CVE-2026-23204: Linux Kernel

High severity, CVSS 7.1. EPSS: 0.1% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_u32: use skb_header_pointer_careful() skb_header_pointer() does not fully validate negative @offset values. Use skb_header_pointer_careful() instead. GangMin Kim provided a report and a repro fooling u32_classify(): BUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0 net/sched/cls_u32.c:221

Affected products

• Linux Linux Kernel: from 2.6.35.1, before 6.6.124 (fixed in 6.6.124); from 6.7, before 6.12.70 (fixed in 6.12.70); from 6.13, before 6.18.10 (fixed in 6.18.10); version 2.6.35 only; version 6.19 only

Published 2026-02-14. Last modified 2026-07-14.