FKIE_CVE-2024-56619

Vulnerability from fkie_nvd - Published: 2024-12-27 15:15 - Updated: 2026-06-17 08:12
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: nilfs2: fix potential out-of-bounds memory access in nilfs_find_entry() Syzbot reported that when searching for records in a directory where the inode's i_size is corrupted and has a large value, memory access outside the folio/page range may occur, or a use-after-free bug may be detected if KASAN is enabled. This is because nilfs_last_byte(), which is called by nilfs_find_entry() and others to calculate the number of valid bytes of directory data in a page from i_size and the page index, loses the upper 32 bits of the 64-bit size information due to an inappropriate type of local variable to which the i_size value is assigned. This caused a large byte offset value due to underflow in the end address calculation in the calling nilfs_find_entry(), resulting in memory access that exceeds the folio/page size. Fix this issue by changing the type of the local variable causing the bit loss from "unsigned int" to "u64". The return value of nilfs_last_byte() is also of type "unsigned int", but it is truncated so as not to exceed PAGE_SIZE and no bit loss occurs, so no change is required.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/09d6d05579fd46e61abf6e457bb100ff11f3a9d3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/31f7b57a77d4c82a34ddcb6ff35b5aa577ef153ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/48eb6e7404948032bbe811c5affbe39f6b316951Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5af8366625182f01f6d8465c9a3210574673af57Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/985ebec4ab0a28bb5910c3b1481a40fbf7f9e61dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c3afea07477baccdbdec4483f8d5e59d42a3f67fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e3732102a9d638d8627d14fdf7b208462f0520e0Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/03/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 *
linux linux_kernel 6.13
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nilfs2/dir.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "2ba466d74ed74f073257f86e61519cb8f8f46184",
              "versionType": "git"
            },
            {
              "lessThan": "985ebec4ab0a28bb5910c3b1481a40fbf7f9e61d",
              "status": "affected",
              "version": "2ba466d74ed74f073257f86e61519cb8f8f46184",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nilfs2/dir.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.30"
            },
            {
              "lessThan": "2.6.30",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.287",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.231",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.174",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.66",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "5.4.287",
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              "vulnerable": true
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              "matchCriteriaId": "531ECA60-482F-48A9-924B-24405022FB0C",
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              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix potential out-of-bounds memory access in nilfs_find_entry()\n\nSyzbot reported that when searching for records in a directory where the\ninode\u0027s i_size is corrupted and has a large value, memory access outside\nthe folio/page range may occur, or a use-after-free bug may be detected if\nKASAN is enabled.\n\nThis is because nilfs_last_byte(), which is called by nilfs_find_entry()\nand others to calculate the number of valid bytes of directory data in a\npage from i_size and the page index, loses the upper 32 bits of the 64-bit\nsize information due to an inappropriate type of local variable to which\nthe i_size value is assigned.\n\nThis caused a large byte offset value due to underflow in the end address\ncalculation in the calling nilfs_find_entry(), resulting in memory access\nthat exceeds the folio/page size.\n\nFix this issue by changing the type of the local variable causing the bit\nloss from \"unsigned int\" to \"u64\".  The return value of nilfs_last_byte()\nis also of type \"unsigned int\", but it is truncated so as not to exceed\nPAGE_SIZE and no bit loss occurs, so no change is required."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nilfs2: se corrige un posible acceso a memoria fuera de los l\u00edmites en nilfs_find_entry() Syzbot inform\u00f3 que al buscar registros en un directorio donde el i_size del inodo est\u00e1 da\u00f1ado y tiene un valor grande, puede ocurrir un acceso a memoria fuera del rango de folio/p\u00e1gina, o puede detectarse un error de use-after-free si KASAN est\u00e1 habilitado. Esto se debe a que nilfs_last_byte(), que es llamado por nilfs_find_entry() y otros para calcular la cantidad de bytes v\u00e1lidos de datos de directorio en una p\u00e1gina a partir de i_size y el \u00edndice de p\u00e1gina, pierde los 32 bits superiores de la informaci\u00f3n de tama\u00f1o de 64 bits debido a un tipo inadecuado de variable local a la que se asigna el valor de i_size. Esto caus\u00f3 un valor de desplazamiento de bytes grande debido al desbordamiento en el c\u00e1lculo de la direcci\u00f3n final en la llamada nilfs_find_entry(), lo que result\u00f3 en un acceso a memoria que excede el tama\u00f1o de folio/p\u00e1gina. Solucione este problema cambiando el tipo de la variable local que causa la p\u00e9rdida de bits de \"unsigned int\" a \"u64\". El valor de retorno de nilfs_last_byte() tambi\u00e9n es del tipo \"unsigned int\", pero se trunca para no superar PAGE_SIZE y no se produce ninguna p\u00e9rdida de bits, por lo que no se requiere ning\u00fan cambio."
    }
  ],
  "id": "CVE-2024-56619",
  "lastModified": "2026-06-17T08:12:34.040",
  "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-56619",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-02-11T15:41:59.486282Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-12-27T15:15:21.437",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/09d6d05579fd46e61abf6e457bb100ff11f3a9d3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/31f7b57a77d4c82a34ddcb6ff35b5aa577ef153e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/48eb6e7404948032bbe811c5affbe39f6b316951"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/5af8366625182f01f6d8465c9a3210574673af57"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/985ebec4ab0a28bb5910c3b1481a40fbf7f9e61d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/c3afea07477baccdbdec4483f8d5e59d42a3f67f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/e3732102a9d638d8627d14fdf7b208462f0520e0"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}



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