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Vulnerability record · CVE-2026-31668 · published 24 April 2026

CVE-2026-31668: Linux kernel vulnerability

Linux · Linux Kernel

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.

9.8 CVSS 3.1 Critical EPSS 0.79% · top 45.4%
9.8CVSS 3.1 base score
0.79%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/17d87d42874f5d6c1a0ccc6d9190dfe82a9a7a6a Patch
https://git.kernel.org/stable/c/1dec91d3b1cefb82635761b7812154af3ef46449 Patch
https://git.kernel.org/stable/c/57d0374d14fa667dec6952173b93e7e84486d5c9 Patch
https://git.kernel.org/stable/c/6305ad032b03d2ea4181b953a66e19a9a6ed053c Patch
https://git.kernel.org/stable/c/750569d6987a0ff46317a4b86eb3907e296287bf Patch
https://git.kernel.org/stable/c/84d458018b147176b259347103fccb7e93abd2b1 Patch
https://git.kernel.org/stable/c/c3812651b522fe8437ebb7063b75ddb95b571643 Patch
https://git.kernel.org/stable/c/fb56de5d99218de49d5d43ef3a99e062ecd0f9a1 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31668), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.