CVE-2026-89562

Last refreshed2026-10-19

Status: UPDATED | Advisory ID: CVE-2026-89562

Key Details

CVE	CVE-2026-89562
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-19
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89562
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89562

Source

Reference

NVD

CVE