PT-2025-49375 · Linux+3 · Linux Kernel+3
Published
2025-11-03
·
Updated
2026-04-20
·
CVE-2025-40274
CVSS v2.0
4.4
Medium
| Vector | AV:L/AC:M/Au:S/C:N/I:N/A:C |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The Linux kernel contains a flaw within the KVM subsystem related to memory management. Specifically, the issue arises when unbinding a memslot from a guest memfd instance while the associated file is being released. This can lead to a use-after-free condition, potentially resulting in a system crash. The problem occurs because the bindings are not removed even when the guest memfd file is dying, and freeing the memslot before the file is fully released can cause a write to freed memory. The issue was detected by syzbot+KASAN.
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