VulnerabilityPublished 24 Sep 2026Updated 19 Oct 2026

CVE-2026-93261: Linux kernel · locking/lockdep: Fix NULL pointer dereference in __lock_set_class()

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in f6093ff67ea6e347574819ed23e96e0f82a25ffc : update Linux kernel when convenient.

Data as of 26 Oct 2026, 12:55 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in f6093ff67ea6e347574819ed23e96e0f82a25ffc, f56e54fd24f05e9de528fcb77f6084f80c8066ce, e7c69c6695d84220847cca62a45e879e71e79e9d +5

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 64aa348edc617dea17bbd01ddee4e47886d5ec8c, < f6093ff67ea6e347574819ed23e96e0f82a25ffc	Fixed in f6093ff67ea6e347574819ed23e96e0f82a25ffc
LinuxLinux	Affected ≥ 64aa348edc617dea17bbd01ddee4e47886d5ec8c, < f56e54fd24f05e9de528fcb77f6084f80c8066ce	Fixed in f56e54fd24f05e9de528fcb77f6084f80c8066ce
LinuxLinux	Affected ≥ 64aa348edc617dea17bbd01ddee4e47886d5ec8c, < e7c69c6695d84220847cca62a45e879e71e79e9d	Fixed in e7c69c6695d84220847cca62a45e879e71e79e9d
LinuxLinux	Affected ≥ 64aa348edc617dea17bbd01ddee4e47886d5ec8c, < b2113dcd8238bf00ce37a34e67b29cf31d32a545	Fixed in b2113dcd8238bf00ce37a34e67b29cf31d32a545
LinuxLinux	Affected ≥ 64aa348edc617dea17bbd01ddee4e47886d5ec8c, < 7577e00b9ab506202b9f1a33de3cc8cc6413a4db	Fixed in 7577e00b9ab506202b9f1a33de3cc8cc6413a4db
LinuxLinux	Affected ≥ 64aa348edc617dea17bbd01ddee4e47886d5ec8c, < 59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2	Fixed in 59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2

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.

References

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