CVE-2026-53174

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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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/overlayfs/readdir.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "e7051909a01bfb883bfa78b27514854068ac4b85", "status": "affected", "version": "d25e4b739f8378419f990983f2542160e79738c5", "versionType": "git"}, {"lessThan": "1711b6ed6953cee5940ca4c3a6e77f1b3798cee2", "status": "affected", "version": "d25e4b739f8378419f990983f2542160e79738c5", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/overlayfs/readdir.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.19"}, {"lessThan": "6.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.13", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6A64BF9F-3BCA-42FD-98CB-8F03474D2B1E", "versionEndExcluding": "7.0.13", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*", "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*", "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*", "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*", "matchCriteriaId": "81DFF19E-9CF8-49C6-8C36-1E4038622933", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*", "matchCriteriaId": "B0E8FC71-3952-444C-83E9-718DBBBEC615", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}], "id": "CVE-2026-53174", "lastModified": "2026-07-06T12:44:52.313", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-06-25T09:16:34.747", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1711b6ed6953cee5940ca4c3a6e77f1b3798cee2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e7051909a01bfb883bfa78b27514854068ac4b85"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ovl: keep err zero after successful ovl_cache_get()", "id": "2492791", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492791"}, "csaw": false, "cwe": "CWE-253", "details": ["A flaw was found in the Linux kernel's overlay filesystem (ovl) component. Specifically, an issue in the `ovl_iterate_merged()` function incorrectly stores an error pointer even after a successful cache operation. This can lead to the function returning a misleading non-zero error, potentially causing unexpected behavior or instability within the system. This vulnerability is related to incorrect error handling during directory iteration."], "name": "CVE-2026-53174", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53174\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53174\nhttps://lore.kernel.org/linux-cve-announce/2026062553-CVE-2026-53174-1b7c@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d25e4b739f8378419f990983f2542160e79738c5,e7051909a01bfb883bfa78b27514854068ac4b85)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d25e4b739f8378419f990983f2542160e79738c5,1711b6ed6953cee5940ca4c3a6e77f1b3798cee2)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.13,8.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-06-25T11:45:03.802346+00:00", "updated": "2026-08-12T08:30:16.971193+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}