Answer in brief
CVE-2025-21893 records a High severity (CVSS 7.8) vulnerability in keys: Fix UAF in key_put(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=9578e327b2b4935a25d49e3891b8fcca9b6c10c6 <6afe2ea2daec156bd94ad2c5a6f4f4c48240dcd3 || >=9578e327b2b4935a25d49e3891b8fcca9b6c10c6 <f6a3cf833188e897c97028cd7b926e3f2cb1a8c0 || >=9578e327b2b4935a25d49e3891b8fcca9b6c10c6 <75845c6c1a64483e9985302793dbf0dfa5f71e32 | 6afe2ea2daec156bd94ad2c5a6f4f4c48240dcd3, f6a3cf833188e897c97028cd7b926e3f2cb1a8c0, 75845c6c1a64483e9985302793dbf0dfa5f71e32 |
| Linux/Linuxgeneric | 6.10 | Not reported |
Published upstream
Mar 31, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.