CVE-2026-89562 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-LINUX612-20506923
- published5 Oct 2026
- disclosed11 Sept 2026
Introduced: 11 Sep 2026
NewCVE-2026-89562 (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:
ip6_gre: fix hardware header length for NBMA tunnels
ip6gre_tnl_link_config_route() accumulates the lower device's hardware header length into dev->hard_header_len whenever header_ops is set. This is incorrect for both users of header_ops.
ip6gretap and ip6erspan have a fixed Ethernet hardware header length. For an NBMA ip6gre tunnel, ip6gre_header() creates only the GRE header, the optional FOU or GUE header, and the outer IPv6 header. The lower device header is headroom needed later, not part of the tunnel device's hardware header.
Keep the lower device header in needed_headroom. Set hard_header_len to the tunnel header length only for ARPHRD_IP6GRE devices with header_ops, and leave the fixed Ethernet header length unchanged for tap and erspan devices.
References
- https://security-tracker.debian.org/tracker/CVE-2026-89562
- https://git.kernel.org/stable/c/505b6d296c486ef7d1274f279d4c43a172f63224
- https://git.kernel.org/stable/c/565038b0092f65afe384961c0f548d605bf438b9
- https://git.kernel.org/stable/c/8bfe746afee38dd6e4348ddcd22d554789dbb9ff
- https://git.kernel.org/stable/c/b8282668d8fa7c61b80e8e4890729031c291a16c
- https://git.kernel.org/stable/c/7719f6e7ed2ffddc2c3bb61f4467b76d49e0af6a
- https://git.kernel.org/stable/c/b1e95e3602d8e112458627f14c6c31c21f2188cb
- https://git.kernel.org/stable/c/c3457a5aae5fb43f7023d3f3dc472c2afa22acf0
- https://git.kernel.org/stable/c/cb1afd087aedc90e5274537e4fb9bf3f98e5afdb