CVE-2026-46331

What it is

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.

At a glance

Exploitability

Can be exploited locally on the machine with a low-privilege account. High risk of data exposure, data tampering, service disruption.

Exploit odds

0.6% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-06-16 08:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-15 02:19 UTC Last updatedMost recent change to the record

Details

Published

2026-06-16 08:16 UTC

Last modified

2026-10-15 02:19 UTC

Exploit probability

0.6% · EPSS, next 30 days

Weakness

CWE-190 · Integer overflow

Record status

Modified

Affected

• Linux Kernel < 4.20
• Linux Kernel < 5.5
• Linux Kernel < 5.11
• Linux Kernel < 5.16
• Linux Kernel < 5.18
• Linux Kernel < 6.12.94
• Linux Kernel < 6.18.36
• Linux Kernel < 7.0.13

Attack profile CVSS 3.1 · 7.8

Attack vector

Local

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High