CVE-2026-92489 xfrm: Fix skb double-free in xfrm_dev_direct_output()
A double-free vulnerability in the Linux kernel's xfrm subsystem allows attackers to cause denial of service or potentially execute code.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-92489?
CVE-2026-92489 is a critical use after free vulnerability in Linux, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
xfrm: Fix skb double-free in xfrm_dev_direct_output()
A return value other than 1 from local_out() means that the skb has been consumed or its ownership was transferred. xfrm_dev_direct_output() nevertheless frees the skb on this path, causing a double-free when netfilter drops the packet and invalidating any other owner.
Return the local_out() result directly, matching the ownership handling in xfrm_output_resume().
Which versions are affected by CVE-2026-92489?
How do I fix CVE-2026-92489?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-92489 being exploited?
There is no known exploitation of CVE-2026-92489 in the wild and no public exploit code.
Sources
Also known as AZL-102143, BELL-CVE-2026-92489, DEBIAN-CVE-2026-92489, GHSA-x3mf-vgc4-phvg, UBUNTU-CVE-2026-92489.