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
Show details on NVD website

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                "id": "CVE-2024-49889",
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          "value": "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 \u0027path\u0027 is only\nused in ext4_ext_show_leaf(), remove \u0027path\u0027 and use *ppath directly.\n\nThis issue is triggered only when EXT_DEBUG is defined and therefore does\nnot affect functionality."
        }
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    "cveId": "CVE-2024-49889",
    "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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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-49889\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T18:15:11.513\",\"lastModified\":\"2024-10-25T14:37:34.400\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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 \u0027path\u0027 is only\\nused in ext4_ext_show_leaf(), remove \u0027path\u0027 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 \u00e9xito 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 ortogr\u00e1fico. El mismo problema en ext4_ext_handle_unwritten_extents(). Dado que \u0027path\u0027 solo se usa en ext4_ext_show_leaf(), elimine \u0027path\u0027 y use *ppath directamente. Este problema se activa solo cuando se define EXT_DEBUG y, por lo tanto, no afecta la funcionalidad.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"5.10.227\",\"matchCriteriaId\":\"EB525A44-6338-4857-AD90-EA2860D1AD1F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.168\",\"matchCriteriaId\":\"4D51C05D-455B-4D8D-89E7-A58E140B864C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.113\",\"matchCriteriaId\":\"D01BD22E-ACD1-4618-9D01-6116570BE1EE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.55\",\"matchCriteriaId\":\"E90B9576-56C4-47BC-AAB0-C5B2D438F5D0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.14\",\"matchCriteriaId\":\"4C16BCE0-FFA0-4599-BE0A-1FD65101C021\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.11\",\"versionEndExcluding\":\"6.11.3\",\"matchCriteriaId\":\"54D9C704-D679-41A7-9C40-10A6B1E7FFE9\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2eba3b0cc5b8de624918d21f32b5b8db59a90b39\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/34b2096380ba475771971a778a478661a791aa15\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4999fed877bb64e3e7f9ab9996de2ca983c41928\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4e2524ba2ca5f54bdbb9e5153bea00421ef653f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8b114f2cc7dd5d36729d040b68432fbd0f0a8868\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b0cb4561fc4284d04e69c8a66c8504928ab2484e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d483c7cc1796bd6a80e7b3a8fd494996260f6b67\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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