CVE-2026-93261

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-93261", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-17T16:02:15.097Z", "datePublished": "2026-09-24T15:51:59.638Z", "dateUpdated": "2026-10-19T09:08:14.521Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:08:14.521Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlocking/lockdep: Fix NULL pointer dereference in __lock_set_class()\n\nregister_lock_class() can return NULL when the lock class pool is\nexhausted, graph_lock() fails, or key validation fails. However,\n__lock_set_class() uses the return value directly in pointer arithmetic\nwithout a NULL check:\n\n class = register_lock_class(lock, subclass, 0);\n hlock->class_idx = class - lock_classes;\n\nIf class is NULL, this computes a wild offset that corrupts\nhlock->class_idx. The subsequent reacquire_held_locks() call will\ninvoke hlock_class() with this corrupted index, leading to a NULL or\nout-of-bounds pointer dereference.\n\nAdd the missing NULL check, consistent with how __lock_acquire() already\nhandles this case at the same call site."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/locking/lockdep.c"], "versions": [{"version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c", "lessThan": "f6093ff67ea6e347574819ed23e96e0f82a25ffc", "status": "affected", "versionType": "git"}, {"version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c", "lessThan": "59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2", "status": "affected", "versionType": "git"}, {"version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c", "lessThan": "f56e54fd24f05e9de528fcb77f6084f80c8066ce", "status": "affected", "versionType": "git"}, {"version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c", "lessThan": "5c3bff6cf26e6a54fbf8b893a879c32824d2d50d", "status": "affected", "versionType": "git"}, {"version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c", "lessThan": "b2113dcd8238bf00ce37a34e67b29cf31d32a545", "status": "affected", "versionType": "git"}, {"version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c", "lessThan": "e7c69c6695d84220847cca62a45e879e71e79e9d", "status": "affected", "versionType": "git"}, {"version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c", "lessThan": "9be10f49dfc2e4b472b3a5f346483b67374774b8", "status": "affected", "versionType": "git"}, {"version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c", "lessThan": "7577e00b9ab506202b9f1a33de3cc8cc6413a4db", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/locking/lockdep.c"], "versions": [{"version": "2.6.27", "status": "affected"}, {"version": "0", "lessThan": "2.6.27", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "2.6.27", "versionEndExcluding": "5.10.270"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.18.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f6093ff67ea6e347574819ed23e96e0f82a25ffc"}, {"url": "https://git.kernel.org/stable/c/59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2"}, {"url": "https://git.kernel.org/stable/c/f56e54fd24f05e9de528fcb77f6084f80c8066ce"}, {"url": "https://git.kernel.org/stable/c/5c3bff6cf26e6a54fbf8b893a879c32824d2d50d"}, {"url": "https://git.kernel.org/stable/c/b2113dcd8238bf00ce37a34e67b29cf31d32a545"}, {"url": "https://git.kernel.org/stable/c/e7c69c6695d84220847cca62a45e879e71e79e9d"}, {"url": "https://git.kernel.org/stable/c/9be10f49dfc2e4b472b3a5f346483b67374774b8"}, {"url": "https://git.kernel.org/stable/c/7577e00b9ab506202b9f1a33de3cc8cc6413a4db"}], "title": "locking/lockdep: Fix NULL pointer dereference in __lock_set_class()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/locking/lockdep.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "f6093ff67ea6e347574819ed23e96e0f82a25ffc", "status": "affected", "version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c", "versionType": "git"}, {"lessThan": "59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2", "status": "affected", "version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c", "versionType": "git"}, {"lessThan": "f56e54fd24f05e9de528fcb77f6084f80c8066ce", "status": "affected", "version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c", "versionType": "git"}, {"lessThan": "5c3bff6cf26e6a54fbf8b893a879c32824d2d50d", "status": "affected", "version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c", "versionType": "git"}, {"lessThan": "b2113dcd8238bf00ce37a34e67b29cf31d32a545", "status": "affected", "version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c", "versionType": "git"}, {"lessThan": "e7c69c6695d84220847cca62a45e879e71e79e9d", "status": "affected", "version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c", "versionType": "git"}, {"lessThan": "9be10f49dfc2e4b472b3a5f346483b67374774b8", "status": "affected", "version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c", "versionType": "git"}, {"lessThan": "7577e00b9ab506202b9f1a33de3cc8cc6413a4db", "status": "affected", "version": "64aa348edc617dea17bbd01ddee4e47886d5ec8c", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/locking/lockdep.