fkie_cve-2022-48989
Vulnerability from fkie_nvd
Published
2024-10-21 20:15
Modified
2024-10-25 16:02
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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 Once the cookie is withdrawn the object is removed the below oops will occur because the object associated with the cookie is now NULL. Fix the oops by clearing the LRU_DISCARD bit if another thread uses the cookie before the cookie_worker runs. 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
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/37f0b459c9b67e14fe4dcc3a15d286c4436ed01dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b5b52de3214a29911f949459a79f6640969b5487Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1


To clipboard 

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  "cveTags": [],
  "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\u0027s 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-\u003estate 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 ejecuci\u00f3n con cookie_lru y use_cookie Si una cookie caduca desde la LRU y el indicador LRU_DISCARD est\u00e1 configurado, pero la m\u00e1quina de estado a\u00fan 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, ver\u00e1 el indicador LRU_DISCARD configurado, har\u00e1 la transici\u00f3n de cookie-\u0026gt;state a LRU_DISCARDING, que luego retirar\u00e1 la cookie. Una vez que se retira la cookie, se elimina el objeto, se producir\u00e1n 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 n\u00facleo, direcci\u00f3n: 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"
    }
  ],
  "id": "CVE-2022-48989",
  "lastModified": "2024-10-25T16:02:05.787",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2024-10-21T20:15:10.820",
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  "vulnStatus": "Analyzed",
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          "lang": "en",
          "value": "CWE-362"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
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}


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