CVE-2026-31668

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-31668

Key Details

CVE	CVE-2026-31668
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; 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:

seg6: separate dst_cache for input and output paths in seg6 lwtunnel

The seg6 lwtunnel uses a single dst_cache per encap route, shared

between seg6_input_core() and seg6_output_core(). These two paths

can perform the post-encap SID lookup in different routing contexts

(e.g., ip rules matching on the ingress interface, or VRF table

separation). Whichever path runs first populates the cache, and the

other reuses it blindly, bypassing its own lookup.

Fix this by splitting the cache into cache_input and cache_output,

so each path maintains its own cached dst independently. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-31668
CVE	https://www.cve.org/CVERecord?id=CVE-2026-31668

Source

Reference

NVD

CVE