CVE-2024-56549 (GCVE-0-2024-56549)
Vulnerability from cvelistv5
Published
2024-12-27 14:11
Modified
2025-05-04 09:58
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: cachefiles: Fix NULL pointer dereference in object->file At present, the object->file has the NULL pointer dereference problem in ondemand-mode. The root cause is that the allocated fd and object->file lifetime are inconsistent, and the user-space invocation to anon_fd uses object->file. Following is the process that triggers the issue: [write fd] [umount] cachefiles_ondemand_fd_write_iter fscache_cookie_state_machine cachefiles_withdraw_cookie if (!file) return -ENOBUFS cachefiles_clean_up_object cachefiles_unmark_inode_in_use fput(object->file) object->file = NULL // file NULL pointer dereference! __cachefiles_write(..., file, ...) Fix this issue by add an additional reference count to the object->file before write/llseek, and decrement after it finished.
References
Impacted products
Vendor Product Version
Linux Linux Version: c8383054506c77b814489c09877b5db83fd4abf2
Version: c8383054506c77b814489c09877b5db83fd4abf2
Version: c8383054506c77b814489c09877b5db83fd4abf2
Version: c8383054506c77b814489c09877b5db83fd4abf2
Version: c8383054506c77b814489c09877b5db83fd4abf2
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/cachefiles/interface.c",
            "fs/cachefiles/ondemand.c"
          ],
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          "product": "Linux",
          "programFiles": [
            "fs/cachefiles/interface.c",
            "fs/cachefiles/ondemand.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            },
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              "version": "0",
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              "status": "unaffected",
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              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.11.11",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncachefiles: Fix NULL pointer dereference in object-\u003efile\n\nAt present, the object-\u003efile has the NULL pointer dereference problem in\nondemand-mode. The root cause is that the allocated fd and object-\u003efile\nlifetime are inconsistent, and the user-space invocation to anon_fd uses\nobject-\u003efile. Following is the process that triggers the issue:\n\n\t  [write fd]\t\t\t\t[umount]\ncachefiles_ondemand_fd_write_iter\n\t\t\t\t       fscache_cookie_state_machine\n\t\t\t\t\t cachefiles_withdraw_cookie\n  if (!file) return -ENOBUFS\n\t\t\t\t\t   cachefiles_clean_up_object\n\t\t\t\t\t     cachefiles_unmark_inode_in_use\n\t\t\t\t\t     fput(object-\u003efile)\n\t\t\t\t\t     object-\u003efile = NULL\n  // file NULL pointer dereference!\n  __cachefiles_write(..., file, ...)\n\nFix this issue by add an additional reference count to the object-\u003efile\nbefore write/llseek, and decrement after it finished."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T09:58:05.639Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/d6bba3ece960129a553d4b16f1b00c884dc0993a"
        },
        {
          "url": "https://git.kernel.org/stable/c/785408bbafcfa24c9fc5b251f03fd0780ce182bd"
        },
        {
          "url": "https://git.kernel.org/stable/c/f98770440c9bc468e2fd878212ec9526dbe08293"
        },
        {
          "url": "https://git.kernel.org/stable/c/9582c7664103c9043e80a78f5c382aa6bdd67418"
        },
        {
          "url": "https://git.kernel.org/stable/c/31ad74b20227ce6b40910ff78b1c604e42975cf1"
        }
      ],
      "title": "cachefiles: Fix NULL pointer dereference in object-\u003efile",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-56549",
    "datePublished": "2024-12-27T14:11:30.336Z",
    "dateReserved": "2024-12-27T14:03:05.989Z",
    "dateUpdated": "2025-05-04T09:58:05.639Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-56549\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-27T14:15:34.747\",\"lastModified\":\"2025-02-21T14:15:50.947\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncachefiles: Fix NULL pointer dereference in object-\u003efile\\n\\nAt present, the object-\u003efile has the NULL pointer dereference problem in\\nondemand-mode. The root cause is that the allocated fd and object-\u003efile\\nlifetime are inconsistent, and the user-space invocation to anon_fd uses\\nobject-\u003efile. Following is the process that triggers the issue:\\n\\n\\t  [write fd]\\t\\t\\t\\t[umount]\\ncachefiles_ondemand_fd_write_iter\\n\\t\\t\\t\\t       fscache_cookie_state_machine\\n\\t\\t\\t\\t\\t cachefiles_withdraw_cookie\\n  if (!file) return -ENOBUFS\\n\\t\\t\\t\\t\\t   cachefiles_clean_up_object\\n\\t\\t\\t\\t\\t     cachefiles_unmark_inode_in_use\\n\\t\\t\\t\\t\\t     fput(object-\u003efile)\\n\\t\\t\\t\\t\\t     object-\u003efile = NULL\\n  // file NULL pointer dereference!\\n  __cachefiles_write(..., file, ...)\\n\\nFix this issue by add an additional reference count to the object-\u003efile\\nbefore write/llseek, and decrement after it finished.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cachefiles: Arreglar la desreferencia de puntero NULL en object-\u0026gt;file En la actualidad, object-\u0026gt;file tiene el problema de desreferencia de puntero NULL en el modo ondemand. La causa ra\u00edz es que el fd asignado y el tiempo de vida de object-\u0026gt;file son inconsistentes, y la invocaci\u00f3n del espacio de usuario a anon_fd usa object-\u0026gt;file. A continuaci\u00f3n, se muestra el proceso que desencadena el problema: [write fd] [umount] cachefiles_ondemand_fd_write_iter fscache_cookie_state_machine cachefiles_withdraw_cookie if (!file) return -ENOBUFS cachefiles_clean_up_object cachefiles_unmark_inode_in_use fput(object-\u0026gt;file) object-\u0026gt;file = NULL // file \u00a1Desreferencia de puntero NULL! __cachefiles_write(..., file, ...) Solucione este problema agregando un recuento de referencia adicional al objeto-\u0026gt;archivo antes de escribir/llseek, y disminuya despu\u00e9s de que finalice.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.19\",\"versionEndExcluding\":\"6.11.11\",\"matchCriteriaId\":\"A482F6D5-4DB0-4611-AF23-1D568CE9F2BF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.12\",\"versionEndExcluding\":\"6.12.2\",\"matchCriteriaId\":\"D8882B1B-2ABC-4838-AC1D-DBDBB5764776\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/31ad74b20227ce6b40910ff78b1c604e42975cf1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/785408bbafcfa24c9fc5b251f03fd0780ce182bd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9582c7664103c9043e80a78f5c382aa6bdd67418\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d6bba3ece960129a553d4b16f1b00c884dc0993a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f98770440c9bc468e2fd878212ec9526dbe08293\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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