CVE-2026-46331: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.6% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: net/sched: fix pedit partial COW leading to page cache corruption tcf_pedit_act() computes the COW range for skb_ensure_writable() once before the key loop using tcfp_off_max_hint, but the hint does not account for the runtime header offset added by typed keys. This can leave part of the write region un-COW'd. Fix by moving skb_ensure_writable() inside the per-key loop where the actual write offset is known, and add overflow checking on the offset arithmetic. For negative offsets (e.g. Ethernet header edits at ingress), use skb_cow() to COW the headroom instead. Guard offset_valid() against INT_MIN, where negation is undefined.

Affected products

• Linux Linux Kernel: from 4.19.244, before 4.20 (fixed in 4.20); from 5.4.195, before 5.5 (fixed in 5.5); from 5.10.117, before 5.11 (fixed in 5.11); from 5.15.41, before 5.16 (fixed in 5.16); from 5.17.9, before 5.18 (fixed in 5.18); from 5.18.1, before 6.12.94 (fixed in 6.12.94); …

Published 2026-06-16. Last modified 2026-09-02.