cve-2024-56549
Vulnerability from cvelistv5
Published
2024-12-27 14:11
Modified
2025-02-21 13:45
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/31ad74b20227ce6b40910ff78b1c604e42975cf1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/785408bbafcfa24c9fc5b251f03fd0780ce182bd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9582c7664103c9043e80a78f5c382aa6bdd67418Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d6bba3ece960129a553d4b16f1b00c884dc0993a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f98770440c9bc468e2fd878212ec9526dbe08293Patch
Impacted products
Vendor Product Version
Linux Linux Version: c8383054506c77b814489c09877b5db83fd4abf2
Version: c8383054506c77b814489c09877b5db83fd4abf2
Version: c8383054506c77b814489c09877b5db83fd4abf2
Version: c8383054506c77b814489c09877b5db83fd4abf2
Version: c8383054506c77b814489c09877b5db83fd4abf2
 Create a notification for this product.
   Linux Linux Version: 5.19
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
   containers: {
      cna: {
         affected: [
            {
               defaultStatus: "unaffected",
               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: [
                  {
                     lessThan: "d6bba3ece960129a553d4b16f1b00c884dc0993a",
                     status: "affected",
                     version: "c8383054506c77b814489c09877b5db83fd4abf2",
                     versionType: "git",
                  },
                  {
                     lessThan: "785408bbafcfa24c9fc5b251f03fd0780ce182bd",
                     status: "affected",
                     version: "c8383054506c77b814489c09877b5db83fd4abf2",
                     versionType: "git",
                  },
                  {
                     lessThan: "f98770440c9bc468e2fd878212ec9526dbe08293",
                     status: "affected",
                     version: "c8383054506c77b814489c09877b5db83fd4abf2",
                     versionType: "git",
                  },
                  {
                     lessThan: "9582c7664103c9043e80a78f5c382aa6bdd67418",
                     status: "affected",
                     version: "c8383054506c77b814489c09877b5db83fd4abf2",
                     versionType: "git",
                  },
                  {
                     lessThan: "31ad74b20227ce6b40910ff78b1c604e42975cf1",
                     status: "affected",
                     version: "c8383054506c77b814489c09877b5db83fd4abf2",
                     versionType: "git",
                  },
               ],
            },
            {
               defaultStatus: "affected",
               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: [
                  {
                     status: "affected",
                     version: "5.19",
                  },
                  {
                     lessThan: "5.19",
                     status: "unaffected",
                     version: "0",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.1.*",
                     status: "unaffected",
                     version: "6.1.129",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.6.*",
                     status: "unaffected",
                     version: "6.6.78",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.11.*",
                     status: "unaffected",
                     version: "6.11.11",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "6.12.*",
                     status: "unaffected",
                     version: "6.12.2",
                     versionType: "semver",
                  },
                  {
                     lessThanOrEqual: "*",
                     status: "unaffected",
                     version: "6.13",
                     versionType: "original_commit_for_fix",
                  },
               ],
            },
         ],
         descriptions: [
            {
               lang: "en",
               value: "In the Linux kernel, the following vulnerability has been resolved:\n\ncachefiles: Fix NULL pointer dereference in object->file\n\nAt present, the object->file has the NULL pointer dereference problem in\nondemand-mode. The root cause is that the allocated fd and object->file\nlifetime are inconsistent, and the user-space invocation to anon_fd uses\nobject->file. 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->file)\n\t\t\t\t\t     object->file = NULL\n  // file NULL pointer dereference!\n  __cachefiles_write(..., file, ...)\n\nFix this issue by add an additional reference count to the object->file\nbefore write/llseek, and decrement after it finished.",
            },
         ],
         providerMetadata: {
            dateUpdated: "2025-02-21T13:45:16.623Z",
            orgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            shortName: "Linux",
         },
         references: [
            {
               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->file",
         x_generator: {
            engine: "bippy-5f407fcff5a0",
         },
      },
   },
   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: "2025-02-21T13:45:16.623Z",
      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->file\\n\\nAt present, the object->file has the NULL pointer dereference problem in\\nondemand-mode. The root cause is that the allocated fd and object->file\\nlifetime are inconsistent, and the user-space invocation to anon_fd uses\\nobject->file. 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->file)\\n\\t\\t\\t\\t\\t     object->file = NULL\\n  // file NULL pointer dereference!\\n  __cachefiles_write(..., file, ...)\\n\\nFix this issue by add an additional reference count to the object->file\\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->file En la actualidad, object->file tiene el problema de desreferencia de puntero NULL en el modo ondemand. La causa raíz es que el fd asignado y el tiempo de vida de object->file son inconsistentes, y la invocación del espacio de usuario a anon_fd usa object->file. A continuación, 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->file) object->file = NULL // file ¡Desreferencia de puntero NULL! __cachefiles_write(..., file, ...) Solucione este problema agregando un recuento de referencia adicional al objeto->archivo antes de escribir/llseek, y disminuya después 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\"]}]}}",
   },
}


Log in or create an account to share your comment.

Security Advisory comment format.

This schema specifies the format of a comment related to a security advisory.

UUIDv4 of the comment
UUIDv4 of the Vulnerability-Lookup instance
When the comment was created originally
When the comment was last updated
Title of the comment
Description of the comment
The identifier of the vulnerability (CVE ID, GHSA-ID, PYSEC ID, etc.).



Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.