "matchCriteriaId": "17F0B248-42CF-4AE6-A469-BB1BAE7F4705"
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}