SB20260507270 - Missing Release of Resource after Effective Lifetime in Linux kernel xfrm

Description

This security bulletin contains information about 1 vulnerability.

1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-43090)

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a refcount leak in xfrm_migrate_policy_find when handling policy migration lookups. A local user can trigger the vulnerable code path to cause a denial of service.

The issue is caused by a redundant reference increment because the lookup function already returns a policy with a held reference.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/21e235a36cfb6d145cefb10728f12f5dc5412f54
• https://git.kernel.org/stable/c/70c2a89a3bc207c3bfbf6f21bb439809e0a4a27a
• https://git.kernel.org/stable/c/83317cce60a032c49480dcdabe146435bd689d03
• https://git.kernel.org/stable/c/836ee1b0426ea3db31531e9581cc32f513d24e32