PT-2025-33753 · Linux+2 · Linux Kernel+2
Jann Horn
·
Published
2025-07-28
·
Updated
2026-01-26
·
CVE-2025-38554
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 use-after-free (UAF) issue within the memory management subsystem. This flaw occurs when a virtual memory area's (VMA)
mm pointer is freed after the VMA's reference count (vm refcnt) has been dropped. A race condition can occur where a VMA is recycled and subsequently accessed with a stale mm pointer, leading to a UAF. The issue arises from a mismatch in the timing of reference count decrements and VMA recycling, potentially triggered by operations like mmap and munmap. Specifically, lock vma under rcu() can detect a mismatched vm mm pointer after the VMA has been recycled, leading to a call to vma refcount put(), which then incorrectly attempts to wake up a waiting process using the freed memory.Recommendations:
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Use After Free
NULL Pointer Dereference
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Related Identifiers
Affected Products
Astra Linux
Linux Kernel
Suse