CVE-2026-46331
ANALYSIS PENDINGnet/sched: fix pedit partial COW leading to page cache corruption
Title source: cnaExploitation Summary
EIP tracks 1 public exploit for CVE-2026-46331. PoCs published by sgkdev.
AI-analyzed exploit summary This repository contains a functional exploit for CVE-2026-46331, a local privilege escalation vulnerability in the Linux kernel. The exploit leverages a page-cache overwrite primitive via tc-pedit actions to corrupt the ELF entry point of a setuid-root binary (e.g., su), achieving root access from an unprivileged user.
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.
Exploits (1)
This repository contains a functional exploit for CVE-2026-46331, a local privilege escalation vulnerability in the Linux kernel. The exploit leverages a page-cache overwrite primitive via tc-pedit actions to corrupt the ELF entry point of a setuid-root binary (e.g., su), achieving root access from an unprivileged user.