{"id":"CVE-2024-26840","state":"PUBLISHED","title":"cachefiles: fix memory leak in cachefiles_add_cache()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncachefiles: fix memory leak in cachefiles_add_cache()\n\nThe following memory leak was reported after unbinding /dev/cachefiles:\n\n==================================================================\nunreferenced object 0xffff9b674176e3c0 (size 192):\n  comm \"cachefilesd2\", pid 680, jiffies 4294881224\n  hex dump (first 32 bytes):\n    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace (crc ea38a44b):\n    [<ffffffff8eb8a1a5>] kmem_cache_alloc+0x2d5/0x370\n    [<ffffffff8e917f86>] prepare_creds+0x26/0x2e0\n    [<ffffffffc002eeef>] cachefiles_determine_cache_security+0x1f/0x120\n    [<ffffffffc00243ec>] cachefiles_add_cache+0x13c/0x3a0\n    [<ffffffffc0025216>] cachefiles_daemon_write+0x146/0x1c0\n    [<ffffffff8ebc4a3b>] vfs_write+0xcb/0x520\n    [<ffffffff8ebc5069>] ksys_write+0x69/0xf0\n    [<ffffffff8f6d4662>] do_syscall_64+0x72/0x140\n    [<ffffffff8f8000aa>] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n==================================================================\n\nPut the reference count of cache_cred in cachefiles_daemon_unbind() to\nfix the problem. And also put cache_cred in cachefiles_add_cache() error\nbranch to avoid memory leaks.","publishedAt":"2024-04-17T10:10:06.180Z","updatedAt":"2026-05-11T20:05:09.433Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9ae326a69004dea8af2dae4fde58de27db700a8d","status":"affected","lessThan":"cb5466783793e66272624cf71925ae1d1ba32083","versionType":"git"},{"version":"9ae326a69004dea8af2dae4fde58de27db700a8d","status":"affected","lessThan":"037d5a949b0455540ef9aab34c10ddf54b65d285","versionType":"git"},{"version":"9ae326a69004dea8af2dae4fde58de27db700a8d","status":"affected","lessThan":"43eccc5823732ba6daab2511ed32dfc545a666d8","versionType":"git"},{"version":"9ae326a69004dea8af2dae4fde58de27db700a8d","status":"affected","lessThan":"94965be37add0983672e48ecb33cdbda92b62579","versionType":"git"},{"version":"9ae326a69004dea8af2dae4fde58de27db700a8d","status":"affected","lessThan":"8b218e2f0a27a9f09428b1847b4580640b9d1e58","versionType":"git"},{"version":"9ae326a69004dea8af2dae4fde58de27db700a8d","status":"affected","lessThan":"38e921616320d159336b0ffadb09e9fb4945c7c3","versionType":"git"},{"version":"9ae326a69004dea8af2dae4fde58de27db700a8d","status":"affected","lessThan":"9cac69912052a4def571fedf1cb9bb4ec590e25a","versionType":"git"},{"version":"9ae326a69004dea8af2dae4fde58de27db700a8d","status":"affected","lessThan":"e21a2f17566cbd64926fb8f16323972f7a064444","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/cachefiles/cache.c","fs/cachefiles/daemon.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.30","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.30","versionType":"semver"},{"version":"4.19.309","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.271","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.212","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.151","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.80","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.19","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.7","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/cachefiles/cache.c","fs/cachefiles/daemon.c"]}],"references":["https://git.kernel.org/stable/c/cb5466783793e66272624cf71925ae1d1ba32083","https://git.kernel.org/stable/c/037d5a949b0455540ef9aab34c10ddf54b65d285","https://git.kernel.org/stable/c/43eccc5823732ba6daab2511ed32dfc545a666d8","https://git.kernel.org/stable/c/94965be37add0983672e48ecb33cdbda92b62579","https://git.kernel.org/stable/c/8b218e2f0a27a9f09428b1847b4580640b9d1e58","https://git.kernel.org/stable/c/38e921616320d159336b0ffadb09e9fb4945c7c3","https://git.kernel.org/stable/c/9cac69912052a4def571fedf1cb9bb4ec590e25a","https://git.kernel.org/stable/c/e21a2f17566cbd64926fb8f16323972f7a064444","https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html","https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:07:10.607Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/26xxx/CVE-2024-26840.