security/keys: fix missed RCU read section on lookup

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64015
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:41 UTC
Updated2026-07-20 15:17:02 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: security/keys: fix missed RCU read section on lookup Nicholas Carlini reports that the keyring code calls assoc_array_find() in find_key_to_update() without holding the RCU read lock, while the assoc_array_gc() code really is designed around removing the node from the tree and then freeing it after an RCU grace-period. The regular key handling doesn't see this because holding the keyring semaphore hides any lifetime issues, but the persistent key handling uses a different model. Instead of extending the keyring locking, just do the simple RCU locking that the assoc_array was designed for.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001720000 probability, percentile 0.069020000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 4c5d407ba3ff7f30561ff73ba1b07ed70c864edc git Not specified
CNA Linux Linux affected b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 cefa4265b11176c897a7d9e8e54d89e3701c5584 git Not specified
CNA Linux Linux affected b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 5659e6923cb72f8e18e8b539109ab512455fe195 git Not specified
CNA Linux Linux affected b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 50bb3435a5e627bfbdc52eb4536f49f88b3486b8 git Not specified
CNA Linux Linux affected b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 66288dcadf80974436250e9f70ed848836b835b5 git Not specified
CNA Linux Linux affected b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 43a1e3744548e6fd85873e6fb43e293eb4010694 git Not specified
CNA Linux Linux affected 3.13 Not specified
CNA Linux Linux unaffected 3.13 semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.142 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/43a1e3744548e6fd85873e6fb43e293eb4010694 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cefa4265b11176c897a7d9e8e54d89e3701c5584 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4c5d407ba3ff7f30561ff73ba1b07ed70c864edc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/66288dcadf80974436250e9f70ed848836b835b5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5659e6923cb72f8e18e8b539109ab512455fe195 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/50bb3435a5e627bfbdc52eb4536f49f88b3486b8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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