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CVE-2026-93261

Unknown

Last modified

CVE-2026-93261 is a vulnerability of currently unknown severity. 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.

Description

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

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 64aa348edc617dea17bbd01ddee4e47886d5ec8c, < f6093ff67ea6e347574819ed23e96e0f82a25ffc; >= 64aa348edc617dea17bbd01ddee4e47886d5ec8c, < 59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2; >= 64aa348edc617dea17bbd01ddee4e47886d5ec8c, < f56e54fd24f05e9de528fcb77f6084f80c8066ce; >= 64aa348edc617dea17bbd01ddee4e47886d5ec8c, < 5c3bff6cf26e6a54fbf8b893a879c32824d2d50d; >= 64aa348edc617dea17bbd01ddee4e47886d5ec8c, < b2113dcd8238bf00ce37a34e67b29cf31d32a545; >= 64aa348edc617dea17bbd01ddee4e47886d5ec8c, < e7c69c6695d84220847cca62a45e879e71e79e9d; >= 64aa348edc617dea17bbd01ddee4e47886d5ec8c, < 9be10f49dfc2e4b472b3a5f346483b67374774b8; >= 64aa348edc617dea17bbd01ddee4e47886d5ec8c, < 7577e00b9ab506202b9f1a33de3cc8cc6413a4db
LinuxLinux2.6.27

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-93261?
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.
How severe is CVE-2026-93261?
Severity scoring for CVE-2026-93261 is pending analysis.
How do I fix CVE-2026-93261?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST