CVE-2025-21893
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2025
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
keys: Fix UAF in key_put()
In the Linux kernel, the following vulnerability has been resolved: keys: Fix UAF in key_put() Once a key's reference count has been reduced to 0, the garbage collector thread may destroy it at any time and so key_put() is not allowed to touch the key after that point. The most key_put() is normally allowed to do is to touch key_gc_work as that's a static global variable. However, in an effort to speed up the reclamation of quota, this is now done in key_put() once the key's usage is reduced to 0 - but now the code is looking at the key after the deadline, which is forbidden. Fix this by using a flag to indicate that a key can be gc'd now rather than looking at the key's refcount in the garbage collector.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 9578e327b2b4935a25d49e3891b8fcca9b6c10c6 | affected | git | 6afe2ea2daec156bd94ad2c5a6f4f4c48240dcd3 | Unavailable | None listed |
| 9578e327b2b4935a25d49e3891b8fcca9b6c10c6 | affected | git | f6a3cf833188e897c97028cd7b926e3f2cb1a8c0 | Unavailable | None listed |
| 9578e327b2b4935a25d49e3891b8fcca9b6c10c6 | affected | git | 75845c6c1a64483e9985302793dbf0dfa5f71e32 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 6.10 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 6.10 | Unavailable | None listed |
| 6.12.21 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.13.9 | unaffected | semver | Unavailable | 6.13.* | None listed |
| 6.14 | unaffected | original_commit_for_fix | Unavailable | * | None listed |