Linux Kernel up to 7.2.5 Lockdep __lock_set_class null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00+

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2.5. It has been declared as critical. Affected by this issue is the function __lock_set_class of the component Lockdep. Such manipulation leads to null pointer dereference. This vulnerability is referenced as CVE-2026-93261. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 7.2.5. Affected by this issue is the function __lock_set_class of the component Lockdep. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-93261 since 09/17/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/24/2026).

Upgrading to version 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch f6093ff67ea6e347574819ed23e96e0f82a25ffc/59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2/f56e54fd24f05e9de528fcb77f6084f80c8066ce/5c3bff6cf26e6a54fbf8b893a879c32824d2d50d/b2113dcd8238bf00ce37a34e67b29cf31d32a545/e7c69c6695d84220847cca62a45e879e71e79e9d/9be10f49dfc2e4b472b3a5f346483b67374774b8/7577e00b9ab506202b9f1a33de3cc8cc6413a4db is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.270/5.15.221/6.1.188/6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: f6093ff67ea6e347574819ed23e96e0f82a25ffc/59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2/f56e54fd24f05e9de528fcb77f6084f80c8066ce/5c3bff6cf26e6a54fbf8b893a879c32824d2d50d/b2113dcd8238bf00ce37a34e67b29cf31d32a545/e7c69c6695d84220847cca62a45e879e71e79e9d/9be10f49dfc2e4b472b3a5f346483b67374774b8/7577e00b9ab506202b9f1a33de3cc8cc6413a4db

Timelineinfo

09/17/2026 CVE reserved
09/24/2026 +7 days Advisory disclosed
09/24/2026 +0 days VulDB entry created
09/24/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-93261 (🔒)
GCVE (CVE): GCVE-0-2026-93261
GCVE (VulDB): GCVE-100-409520

Entryinfo

Created: 09/24/2026 19:00
Changes: 09/24/2026 19:00 (59)
Complete: 🔍
Cache ID: 216::103

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