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-26840","state":"PUBLISHED","datePublished":"2024-04-17T10:10:06.180Z","dateUpdated":"2026-05-11T20:05:09.433Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-02-19T14:20:24.182Z"},"containers":{"cna":{"title":"cachefiles: fix memory leak in cachefiles_add_cache()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncachefiles: fix memory leak in cachefiles_add_cache()\n\nThe following memory leak was reported after unbinding /dev/cachefiles:\n\n==================================================================\nunreferenced object 0xffff9b674176e3c0 (size 192):\n  comm \"cachefilesd2\", pid 680, jiffies 4294881224\n  hex dump (first 32 bytes):\n    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace (crc ea38a44b):\n    [<ffffffff8eb8a1a5>] kmem_cache_alloc+0x2d5/0x370\n    [<ffffffff8e917f86>] prepare_creds+0x26/0x2e0\n    [<ffffffffc002eeef>] cachefiles_determine_cache_security+0x1f/0x120\n    [<ffffffffc00243ec>] cachefiles_add_cache+0x13c/0x3a0\n    [<ffffffffc0025216>] cachefiles_daemon_write+0x146/0x1c0\n    [<ffffffff8ebc4a3b>] vfs_write+0xcb/0x520\n    [<ffffffff8ebc5069>] ksys_write+0x69/0xf0\n    [<ffffffff8f6d4662>] do_syscall_64+0x72/0x140\n    [<ffffffff8f8000aa>] entry_SYSCALL_64_after_hwframe+0x6e/0x76\n==================================================================\n\nPut the reference count of cache_cred in cachefiles_daemon_unbind() to\nfix the problem. And also put cache_cred in cachefiles_add_cache() error\nbranch to avoid memory leaks."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9ae326a69004dea8af2dae4fde58de27db700a8d","status":"affected","lessThan":"cb5466783793e66272624cf71925ae1d1ba32083","versionType":"git"},{"version":"9ae326a69004dea8af2dae4fde58de27db700a8d","status":"affected","lessThan":"037d5a949b0455540ef9aab34c10ddf54b65d285","versionType":"git"},{"version":"9ae326a69004dea8af2dae4fde58de27db700a8d","status":"affected","lessThan":"43eccc5823732ba6daab2511ed32dfc545a666d8","versionType":"git"},{"version":"9ae326a69004dea8af2dae4fde58de27db700a8d","status":"affected","lessThan":"94965be37add0983672e48ecb33cdbda92b62579","versionType":"git"},{"version":"9ae326a69004dea8af2dae4fde58de27db700a8d","status":"affected","lessThan":"8b218e2f0a27a9f09428b1847b4580640b9d1e58","versionType":"git"},{"version":"9ae326a69004dea8af2dae4fde58de27db700a8d","status":"affected","lessThan":"38e921616320d159336b0ffadb09e9fb4945c7c3","versionType":"git"},{"version":"9ae326a69004dea8af2dae4fde58de27db700a8d","status":"affected","lessThan":"9cac69912052a4def571fedf1cb9bb4ec590e25a","versionType":"git"},{"version":"9ae326a69004dea8af2dae4fde58de27db700a8d","status":"affected","lessThan":"e21a2f17566cbd64926fb8f16323972f7a064444","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/cachefiles/cache.c","fs/cachefiles/daemon.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.30","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.30","versionType":"semver"},{"version":"4.19.309","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.271","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.212","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.151","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.80","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.19","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.7","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/cachefiles/cache.c","fs/cachefiles/daemon.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/cb5466783793e66272624cf71925ae1d1ba32083"},{"url":"https://git.kernel.org/stable/c/037d5a949b0455540ef9aab34c10ddf54b65d285"},{"url":"https://git.kernel.org/stable/c/43eccc5823732ba6daab2511ed32dfc545a666d8"},{"url":"https://git.kernel.org/stable/c/94965be37add0983672e48ecb33cdbda92b62579"},{"url":"https://git.kernel.org/stable/c/8b218e2f0a27a9f09428b1847b4580640b9d1e58"},{"url":"https://git.kernel.org/stable/c/38e921616320d159336b0ffadb09e9fb4945c7c3"},{"url":"https://git.kernel.org/stable/c/9cac69912052a4def571fedf1cb9bb4ec590e25a"},{"url":"https://git.kernel.org/stable/c/e21a2f17566cbd64926fb8f16323972f7a064444"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T20:05:09.433Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"4.19.309"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"5.4.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"5.10.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"5.15.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.1.80"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.6.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.7.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.8"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA 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