FKIE_CVE-2024-39276

Vulnerability from fkie_nvd - Published: 2024-06-25 15:15 - Updated: 2026-06-17 07:41
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix mb_cache_entry's e_refcnt leak in ext4_xattr_block_cache_find() Syzbot reports a warning as follows: ============================================ WARNING: CPU: 0 PID: 5075 at fs/mbcache.c:419 mb_cache_destroy+0x224/0x290 Modules linked in: CPU: 0 PID: 5075 Comm: syz-executor199 Not tainted 6.9.0-rc6-gb947cc5bf6d7 RIP: 0010:mb_cache_destroy+0x224/0x290 fs/mbcache.c:419 Call Trace: <TASK> ext4_put_super+0x6d4/0xcd0 fs/ext4/super.c:1375 generic_shutdown_super+0x136/0x2d0 fs/super.c:641 kill_block_super+0x44/0x90 fs/super.c:1675 ext4_kill_sb+0x68/0xa0 fs/ext4/super.c:7327 [...] ============================================ This is because when finding an entry in ext4_xattr_block_cache_find(), if ext4_sb_bread() returns -ENOMEM, the ce's e_refcnt, which has already grown in the __entry_find(), won't be put away, and eventually trigger the above issue in mb_cache_destroy() due to reference count leakage. So call mb_cache_entry_put() on the -ENOMEM error branch as a quick fix.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0c0b4a49d3e7f49690a6827a41faeffad5df7e21Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/681ff9a09accd8a4379f8bd30b7a1641ee19bb3ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/76dc776153a47372719d664e0fc50d6355791abbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/896a7e7d0d555ad8b2b46af0c2fa7de7467f9483Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9ad75e78747b5a50dc5a52f0f8e92e920a653f16Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a95df6f04f2c37291adf26a74205cde0314d4577Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b37c0edef4e66fb21a2fbc211471195a383e5ab8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e941b712e758f615d311946bf98216e79145ccd9Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0c0b4a49d3e7f49690a6827a41faeffad5df7e21Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/681ff9a09accd8a4379f8bd30b7a1641ee19bb3ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/76dc776153a47372719d664e0fc50d6355791abbPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/896a7e7d0d555ad8b2b46af0c2fa7de7467f9483Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9ad75e78747b5a50dc5a52f0f8e92e920a653f16Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a95df6f04f2c37291adf26a74205cde0314d4577Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b37c0edef4e66fb21a2fbc211471195a383e5ab8Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e941b712e758f615d311946bf98216e79145ccd9Patch
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 *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/xattr.c"
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "5.0"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "4.19.316",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.4.278",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.10.219",
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              "status": "unaffected",
              "version": "5.15.161",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "6.9.5",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.10",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          "negate": false,
          "operator": "OR"
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      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix mb_cache_entry\u0027s e_refcnt leak in ext4_xattr_block_cache_find()\n\nSyzbot reports a warning as follows:\n\n============================================\nWARNING: CPU: 0 PID: 5075 at fs/mbcache.c:419 mb_cache_destroy+0x224/0x290\nModules linked in:\nCPU: 0 PID: 5075 Comm: syz-executor199 Not tainted 6.9.0-rc6-gb947cc5bf6d7\nRIP: 0010:mb_cache_destroy+0x224/0x290 fs/mbcache.c:419\nCall Trace:\n \u003cTASK\u003e\n ext4_put_super+0x6d4/0xcd0 fs/ext4/super.c:1375\n generic_shutdown_super+0x136/0x2d0 fs/super.c:641\n kill_block_super+0x44/0x90 fs/super.c:1675\n ext4_kill_sb+0x68/0xa0 fs/ext4/super.c:7327\n[...]\n============================================\n\nThis is because when finding an entry in ext4_xattr_block_cache_find(), if\next4_sb_bread() returns -ENOMEM, the ce\u0027s e_refcnt, which has already grown\nin the __entry_find(), won\u0027t be put away, and eventually trigger the above\nissue in mb_cache_destroy() due to reference count leakage.\n\nSo call mb_cache_entry_put() on the -ENOMEM error branch as a quick fix."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: soluciona la fuga de e_refcnt de mb_cache_entry en ext4_xattr_block_cache_find() Syzbot informa una advertencia de la siguiente manera: ======================= ======================= ADVERTENCIA: CPU: 0 PID: 5075 en fs/mbcache.c:419 mb_cache_destroy+0x224/0x290 M\u00f3dulos vinculados en: CPU: 0 PID: 5075 Comm: syz-executor199 No contaminado 6.9.0-rc6-gb947cc5bf6d7 RIP: 0010:mb_cache_destroy+0x224/0x290 fs/mbcache.c:419 Seguimiento de llamadas:  ext4_put_super+0x6d4/0xcd0 fs/ext4/super .c:1375 generic_shutdown_super+0x136/0x2d0 fs/super.c:641 kill_block_super+0x44/0x90 fs/super.c:1675 ext4_kill_sb+0x68/0xa0 fs/ext4/super.c:7327 [...] === ========================================= Esto se debe a que al encontrar una entrada en ext4_xattr_block_cache_find (), si ext4_sb_bread() devuelve -ENOMEM, el e_refcnt del ce, que ya ha crecido en __entry_find(), no se guardar\u00e1 y, eventualmente, desencadenar\u00e1 el problema anterior en mb_cache_destroy() debido a una fuga del recuento de referencias. Entonces llame a mb_cache_entry_put() en la rama de error -ENOMEM como soluci\u00f3n r\u00e1pida."
    }
  ],
  "id": "CVE-2024-39276",
  "lastModified": "2026-06-17T07:41:37.247",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-39276",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-06-25T15:26:44.344702Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-06-25T15:15:13.903",
  "references": [
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  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.