Answer in brief
CVE-2025-39976 records a High severity (CVSS 7.8) vulnerability in futex: Use correct exit on failure from futex_hash_allocate_default(). 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 | 6.16 | Not reported |
| Linux/Linuxgeneric | >=7c4f75a21f636486d2969d9b6680403ea8483539 <f1635765cd0fdbf27b04d9a50be91a01b5adda13 || >=7c4f75a21f636486d2969d9b6680403ea8483539 <4ec3c15462b9f44562f45723a92e2807746ba7d1 | f1635765cd0fdbf27b04d9a50be91a01b5adda13, 4ec3c15462b9f44562f45723a92e2807746ba7d1 |
Published upstream
Oct 15, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 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: futex: Use correct exit on failure from futex_hash_allocate_default() copy_process() uses the wrong error exit path from futex_hash_allocate_default(). After exiting from futex_hash_allocate_default(), neither tasklist_lock nor siglock has been acquired. The exit label bad_fork_core_free unlocks both of these locks which is wrong. The next exit label, bad_fork_cancel_cgroup, is the correct exit. sched_cgroup_fork() did not allocate any resources that need to freed. Use bad_fork_cancel_cgroup on error exit from futex_hash_allocate_default().
Quoted source text, attributed separately from HOL analysis.