{"id":"CVE-2024-56549","revision":"bea40a9774e64f13b496640c32111288","records":[{"revision":"bea40a9774e64f13b496640c32111288","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2024-56549","aliases":[],"title":"cachefiles: Fix NULL pointer dereference in object->file","description":"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.","state":0,"publishedAt":"2024-12-27T14:11:30.336+00:00","modifiedAt":"2026-10-15T21:41:47.066+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/cachefiles/interface.c\",\n                        \"fs/cachefiles/ondemand.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"c8383054506c77b814489c09877b5db83fd4abf2\",\n                            \"lessThan\": \"d6bba3ece960129a553d4b16f1b00c884dc0993a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c8383054506c77b814489c09877b5db83fd4abf2\",\n                            \"lessThan\": \"785408bbafcfa24c9fc5b251f03fd0780ce182bd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c8383054506c77b814489c09877b5db83fd4abf2\",\n                            \"lessThan\": \"f98770440c9bc468e2fd878212ec9526dbe08293\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c8383054506c77b814489c09877b5db83fd4abf2\",\n                            \"lessThan\": \"9582c7664103c9043e80a78f5c382aa6bdd67418\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c8383054506c77b814489c09877b5db83fd4abf2\",\n                            \"lessThan\": \"31ad74b20227ce6b40910ff78b1c604e42975cf1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/cachefiles/interface.c\",\n                        \"fs/cachefiles/ondemand.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.19\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.129\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.78\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.11.11\",\n                            \"lessThanOrEqual\": \"6.11.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.2\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.13\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/d6bba3ece960129a553d4b16f1b00c884dc0993a","https://git.kernel.org/stable/c/785408bbafcfa24c9fc5b251f03fd0780ce182bd","https://git.kernel.org/stable/c/f98770440c9bc468e2fd878212ec9526dbe08293","https://git.kernel.org/stable/c/9582c7664103c9043e80a78f5c382aa6bdd67418","https://git.kernel.org/stable/c/31ad74b20227ce6b40910ff78b1c604e42975cf1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-56549","license":"CVE Program Terms of Use","key":"cve-program:CVE-2024-56549","identifiers":["CVE-2024-56549"]},"retained":false,"historicalAffected":[]}],"coverage":[]}