CVE-2026-93261Hinoki check available

Kernel crash via unchecked lock-class registration failure

Published Sep 24, 2026 · Updated Sep 24, 2026

NULL pointer dereference in Linux lockdep allows attackers to crash the kernel through a failed lock-class registration. __lock_set_class() subtracts the lock_classes base from a NULL register_lock_class() result, corrupting hlock->class_idx before reacquire_held_locks() dereferences the invalid entry. The published record identifies no attacker-controlled path to exhaust the class pool or cause the other registration failures, so practical reachability is undisclosed.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

NULL pointer dereference in Linux lockdep allows attackers to crash the kernel through a failed lock-class registration. __lock_set_class() subtracts the lock_classes base from a NULL register_lock_class() result, corrupting hlock->class_idx before reacquire_held_locks() dereferences the invalid entry. The published record identifies no attacker-controlled path to exhaust the class pool or cause the other registration failures, so practical reachability is undisclosed.

The record

CVE
CVE-2026-93261
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.27
  2. Affected versionversion=64aa348edc617dea17bbd01ddee4e47886d5ec8c <59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2
  3. Affected versionversion=64aa348edc617dea17bbd01ddee4e47886d5ec8c <5c3bff6cf26e6a54fbf8b893a879c32824d2d50d
  4. Affected versionversion=64aa348edc617dea17bbd01ddee4e47886d5ec8c <7577e00b9ab506202b9f1a33de3cc8cc6413a4db
  5. Affected versionversion=64aa348edc617dea17bbd01ddee4e47886d5ec8c <9be10f49dfc2e4b472b3a5f346483b67374774b8
  6. Affected versionversion=64aa348edc617dea17bbd01ddee4e47886d5ec8c <b2113dcd8238bf00ce37a34e67b29cf31d32a545
  7. Affected versionversion=64aa348edc617dea17bbd01ddee4e47886d5ec8c <e7c69c6695d84220847cca62a45e879e71e79e9d
  8. Affected versionversion=64aa348edc617dea17bbd01ddee4e47886d5ec8c <f56e54fd24f05e9de528fcb77f6084f80c8066ce
  9. Affected versionversion=64aa348edc617dea17bbd01ddee4e47886d5ec8c <f6093ff67ea6e347574819ed23e96e0f82a25ffc

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.27; version=64aa348edc617dea17bbd01ddee4e47886d5ec8c <59a5c7dd331a3dab48100e1ef8e9bb4f9132a2b2; version=64aa348edc617dea17bbd01ddee4e47886d5ec8c <5c3bff6cf26e6a54fbf8b893a879c32824d2d50d; version=64aa348edc617dea17bbd01ddee4e47886d5ec8c <7577e00b9ab506202b9f1a33de3cc8cc6413a4db; version=64aa348edc617dea17bbd01ddee4e47886d5ec8c <9be10f49dfc2e4b472b3a5f346483b67374774b8; version=64aa348edc617dea17bbd01ddee4e47886d5ec8c <b2113dcd8238bf00ce37a34e67b29cf31d32a545; version=64aa348edc617dea17bbd01ddee4e47886d5ec8c <e7c69c6695d84220847cca62a45e879e71e79e9d; version=64aa348edc617dea17bbd01ddee4e47886d5ec8c <f56e54fd24f05e9de528fcb77f6084f80c8066ce; version=64aa348edc617dea17bbd01ddee4e47886d5ec8c <f6093ff67ea6e347574819ed23e96e0f82a25ffc

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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