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CVE-2026-93261

locking/lockdep: Fix NULL pointer dereference in __lock_set_class()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: locking/lockdep: Fix NULL pointer dereference in __lock_set_class() register_lock_class() can return NULL when the lock class pool is exhausted, graph_lock() fails, or key validation fails. However, __lock_set_class() uses the return value directly in pointer arithmetic without a NULL check: class = register_lock_class(lock, subclass, 0); hlock->class_idx = class - lock_classes; If class is NULL, this computes a wild offset that corrupts hlock->class_idx. The subsequent reacquire_held_locks() call will invoke hlock_class() with this corrupted index, leading to a NULL or out-of-bounds pointer dereference. Add the missing NULL check, consistent with how __lock_acquire() already handles this case at the same call site.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 64aa348edc617dea17bbd01ddee4e47886d5ec8c · fixed in f6093ff67ea6e347574819ed23e96e0f82a25ffc; From 64aa348edc617dea17bbd01ddee4e47886d5ec8c · fixed in 59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2; From 64aa348edc617dea17bbd01ddee4e47886d5ec8c · fixed in f56e54fd24f05e9de528fcb77f6084f80c8066ce; From 64aa348edc617dea17bbd01ddee4e47886d5ec8c · fixed in 5c3bff6cf26e6a54fbf8b893a879c32824d2d50d; From 64aa348edc617dea17bbd01ddee4e47886d5ec8c · fixed in b2113dcd8238bf00ce37a34e67b29cf31d32a545; From 64aa348edc617dea17bbd01ddee4e47886d5ec8c · fixed in e7c69c6695d84220847cca62a45e879e71e79e9d; From 64aa348edc617dea17bbd01ddee4e47886d5ec8c · fixed in 9be10f49dfc2e4b472b3a5f346483b67374774b8; From 64aa348edc617dea17bbd01ddee4e47886d5ec8c · fixed in 7577e00b9ab506202b9f1a33de3cc8cc6413a4db

  • Linux Linux

    2.6.27

  • KernelLinux

    From 2.6.27 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 8

git.kernel.org