Answer in brief
CVE-2025-39976 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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
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: 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.
Answer in brief
CVE-2025-39976 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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
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: 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.