PT-2025-42266 · Linux+3 · Linux Kernel+3
Published
2025-09-28
·
Updated
2026-05-07
·
CVE-2025-39992
CVSS v2.0
6.0
Medium
| Vector | AV:L/AC:H/Au:S/C:C/I:C/A:C |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
A flaw exists in the Linux kernel related to memory management and swap operations. Specifically, a race condition between
fork() and swapoff can lead to a kernel NULL pointer dereference when traversing virtual memory areas (VMAs) during the unuse mm() process, triggered by the swapoff operation. This occurs when a process is forked, and a signal is sent to the parent process before the VMA duplication is complete, resulting in a partially valid memory tree being exposed. The issue arises when attempting to operate on a zero entry within the VMA list. The problem is addressed by ensuring a stable address space before operating on the VMA.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
NULL Pointer Dereference
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Weakness Enumeration
Related Identifiers
Affected Products
Linuxmint
Linux Kernel
Suse
Ubuntu