fkie_cve-2024-50273
Vulnerability from fkie_nvd
Published
2024-11-19 02:16
Modified
2024-11-27 15:58
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: reinitialize delayed ref list after deleting it from the list At insert_delayed_ref() if we need to update the action of an existing ref to BTRFS_DROP_DELAYED_REF, we delete the ref from its ref head's ref_add_list using list_del(), which leaves the ref's add_list member not reinitialized, as list_del() sets the next and prev members of the list to LIST_POISON1 and LIST_POISON2, respectively. If later we end up calling drop_delayed_ref() against the ref, which can happen during merging or when destroying delayed refs due to a transaction abort, we can trigger a crash since at drop_delayed_ref() we call list_empty() against the ref's add_list, which returns false since the list was not reinitialized after the list_del() and as a consequence we call list_del() again at drop_delayed_ref(). This results in an invalid list access since the next and prev members are set to poison pointers, resulting in a splat if CONFIG_LIST_HARDENED and CONFIG_DEBUG_LIST are set or invalid poison pointer dereferences otherwise. So fix this by deleting from the list with list_del_init() instead.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2cb1a73d1d44a1c11b0ee5eeced765dd80ec48e6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2fd0948a483e9cb2d669c7199bc620a21c97673dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/50a3933760b427759afdd23156a7280a19357a92Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/93c5b8decc0ef39ba84f4211d2db6da0a4aefbebPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bf0b0c6d159767c0d1c21f793950d78486690ee0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c24fa427fc0ae827b2a3a07f13738cbf82c3f851Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c9a75ec45f1111ef530ab186c2a7684d0a0c9245Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f04be6d68f715c1473a8422fc0460f57b5e99931Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.12
linux linux_kernel 6.12
linux linux_kernel 6.12
linux linux_kernel 6.12
linux linux_kernel 6.12
linux linux_kernel 6.12


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{
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         nodes: [
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   cveTags: [],
   descriptions: [
      {
         lang: "en",
         value: "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: reinitialize delayed ref list after deleting it from the list\n\nAt insert_delayed_ref() if we need to update the action of an existing\nref to BTRFS_DROP_DELAYED_REF, we delete the ref from its ref head's\nref_add_list using list_del(), which leaves the ref's add_list member\nnot reinitialized, as list_del() sets the next and prev members of the\nlist to LIST_POISON1 and LIST_POISON2, respectively.\n\nIf later we end up calling drop_delayed_ref() against the ref, which can\nhappen during merging or when destroying delayed refs due to a transaction\nabort, we can trigger a crash since at drop_delayed_ref() we call\nlist_empty() against the ref's add_list, which returns false since\nthe list was not reinitialized after the list_del() and as a consequence\nwe call list_del() again at drop_delayed_ref(). This results in an\ninvalid list access since the next and prev members are set to poison\npointers, resulting in a splat if CONFIG_LIST_HARDENED and\nCONFIG_DEBUG_LIST are set or invalid poison pointer dereferences\notherwise.\n\nSo fix this by deleting from the list with list_del_init() instead.",
      },
      {
         lang: "es",
         value: "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: reinicializar la lista de referencias retrasadas después de eliminarla de la lista En insert_delayed_ref(), si necesitamos actualizar la acción de una referencia existente a BTRFS_DROP_DELAYED_REF, eliminamos la referencia de ref_add_list de su cabecera de referencia usando list_del(), lo que deja el miembro add_list de la referencia sin reinicializar, ya que list_del() establece los miembros siguiente y anterior de la lista en LIST_POISON1 y LIST_POISON2, respectivamente. Si más tarde terminamos llamando a drop_delayed_ref() contra la referencia, lo que puede suceder durante la fusión o al destruir referencias retrasadas debido a un aborto de transacción, podemos provocar un bloqueo ya que en drop_delayed_ref() llamamos a list_empty() contra el add_list de la referencia, que devuelve falso ya que la lista no se reinicializó después de list_del() y, como consecuencia, llamamos a list_del() nuevamente en drop_delayed_ref(). Esto da como resultado un acceso a la lista no válido ya que los miembros next y prev están configurados como punteros envenenados, lo que resulta en un splat si CONFIG_LIST_HARDENED y CONFIG_DEBUG_LIST están configurados o desreferencias de punteros envenenados no válidas en caso contrario. Así que solucione esto eliminando de la lista con list_del_init() en su lugar.",
      },
   ],
   id: "CVE-2024-50273",
   lastModified: "2024-11-27T15:58:02.730",
   metrics: {
      cvssMetricV31: [
         {
            cvssData: {
               attackComplexity: "LOW",
               attackVector: "LOCAL",
               availabilityImpact: "HIGH",
               baseScore: 5.5,
               baseSeverity: "MEDIUM",
               confidentialityImpact: "NONE",
               integrityImpact: "NONE",
               privilegesRequired: "LOW",
               scope: "UNCHANGED",
               userInteraction: "NONE",
               vectorString: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
               version: "3.1",
            },
            exploitabilityScore: 1.8,
            impactScore: 3.6,
            source: "nvd@nist.gov",
            type: "Primary",
         },
      ],
   },
   published: "2024-11-19T02:16:29.483",
   references: [
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/2cb1a73d1d44a1c11b0ee5eeced765dd80ec48e6",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
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         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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         url: "https://git.kernel.org/stable/c/c24fa427fc0ae827b2a3a07f13738cbf82c3f851",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
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         url: "https://git.kernel.org/stable/c/c9a75ec45f1111ef530ab186c2a7684d0a0c9245",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
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         url: "https://git.kernel.org/stable/c/f04be6d68f715c1473a8422fc0460f57b5e99931",
      },
   ],
   sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
   vulnStatus: "Analyzed",
   weaknesses: [
      {
         description: [
            {
               lang: "en",
               value: "CWE-908",
            },
         ],
         source: "nvd@nist.gov",
         type: "Primary",
      },
   ],
}


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