CVE-2026-31663
kernel: xfrm: hold dev ref until after transport_finish NF_HOOK
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · April 24, 2026
Updated · October 14, 2026
Description
A flaw was found in the Linux kernel's xfrm (IP eXtensible FRamework) subsystem. This vulnerability involves a race condition where a network device's reference is released too early during packet processing after asynchronous cryptography. This premature release can lead to the system attempting to access a deallocated device, potentially causing a system crash (Denial of Service).
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
CVSS / CWE
CVSS 3.1 · 7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-826 · Premature Release of Resource During Expected Lifetime