CVE-2026-89950 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-LINUX612-20507211
- published5 Oct 2026
- disclosed16 Sept 2026
Introduced: 16 Sep 2026
NewCVE-2026-89950 (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: mcast: linearize skbuff for packet generation
batadv_mcast_forw_packet() and batadv_mcast_forw_scrape() is not only called (indirectly) by the unsharing+linearizing batadv_recv_mcast_packet() handler. When it is called (indirectly) by batadv_mcast_forw_mcsend() then it will be unshared but not linearized. The SKB_LINEAR_ASSERT() can therefore cause a fatal BUG().
The linearization should happen during the expansion of the head because the scrape function can be hit already during the initial batadv_mcast_forw_mode() selection code:
- batadv_interface_tx
- batadv_mcast_forw_mode
- batadv_mcast_forw_mode_by_count()
- batadv_mcast_forw_push() -> calls batadv_mcast_forw_expand_head() before everything else
- batadv_mcast_forw_push_tvlvs()
- batadv_mcast_forw_push_dests()
- batadv_mcast_forw_push_adjust_padding()
- batadv_mcast_forw_scrape()
References
- https://security-tracker.debian.org/tracker/CVE-2026-89950
- https://git.kernel.org/stable/c/2879177539e3ece483a8e5406970373698e9a6c5
- https://git.kernel.org/stable/c/6a30a59e2660afd03c975f1b8eae6a2301161197
- https://git.kernel.org/stable/c/a9603e0a7cb5e0cddc6b23af153cf7daafc5c55e
- https://git.kernel.org/stable/c/c32e5e25c41201c8c3b796a4ab2c45103187091e