Unknown

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

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.

Published Sep 24, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.2%

ahead of 9% of scored CVEs · Oct 16, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 64aa348edc617dea17bbd01ddee4e47886d5ec8c and < f6093ff67ea6e347574819ed23e96e0f82a25ffc≥ 64aa348edc617dea17bbd01ddee4e47886d5ec8c and < 59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2≥ 64aa348edc617dea17bbd01ddee4e47886d5ec8c and < f56e54fd24f05e9de528fcb77f6084f80c8066ce≥ 64aa348edc617dea17bbd01ddee4e47886d5ec8c and < 5c3bff6cf26e6a54fbf8b893a879c32824d2d50d≥ 64aa348edc617dea17bbd01ddee4e47886d5ec8c and < b2113dcd8238bf00ce37a34e67b29cf31d32a545≥ 64aa348edc617dea17bbd01ddee4e47886d5ec8c and < e7c69c6695d84220847cca62a45e879e71e79e9d≥ 64aa348edc617dea17bbd01ddee4e47886d5ec8c and < 9be10f49dfc2e4b472b3a5f346483b67374774b8≥ 64aa348edc617dea17bbd01ddee4e47886d5ec8c and < 7577e00b9ab506202b9f1a33de3cc8cc6413a4db and 1 more version 2.6.27	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 16, 2026 · 2 reading(s) · max 0.20%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 24, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

8 on the record

git.kernel.org/stable/c/f56e54fd24f05e9de528fcb77f6084f80c8066ce
NIST National Vulnerability Database
git.kernel.org/stable/c/7577e00b9ab506202b9f1a33de3cc8cc6413a4db
NIST National Vulnerability Database
git.kernel.org/stable/c/f6093ff67ea6e347574819ed23e96e0f82a25ffc
NIST National Vulnerability Database
git.kernel.org/stable/c/e7c69c6695d84220847cca62a45e879e71e79e9d
NIST National Vulnerability Database
git.kernel.org/stable/c/9be10f49dfc2e4b472b3a5f346483b67374774b8
NIST National Vulnerability Database
git.kernel.org/stable/c/5c3bff6cf26e6a54fbf8b893a879c32824d2d50d
NIST National Vulnerability Database
git.kernel.org/stable/c/59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2
NIST National Vulnerability Database
git.kernel.org/stable/c/b2113dcd8238bf00ce37a34e67b29cf31d32a545
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 2d
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 2d
Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 3d
Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 3d
Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 3d
Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 3d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-93261 is "locking/lockdep: Fix NULL pointer dereference in __lock_set_class()", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.20% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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