CVE-2026-93261

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux64aa348edc617dea17bbd01ddee4e47886d5ec8c < f6093ff67ea6e347574819ed23e96e0f82a25ffcaffected
LinuxLinux64aa348edc617dea17bbd01ddee4e47886d5ec8c < 59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2affected
LinuxLinux64aa348edc617dea17bbd01ddee4e47886d5ec8c < f56e54fd24f05e9de528fcb77f6084f80c8066ceaffected
LinuxLinux64aa348edc617dea17bbd01ddee4e47886d5ec8c < 5c3bff6cf26e6a54fbf8b893a879c32824d2d50daffected
LinuxLinux64aa348edc617dea17bbd01ddee4e47886d5ec8c < b2113dcd8238bf00ce37a34e67b29cf31d32a545affected
LinuxLinux64aa348edc617dea17bbd01ddee4e47886d5ec8c < e7c69c6695d84220847cca62a45e879e71e79e9daffected
LinuxLinux64aa348edc617dea17bbd01ddee4e47886d5ec8c < 9be10f49dfc2e4b472b3a5f346483b67374774b8affected
LinuxLinux64aa348edc617dea17bbd01ddee4e47886d5ec8c < 7577e00b9ab506202b9f1a33de3cc8cc6413a4dbaffected
LinuxLinux2.6.27affected
LinuxLinux0 < 2.6.27unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References