{"schema":"threatline.record/2","record":{"id":"CVE-2026-93261","aliases":[],"summary":"locking/lockdep: Fix NULL pointer dereference in __lock_set_class()","details":"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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93261","source_modified_at":"2026-10-19T09:08:14.521Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","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"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93261","source_modified_at":"2026-10-19T09:08:14.521Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","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"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93261","source_modified_at":"2026-10-19T09:08:14.521Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93261","source_modified_at":"2026-10-19T09:08:14.521Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5c3bff6cf26e6a54fbf8b893a879c32824d2d50d","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93261","source_modified_at":"2026-10-19T09:08:14.521Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"9be10f49dfc2e4b472b3a5f346483b67374774b8","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93261","source_modified_at":"2026-10-19T09:08:14.521Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"7577e00b9ab506202b9f1a33de3cc8cc6413a4db","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00196,"percentile":0.08846,"score_date":"2026-10-23"},"published_at":"2026-09-24T15:51:59.638Z","modified_at":"2026-10-19T09:08:14.521Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-93261","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:08:14.521Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-93261","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/f6093ff67ea6e347574819ed23e96e0f82a25ffc"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/f56e54fd24f05e9de528fcb77f6084f80c8066ce"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/5c3bff6cf26e6a54fbf8b893a879c32824d2d50d"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/b2113dcd8238bf00ce37a34e67b29cf31d32a545"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/e7c69c6695d84220847cca62a45e879e71e79e9d"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/9be10f49dfc2e4b472b3a5f346483b67374774b8"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/7577e00b9ab506202b9f1a33de3cc8cc6413a4db"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:08:14.521Z","content_hash":"d8983e93c2d8c337a2eabb0379973a24ae47f72e1a8bebde241537a1b096f434"}}