# CVE-2026-46331 — Linux

> As of 2026-06-19, CVE-2026-46331 is a vulnerability in Linux, EPSS 0.2% (20.7th percentile). Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2026-46331, most recently “Linux Kernel act_pedit COW Out-of-Bounds Write Enables Local Privilege Escalation to Root (CVE-2026-46331)”.

**Last updated:** 2026-06-19

## What is CVE-2026-46331?

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.

1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 88 days ago.

## Severity and exploitation probability

- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 20.7% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 2.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-06-16, last modified 2026-06-19

## Is CVE-2026-46331 being exploited?

Weaponised exploit code for CVE-2026-46331 is publicly available. 3 public proof-of-concept repositories are tracked for this identifier.

- [sgkdev/packet_edit_meme](https://github.com/sgkdev/packet_edit_meme) (github)
- [0xBlackash/CVE-2026-46331](https://github.com/0xBlackash/CVE-2026-46331) (github)
- [HORKimhab/CVE-2026-46331](https://github.com/HORKimhab/CVE-2026-46331) (github)

## Affected products and versions

- **Linux**: Linux

## How to fix CVE-2026-46331

No vendor patch reference has been recorded for CVE-2026-46331 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-46331

2 tracked threats in the Threadlinqs corpus reference CVE-2026-46331, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Linux Kernel act_pedit COW Out-of-Bounds Write Enables Local Privilege Escalation to Root (CVE-2026-46331)](https://intel.threadlinqs.com/threat/TL-2026-0964) — HIGH · 2026-06-27
- [Linux Kernel act_pedit Partial Copy-on-Write Page-Cache Corruption Local Privilege Escalation (CVE-2026-46331, "pedit COW")](https://intel.threadlinqs.com/threat/TL-2026-0951) — HIGH · 2026-06-26

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-06-27. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [git.kernel.org](https://git.kernel.org/stable/c/2bec122b9fb91507a758ab5e3e5c4fbe7cb3f61b)
- [git.kernel.org (b198ed4e52580a7238c7c7082f03906f8b310313)](https://git.kernel.org/stable/c/b198ed4e52580a7238c7c7082f03906f8b310313)
- [git.kernel.org (3dee9d0c198faeb95d052c1b94c2958751a28512)](https://git.kernel.org/stable/c/3dee9d0c198faeb95d052c1b94c2958751a28512)
- [git.kernel.org (899ee91156e57784090c5565e4f31bd7dbffbc5a)](https://git.kernel.org/stable/c/899ee91156e57784090c5565e4f31bd7dbffbc5a)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-46331
Full detection coverage and IOCs for threats exploiting CVE-2026-46331 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp