PT-2025-42252 · Linux+3 · Linux Kernel+3
CVE-2025-39977
·
Published
2025-09-20
·
Updated
2026-07-18
CVSS v3.1
7.8
High
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The Linux kernel contains a flaw related to futex operations that could lead to a use-after-free condition during a requeue operation. Specifically, a race condition can occur where
futex wait requeue pi() may proceed without proper synchronization, potentially accessing invalid memory. This issue arises when a task is woken up after being queued for requeue, and the futex q structure is accessed without appropriate locking. The problem can be prevented by reading futex q::task before updating the futex q::requeue state. A READ ONCE operation on futex q::task before futex requeue pi complete() is sufficient to ensure the variable is read before the state is updated.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Use After Free
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Weakness Enumeration
Related Identifiers
Affected Products
Debian
Linuxmint
Linux Kernel
Ubuntu