{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53174","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-06-09T07:44:35.389Z","datePublished":"2026-06-25T08:38:51.366Z","dateUpdated":"2026-08-05T12:33:43.620Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:33:43.620Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\novl: keep err zero after successful ovl_cache_get()\n\novl_iterate_merged() stores PTR_ERR(cache) in err before checking\nIS_ERR(cache). On success err holds the truncated cache pointer and\ncan be returned as a bogus non-zero error.\n\nThe syzbot reproducer reaches this through overlay-on-overlay readdir:\n\n  getdents64\n    iterate_dir(outer overlay file)\n      ovl_iterate_merged()\n        ovl_cache_get()\n          ovl_dir_read_merged()\n            ovl_dir_read()\n              iterate_dir(inner overlay file)\n                ovl_iterate_merged()\n\nOnly compute PTR_ERR(cache) on the error path."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable path is reached through local filesystem syscalls, specifically opening/enumerating nested overlayfs directories with getdents/getdents64. It is not reachable from network packets or adjacent/physical input.\nAC:L - The attacker controls the overlay-on-overlay setup and the readdir/getdents trigger, and syzbot demonstrated reproducible crashes. Any pointer-value dependency can be retried or influenced with local heap grooming, so no uncontrollable race or victim state is required.\nPR:L - Creating the crafted overlayfs setup requires local privileges, but overlayfs is marked FS_USERNS_MOUNT and is reachable in a user namespace on systems allowing unprivileged user namespaces. Thus a basic local user is sufficient in the highest reasonable deployment scenario.\nUI:N - No victim action is needed once the attacker has local execution; the attacker mounts/prepares the nested overlay and invokes getdents directly. The vulnerable code runs synchronously in the attacker's syscall path.\nS:U - The impact remains within the kernel and the local system security authority. This is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug can convert a successful overlay directory-cache pointer into a bogus cache pointer and produce wild memory access in ovl_seek_cursor/ovl_iterate. On severe but reasonable architectures/configurations this can amount to stale/truncated kernel-pointer use, so kernel memory disclosure is defensible.\nI:H - The same wild-pointer/UAF-style path can cause overlayfs to interpret invalid or attacker-influenced memory as ovl_cache_entry state and perform cache-entry updates through it. Given the kernel memory corruption primitive and uncertainty, high integrity impact is the safer defensible choice.\nA:H - The public syzbot report is a general protection fault/Oops with KASAN wild-memory-access in ovl_iterate, reachable from getdents. A local attacker can repeatedly trigger this path to crash or panic affected kernels."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/overlayfs/readdir.c"],"versions":[{"version":"d25e4b739f8378419f990983f2542160e79738c5","lessThan":"e7051909a01bfb883bfa78b27514854068ac4b85","status":"affected","versionType":"git"},{"version":"d25e4b739f8378419f990983f2542160e79738c5","lessThan":"1711b6ed6953cee5940ca4c3a6e77f1b3798cee2","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/overlayfs/readdir.c"],"versions":[{"version":"6.19","status":"affected"},{"version":"0","lessThan":"6.19","status":"unaffected","versionType":"semver"},{"version":"7.0.13","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.0.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/e7051909a01bfb883bfa78b27514854068ac4b85"},{"url":"https://git.kernel.org/stable/c/1711b6ed6953cee5940ca4c3a6e77f1b3798cee2"}],"title":"ovl: keep err zero after successful ovl_cache_get()","x_generator":{"engine":"bippy-1.2.0"}}}}