ID:12861 - Exploit for Improper control of a resource through its lifetime in Linux kernel - CVE-2026-46300

Link to public exploit:

Vulnerability description

The vulnerability allows a local user to cause memory corruption.

The vulnerability exists due to improper state management in skb_try_coalesce() when transferring paged fragments during TCP receive coalescing. A local user can trigger packet processing that moves shared fragments into an unmarked skb to cause memory corruption.

The issue can lead ESP input to incorrectly treat an uncloned nonlinear skb as not having shared fragments and perform in-place decryption over externally owned or page-cache-backed fragments.

Remediation