cve-2024-49889
Vulnerability from cvelistv5
Published
2024-10-21 18:01
Modified
2024-12-19 09:28
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: avoid use-after-free in ext4_ext_show_leaf() In ext4_find_extent(), path may be freed by error or be reallocated, so using a previously saved *ppath may have been freed and thus may trigger use-after-free, as follows: ext4_split_extent path = *ppath; ext4_split_extent_at(ppath) path = ext4_find_extent(ppath) ext4_split_extent_at(ppath) // ext4_find_extent fails to free path // but zeroout succeeds ext4_ext_show_leaf(inode, path) eh = path[depth].p_hdr // path use-after-free !!! Similar to ext4_split_extent_at(), we use *ppath directly as an input to ext4_ext_show_leaf(). Fix a spelling error by the way. Same problem in ext4_ext_handle_unwritten_extents(). Since 'path' is only used in ext4_ext_show_leaf(), remove 'path' and use *ppath directly. This issue is triggered only when EXT_DEBUG is defined and therefore does not affect functionality.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2eba3b0cc5b8de624918d21f32b5b8db59a90b39Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/34b2096380ba475771971a778a478661a791aa15Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4999fed877bb64e3e7f9ab9996de2ca983c41928Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4e2524ba2ca5f54bdbb9e5153bea00421ef653f5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8b114f2cc7dd5d36729d040b68432fbd0f0a8868Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b0cb4561fc4284d04e69c8a66c8504928ab2484ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d483c7cc1796bd6a80e7b3a8fd494996260f6b67Patch
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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      datePublished: "2024-10-21T18:01:24.941Z",
      dateReserved: "2024-10-21T12:17:06.022Z",
      dateUpdated: "2024-12-19T09:28:26.269Z",
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Fix a spelling error by the way.\\n\\nSame problem in ext4_ext_handle_unwritten_extents(). Since 'path' is only\\nused in ext4_ext_show_leaf(), remove 'path' and use *ppath directly.\\n\\nThis issue is triggered only when EXT_DEBUG is defined and therefore does\\nnot affect functionality.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: evitar use after free en ext4_ext_show_leaf() En ext4_find_extent(), path puede liberarse por error o reasignarse, por lo que el uso de un *ppath previamente guardado puede haberse liberado y, por lo tanto, puede activar el use after free, de la siguiente manera: ext4_split_extent path = *ppath; ext4_split_extent_at(ppath) path = ext4_find_extent(ppath) ext4_split_extent_at(ppath) // ext4_find_extent no puede liberar path // pero la puesta a cero tiene éxito ext4_ext_show_leaf(inode, path) eh = path[depth].p_hdr // use after free de path !!! De manera similar a ext4_split_extent_at(), usamos *ppath directamente como entrada para ext4_ext_show_leaf(). Por cierto, corrige un error ortográfico. El mismo problema en ext4_ext_handle_unwritten_extents(). Dado que 'path' solo se usa en ext4_ext_show_leaf(), elimine 'path' y use *ppath directamente. 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      vulnrichment: {
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}


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  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.