CVE-2026-64015security/keys: fix missed RCU read section on lookup
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 before 4c5d407ba3ff7f30561ff73ba1b07ed70c864edc; from b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 before cefa4265b11176c897a7d9e8e54d89e3701c5584; from b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 before 5659e6923cb72f8e18e8b539109ab512455fe195; from b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 before 50bb3435a5e627bfbdc52eb4536f49f88b3486b8; from b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 before 66288dcadf80974436250e9f70ed848836b835b5; from b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 before 43a1e3744548e6fd85873e6fb43e293eb4010694 | CNA record |
linux linux_kernel linux:linux_kernel | from 3.13 before 6.1.175; from 6.2 before 6.6.142; from 6.7 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11; 7.1; 7.1; 7.1; and 2 more ranges | NVD |
References
- https://git.kernel.org/stable/c/4c5d407ba3ff7f30561ff73ba1b07ed70c864edcpatch
- https://git.kernel.org/stable/c/cefa4265b11176c897a7d9e8e54d89e3701c5584patch
- https://git.kernel.org/stable/c/5659e6923cb72f8e18e8b539109ab512455fe195patch
- https://git.kernel.org/stable/c/50bb3435a5e627bfbdc52eb4536f49f88b3486b8patch
- https://git.kernel.org/stable/c/66288dcadf80974436250e9f70ed848836b835b5patch
- https://git.kernel.org/stable/c/43a1e3744548e6fd85873e6fb43e293eb4010694patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.