{"cve":"CVE-2026-93261","nvd":{"published":"2026-09-24T16:17:22.780","modified":"2026-10-19T10:17:17.410","status":"Received","description":"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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2","https://git.kernel.org/stable/c/5c3bff6cf26e6a54fbf8b893a879c32824d2d50d","https://git.kernel.org/stable/c/7577e00b9ab506202b9f1a33de3cc8cc6413a4db","https://git.kernel.org/stable/c/9be10f49dfc2e4b472b3a5f346483b67374774b8","https://git.kernel.org/stable/c/b2113dcd8238bf00ce37a34e67b29cf31d32a545"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:56:02.509636177+00:00"},"epss":{"cve":"CVE-2026-93261","score":0.00196,"percentile":0.09234,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}