security/keys: fix missed RCU read section on lookup
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.1.175, 6.6.142, 6.12.92, 6.18.34, 7.0.11
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 · fixed in 4c5d407ba3ff7f30561ff73ba1b07ed70c864edc; From b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 · fixed in cefa4265b11176c897a7d9e8e54d89e3701c5584; From b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 · fixed in 5659e6923cb72f8e18e8b539109ab512455fe195; From b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 · fixed in 50bb3435a5e627bfbdc52eb4536f49f88b3486b8; From b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 · fixed in 66288dcadf80974436250e9f70ed848836b835b5; From b2a4df200d570b2c33a57e1ebfa5896e4bc81b69 · fixed in 43a1e3744548e6fd85873e6fb43e293eb4010694
- Linux Linux
3.13
- KernelLinux
From 3.13.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.142; From 6.7.0 · fixed in 6.12.92; From 6.13.0 · fixed in 6.18.34; From 6.19.0 · fixed in 7.0.11