ghsa-rcg3-vwp6-7grp
Vulnerability from github
Published
2024-10-21 18:30
Modified
2024-10-25 15:31
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

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.

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{
   affected: [],
   aliases: [
      "CVE-2024-49889",
   ],
   database_specific: {
      cwe_ids: [
         "CWE-416",
      ],
      github_reviewed: false,
      github_reviewed_at: null,
      nvd_published_at: "2024-10-21T18:15:11Z",
      severity: "HIGH",
   },
   details: "In the Linux kernel, the following vulnerability has been resolved:\n\next4: avoid use-after-free in ext4_ext_show_leaf()\n\nIn ext4_find_extent(), path may be freed by error or be reallocated, so\nusing a previously saved *ppath may have been freed and thus may trigger\nuse-after-free, as follows:\n\next4_split_extent\n  path = *ppath;\n  ext4_split_extent_at(ppath)\n  path = ext4_find_extent(ppath)\n  ext4_split_extent_at(ppath)\n    // ext4_find_extent fails to free path\n    // but zeroout succeeds\n  ext4_ext_show_leaf(inode, path)\n    eh = path[depth].p_hdr\n    // path use-after-free !!!\n\nSimilar to ext4_split_extent_at(), we use *ppath directly as an input to\next4_ext_show_leaf(). 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.",
   id: "GHSA-rcg3-vwp6-7grp",
   modified: "2024-10-25T15:31:25Z",
   published: "2024-10-21T18:30:57Z",
   references: [
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2024-49889",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/2eba3b0cc5b8de624918d21f32b5b8db59a90b39",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/34b2096380ba475771971a778a478661a791aa15",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/4999fed877bb64e3e7f9ab9996de2ca983c41928",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/4e2524ba2ca5f54bdbb9e5153bea00421ef653f5",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/8b114f2cc7dd5d36729d040b68432fbd0f0a8868",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/b0cb4561fc4284d04e69c8a66c8504928ab2484e",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/d483c7cc1796bd6a80e7b3a8fd494996260f6b67",
      },
   ],
   schema_version: "1.4.0",
   severity: [
      {
         score: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
         type: "CVSS_V3",
      },
   ],
}


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