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.27"}, {"lessThan": "2.6.27", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlocking/lockdep: Fix NULL pointer dereference in __lock_set_class()\n\nregister_lock_class() can return NULL when the lock class pool is\nexhausted, graph_lock() fails, or key validation fails. However,\n__lock_set_class() uses the return value directly in pointer arithmetic\nwithout a NULL check:\n\n class = register_lock_class(lock, subclass, 0);\n hlock->class_idx = class - lock_classes;\n\nIf class is NULL, this computes a wild offset that corrupts\nhlock->class_idx. The subsequent reacquire_held_locks() call will\ninvoke hlock_class() with this corrupted index, leading to a NULL or\nout-of-bounds pointer dereference.\n\nAdd the missing NULL check, consistent with how __lock_acquire() already\nhandles this case at the same call site."}], "id": "CVE-2026-93261", "lastModified": "2026-10-19T10:17:17.410", "metrics": {}, "published": "2026-09-24T16:17:22.780", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5c3bff6cf26e6a54fbf8b893a879c32824d2d50d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7577e00b9ab506202b9f1a33de3cc8cc6413a4db"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9be10f49dfc2e4b472b3a5f346483b67374774b8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b2113dcd8238bf00ce37a34e67b29cf31d32a545"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e7c69c6695d84220847cca62a45e879e71e79e9d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f56e54fd24f05e9de528fcb77f6084f80c8066ce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f6093ff67ea6e347574819ed23e96e0f82a25ffc"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: locking/lockdep: Fix NULL pointer dereference in __lock_set_class()", "id": "2540328", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2540328"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nlocking/lockdep: Fix NULL pointer dereference in __lock_set_class()\nregister_lock_class() can return NULL when the lock class pool is\nexhausted, graph_lock() fails, or key validation fails. However,\n__lock_set_class() uses the return value directly in pointer arithmetic\nwithout a NULL check:\nclass = register_lock_class(lock, subclass, 0);\nhlock->class_idx = class - lock_classes;\nIf class is NULL, this computes a wild offset that corrupts\nhlock->class_idx. The subsequent reacquire_held_locks() call will\ninvoke hlock_class() with this corrupted index, leading to a NULL or\nout-of-bounds pointer dereference.\nAdd the missing NULL check, consistent with how __lock_acquire() already\nhandles this case at the same call site.", "A flaw was found in the Linux kernel's lock dependency validator (lockdep). When lock class registration fails, the kernel omits a check for an empty result before calculating internal index values, leading to memory corruption. A local user can exploit this vulnerability during lock reacquisition to cause an invalid memory dereference, resulting in a kernel crash and Denial of Service (DoS)."], "name": "CVE-2026-93261", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-93261\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-93261\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93261.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[64aa348edc617dea17bbd01ddee4e47886d5ec8c,f6093ff67ea6e347574819ed23e96e0f82a25ffc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[64aa348edc617dea17bbd01ddee4e47886d5ec8c,59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[64aa348edc617dea17bbd01ddee4e47886d5ec8c,5c3bff6cf26e6a54fbf8b893a879c32824d2d50d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[64aa348edc617dea17bbd01ddee4e47886d5ec8c,b2113dcd8238bf00ce37a34e67b29cf31d32a545)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[64aa348edc617dea17bbd01ddee4e47886d5ec8c,e7c69c6695d84220847cca62a45e879e71e79e9d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[64aa348edc617dea17bbd01ddee4e47886d5ec8c,9be10f49dfc2e4b472b3a5f346483b67374774b8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[64aa348edc617dea17bbd01ddee4e47886d5ec8c,7577e00b9ab506202b9f1a33de3cc8cc6413a4db)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[64aa348edc617dea17bbd01ddee4e47886d5ec8c,f56e54fd24f05e9de528fcb77f6084f80c8066ce)"}}], "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": "semver", "value": "2.6.27"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.27)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.270,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.221,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.188,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.157,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.110,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.52,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc1,*]"}}], "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": "2026-09-25T04:15:13.334800+00:00", "updated": "2026-10-01T23:15:16.131902+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}