CVE-2026-31431 "Copy Fail" Linux Kernel LPE Exploit Proof-of-Concept Released
By
cednore
An everything bagel for the brain. Substantive, layered, well-seasoned.
Summary
This article presents a proof-of-concept exploit toolkit for CVE-2026-31431 ("Copy Fail"), a Linux kernel vulnerability in the algif_aead/authencesn module that enables local privilege escalation (LPE) through page-cache scratch-write. The vulnerability was disclosed on 2026-04-29, and the toolkit includes a detector and exploit POC. The author provides a disclosure writeup link and includes legal warnings about authorized use only.
Key quotes
· 3 pulledUse only on hosts you own or are explicitly engaged to assess.
The LPE modifies in-memory state (page cache) but the technique is real privilege escalation — running it on systems without authorization is illegal in most jurisdictions.
algif_aead runs AEAD operations in-place (req->src == req->dst).
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