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 134 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. It currently carries a trending score of 50 in the Threadlinqs vulnerability feed.
- sgkdev/packet_edit_meme (github)
- 0xBlackash/CVE-2026-46331 (github)
- 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
4 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.
- CitrixBleed 2 (CVE-2025-5777) Exploited by Anubis Ransomware Affiliates Alongside Valid VPN Credentials and RMM Tool Abuse — CRITICAL · 2026-10-27
- Q2 2026 Vulnerability and Exploit Landscape: Exploited AI-platform flaws (OpenClaw CVE-2026-25253, Dify CVE-2026-41948, Open WebUI CVE-2026-45386), Exchange CVE-2026-45501, and Linux kernel page-cache LPE exploit wave (Copy Fail, Dirty Frag) — HIGH · 2026-10-20
- Linux Kernel act_pedit COW Out-of-Bounds Write Enables Local Privilege Escalation to Root (CVE-2026-46331) — HIGH · 2026-06-27
- Linux Kernel act_pedit Partial Copy-on-Write Page-Cache Corruption Local Privilege Escalation (CVE-2026-46331, "pedit COW") — 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 . This product uses the NVD API but is not endorsed or certified by the NVD.