CVE-2026-46331 net/sched: fix pedit partial COW leading to page cache corruption

What is CVE-2026-46331?

CVE-2026-46331 is a high-severity memory corruption vulnerability in Linux kernel, published on 16 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-787, CWE-190

Which versions are affected by CVE-2026-46331?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-46331?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-46331 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46331 exists.

Public exploit code: 14 proofs of concept on GitHub.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-90107, BELL-CVE-2026-46331, DEBIAN-CVE-2026-46331, GHSA-cr2w-747q-47qc, OESA-2026-2870, RHSA-2026:27355 and 12 more.