CVE-2026-64015 (GCVE-0-2026-64015)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-07-20 13:42
VLAI
Title
security/keys: fix missed RCU read section on lookup
Summary
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, just do the simple RCU locking that the assoc_array was designed for.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 , < 4c5d407ba3ff7f30561ff73ba1b07ed70c864edc (git)
Affected: b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 , < cefa4265b11176c897a7d9e8e54d89e3701c5584 (git)
Affected: b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 , < 5659e6923cb72f8e18e8b539109ab512455fe195 (git)
Affected: b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 , < 50bb3435a5e627bfbdc52eb4536f49f88b3486b8 (git)
Affected: b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 , < 66288dcadf80974436250e9f70ed848836b835b5 (git)
Affected: b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 , < 43a1e3744548e6fd85873e6fb43e293eb4010694 (git)
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Linux Linux Affected: 3.13
Unaffected: 0 , < 3.13 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.