fkie_cve-2024-49889
Vulnerability from fkie_nvd
Published
2024-10-21 18:15
Modified
2025-11-03 23:16
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

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  "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."
    }
  ],
  "id": "CVE-2024-49889",
  "lastModified": "2025-11-03T23:16:29.053",
  "metrics": {
    "cvssMetricV31": [
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  "published": "2024-10-21T18:15:11.513",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "CWE-416"
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      "source": "nvd@nist.gov",
      "type": "Primary"
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  ]
}


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