FKIE_CVE-2024-26704

Vulnerability from fkie_nvd - Published: 2024-04-03 15:15 - Updated: 2026-06-17 07:18
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: fix double-free of blocks due to wrong extents moved_len In ext4_move_extents(), moved_len is only updated when all moves are successfully executed, and only discards orig_inode and donor_inode preallocations when moved_len is not zero. When the loop fails to exit after successfully moving some extents, moved_len is not updated and remains at 0, so it does not discard the preallocations. If the moved extents overlap with the preallocated extents, the overlapped extents are freed twice in ext4_mb_release_inode_pa() and ext4_process_freed_data() (as described in commit 94d7c16cbbbd ("ext4: Fix double-free of blocks with EXT4_IOC_MOVE_EXT")), and bb_free is incremented twice. Hence when trim is executed, a zero-division bug is triggered in mb_update_avg_fragment_size() because bb_free is not zero and bb_fragments is zero. Therefore, update move_len after each extent move to avoid the issue.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/185eab30486ba3e7bf8b9c2e049c79a06ffd2bc1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2883940b19c38d5884c8626483811acf4d7e148fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/55583e899a5357308274601364741a83e78d6ac4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/559ddacb90da1d8786dd8ec4fd76bbfa404eaef6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/afba9d11320dad5ce222ac8964caf64b7b4bedb1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/afbcad9ae7d6d11608399188f03a837451b6b3a1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b4fbb89d722cbb16beaaea234b7230faaaf68c71Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d033a555d9a1cf53dbf3301af7199cc4a4c8f537Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/185eab30486ba3e7bf8b9c2e049c79a06ffd2bc1Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2883940b19c38d5884c8626483811acf4d7e148fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/55583e899a5357308274601364741a83e78d6ac4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/559ddacb90da1d8786dd8ec4fd76bbfa404eaef6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/afba9d11320dad5ce222ac8964caf64b7b4bedb1Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/afbcad9ae7d6d11608399188f03a837451b6b3a1Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b4fbb89d722cbb16beaaea234b7230faaaf68c71Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d033a555d9a1cf53dbf3301af7199cc4a4c8f537Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlMailing List
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlMailing List
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 *
linux linux_kernel 6.8
linux linux_kernel 6.8
debian debian_linux 10.0
To clipboard 

{
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix double-free of blocks due to wrong extents moved_len\n\nIn ext4_move_extents(), moved_len is only updated when all moves are\nsuccessfully executed, and only discards orig_inode and donor_inode\npreallocations when moved_len is not zero. When the loop fails to exit\nafter successfully moving some extents, moved_len is not updated and\nremains at 0, so it does not discard the preallocations.\n\nIf the moved extents overlap with the preallocated extents, the\noverlapped extents are freed twice in ext4_mb_release_inode_pa() and\next4_process_freed_data() (as described in commit 94d7c16cbbbd (\"ext4:\nFix double-free of blocks with EXT4_IOC_MOVE_EXT\")), and bb_free is\nincremented twice. Hence when trim is executed, a zero-division bug is\ntriggered in mb_update_avg_fragment_size() because bb_free is not zero\nand bb_fragments is zero.\n\nTherefore, update move_len after each extent move to avoid the issue."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: corrige la doble liberaci\u00f3n de bloques debido a extensiones incorrectas. moving_len En ext4_move_extents(), move_len solo se actualiza cuando todos los movimientos se ejecutan exitosamente y solo descarta las preasignaciones de orig_inode y donante_inode cuando se mueve_len no es cero. Cuando el bucle no sale despu\u00e9s de mover con \u00e9xito algunas extensiones, moving_len no se actualiza y permanece en 0, por lo que no descarta las asignaciones previas. Si las extensiones movidas se superponen con las extensiones preasignadas, las extensiones superpuestas se liberan dos veces en ext4_mb_release_inode_pa() y ext4_process_freed_data() (como se describe en el commit 94d7c16cbbbd (\"ext4: corrige la doble liberaci\u00f3n de bloques con EXT4_IOC_MOVE_EXT\")), y se incrementa bb_free dos veces. Por lo tanto, cuando se ejecuta trim, se activa un error de divisi\u00f3n cero en mb_update_avg_fragment_size() porque bb_free no es cero y bb_fragments es cero. Por lo tanto, actualice move_len despu\u00e9s de cada movimiento de extensi\u00f3n para evitar el problema."
    }
  ],
  "id": "CVE-2024-26704",
  "lastModified": "2026-06-17T07:18:08.273",
  "metrics": {
    "cvssMetricV31": [
      {
        "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"
      }
    ],
    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-26704",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-09-10T15:52:39.832740Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-04-03T15:15:53.193",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-415"
        }
      ],
      "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.