CVE-2026-64015

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.

Impact & exploitability

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

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/43a1e3744548e6fd85873e6fb43e293eb4010694 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/43a1e3744548e6fd85873e6fb43e293eb4010694Patch
• https://git.kernel.org/stable/c/4c5d407ba3ff7f30561ff73ba1b07ed70c864edcPatch
• https://git.kernel.org/stable/c/50bb3435a5e627bfbdc52eb4536f49f88b3486b8Patch
• https://git.kernel.org/stable/c/5659e6923cb72f8e18e8b539109ab512455fe195Patch
• https://git.kernel.org/stable/c/66288dcadf80974436250e9f70ed848836b835b5Patch
• https://git.kernel.org/stable/c/cefa4265b11176c897a7d9e8e54d89e3701c5584Patch
• https://git.kernel.org/stable/c/1d8d987a2aacde238ecd0f4946f28cef74c42b79
• https://git.kernel.org/stable/c/5036a9aa7f21fbce89a2a8451bbc177bae2e920d