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CVE-2024-56619 (GCVE-0-2024-56619)

Vulnerability from cvelistv5 – Published: 2024-12-27 14:51 – Updated: 2026-08-05 11:45
VLAI
Title
nilfs2: fix potential out-of-bounds memory access in nilfs_find_entry()
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-11 15:41 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2ba466d74ed74f073257f86e61519cb8f8f46184 , < 09d6d05579fd46e61abf6e457bb100ff11f3a9d3 (git)
Affected: 2ba466d74ed74f073257f86e61519cb8f8f46184 , < e3732102a9d638d8627d14fdf7b208462f0520e0 (git)
Affected: 2ba466d74ed74f073257f86e61519cb8f8f46184 , < 48eb6e7404948032bbe811c5affbe39f6b316951 (git)
Affected: 2ba466d74ed74f073257f86e61519cb8f8f46184 , < 5af8366625182f01f6d8465c9a3210574673af57 (git)
Affected: 2ba466d74ed74f073257f86e61519cb8f8f46184 , < c3afea07477baccdbdec4483f8d5e59d42a3f67f (git)
Affected: 2ba466d74ed74f073257f86e61519cb8f8f46184 , < 31f7b57a77d4c82a34ddcb6ff35b5aa577ef153e (git)
Affected: 2ba466d74ed74f073257f86e61519cb8f8f46184 , < 985ebec4ab0a28bb5910c3b1481a40fbf7f9e61d (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 5.4.287 , ≤ 5.4.* (semver)
Unaffected: 5.10.231 , ≤ 5.10.* (semver)
Unaffected: 5.15.174 , ≤ 5.15.* (semver)
Unaffected: 6.1.120 , ≤ 6.1.* (semver)
Unaffected: 6.6.66 , ≤ 6.6.* (semver)
Unaffected: 6.12.5 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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            "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": [
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          {
            "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": [
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              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2025-11-21T11:18:15+00:00",
      "cve": "CVE-2024-56619",
      "id": "CVE-2024-56619",
      "initial_release_date": "2024-12-27T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nilfs2: fix potential out-of-bounds memory access in nilfs_find_entry()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-56619.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2025-11-03T20:51:08.191Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
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                "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
              },
              {
                "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
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                  "attackComplexity": "LOW",
                  "attackVector": "LOCAL",
                  "availabilityImpact": "HIGH",
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                  "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"
                }
              },
              {
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                  "content": {
                    "id": "CVE-2024-56619",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-02-11T15:41:59.486282Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-416",
                    "description": "CWE-416 Use After Free",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-02-11T15:42:01.033Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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              "product": "Linux",
              "programFiles": [
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              "vendor": "Linux",
              "versions": [
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                  "version": "2.6.30"
                },
                {
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                  "version": "0",
                  "versionType": "semver"
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                  "version": "5.4.287",
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                  "version": "5.15.174",
                  "versionType": "semver"
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                  "version": "6.1.120",
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                  "version": "6.6.66",
                  "versionType": "semver"
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                  "version": "6.12.5",
                  "versionType": "semver"
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                  "versionType": "original_commit_for_fix"
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                      "vulnerable": true
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            }
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              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The vulnerability is triggered through local filesystem operations (lookup, unlink, rename, getdents) on a mounted nilfs2 image with a corrupted directory i_size; no network protocol handler is involved.\nAC:L - The truncation and subsequent unsigned underflow are fully deterministic once the crafted i_size is present \u2014 a single lookup or readdir on the directory reliably walks past the folio, with no race or unpredictable precondition.\nPR:L - An unprivileged local user can supply and mount a crafted nilfs2 image via removable-media automount (udisks2) and then trigger the OOB with ordinary directory operations; no elevated capability is needed for the triggering syscalls.\nUI:N - Once the attacker-controlled filesystem is mounted, the attacker triggers the flaw entirely on their own with a lookup/readdir/unlink; no separate victim action is required.\nS:U - The out-of-bounds access and its consequences remain within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - nilfs_readdir() emits names and inode numbers read from out-of-bounds kernel memory directly to userspace via dir_emit(), giving a repeatable kernel heap disclosure primitive.\nI:H - A name match in out-of-bounds memory lets nilfs_delete_entry() write dir-\u003einode = 0 and pde-\u003erec_len at an attacker-groomable location outside the folio, an out-of-bounds write usable for control-flow corruption.\nA:H - The unbounded ~4 GB scan limit causes access past the folio into unmapped memory, producing a kernel oops/panic (and KASAN use-after-free reports), as observed by syzbot."
                }
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              "url": "https://git.kernel.org/stable/c/985ebec4ab0a28bb5910c3b1481a40fbf7f9e61d"
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  }
}



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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

Author Source Type Date Other

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.