CVE-2026-89951 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.
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Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20506663
- published5 Oct 2026
- disclosed16 Sept 2026
Introduced: 16 Sep 2026
NewCVE-2026-89951 (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:
batman-adv: fix stale receive device on merged fragments
Fragment reassembly reuses the skb from the highest-numbered buffered fragment as the merged packet. When that fragment was received on a hard interface which is deleted before the chain completes, the merged skb can re-enter the receive path with a stale skb->dev and skb_iif.
batadv_batman_skb_recv() passes such merged packets through the normal receive handlers again. DAT and bridge loop avoidance both derive the ARP header length from skb->dev, so they can dereference the freed net_device before the packet reaches the local mesh interface.
Refresh the receive device metadata from the current receive device before running the packet handlers. This keeps internally reinjected merged fragments consistent with the normal receive path after hard interface teardown.
References
- https://security-tracker.debian.org/tracker/CVE-2026-89951
- https://git.kernel.org/stable/c/2dffc8c44b6e3347b3719c6419c07b4a18fea895
- https://git.kernel.org/stable/c/63d86250fa7cbe22451369bd1c0881dfc8190958
- https://git.kernel.org/stable/c/6df64825f8b199921120c685af2abca14b077331
- https://git.kernel.org/stable/c/a2c272da99c2077088083c14961cf2f1e4506995
- https://git.kernel.org/stable/c/ad46c907d7d9975a285c1e89a4adde652eaa93f5
- https://git.kernel.org/stable/c/e91d2cc7441d89a45bad73ad9789159c7441cb80
- https://git.kernel.org/stable/c/f4b4ae763b5d59319fad62a00c76676758e7dafa
- https://git.kernel.org/stable/c/f830c2dfc1431764db9256b3d5db1695fc9a7f56