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Review reviewHigh

CVE-2026-64015

Linux

In 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, jus...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In 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, jus...

Affected product and versions

Product
Linux
Affected versions
>= b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 < 4c5d407ba3ff7f30561ff73ba1b07ed70c864edc, >= b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 < cefa4265b11176c897a7d9e8e54d89e3701c5584, >= b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 < 5659e6923cb72f8e18e8b539109ab512455fe195, >= b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 < 50bb3435a5e627bfbdc52eb4536f49f88b3486b8, >= b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 < 66288dcadf80974436250e9f70ed848836b835b5, >= b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 < 43a1e3744548e6fd85873e6fb43e293eb4010694, >= 3.13
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available