CVE-2026-80846 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20506979
- published5 Oct 2026
- disclosed4 Sept 2026
Introduced: 4 Sep 2026
CVE-2026-80846 (opens in a new tab)How to fix?
Upgrade Debian:12 linux-6.12 to version 6.12.111-1~deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
xfrm: drop ESP-in-TCP packets with no ingress device
ESP-in-TCP receives records through the TCP strparser. handle_esp() restores skb->dev from the saved skb_iif before passing the packet into the XFRM input path.
Queued TCP data can be processed after the original ingress device has been removed, for example during veth or net namespace teardown. In that case dev_get_by_index_rcu() returns NULL. The XFRM IPv4 and IPv6 input paths both expect skb->dev to be valid while building the route lookup, so queued ESP-in-TCP data can dereference a NULL device.
Drop the packet if the saved ingress device can no longer be resolved. Such a packet can no longer be routed through the normal XFRM receive path, and this preserves the existing behaviour for packets whose ingress device still exists.
References
- https://security-tracker.debian.org/tracker/CVE-2026-80846
- https://git.kernel.org/stable/c/239d0f71af09dc2029fd4d730cb24b8c83aaa43a
- https://git.kernel.org/stable/c/2dd1609cadff46c4b20ce53b91ab9cce1380456a
- https://git.kernel.org/stable/c/328e40aa774b446969c69b654c52a051a95af8a1
- https://git.kernel.org/stable/c/6af5cdb03819a5ce6e945992635c6c5e91045367
- https://git.kernel.org/stable/c/7911e0236616487b89db6bd3ba3f408abd10eb23
- https://git.kernel.org/stable/c/943d95233b8b4a88994e244fcf466f8c403d63f1
- https://git.kernel.org/stable/c/c296d25efbc840be24de83f56d43bc47e714ace9
- https://git.kernel.org/stable/c/e1d7c5ac1c246ce5775f604515de0a59fbf2116e
- https://git.kernel.org/stable/c/f00235f9d12301183d61f75fbe4105506f3e5140