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Fragnasia flaw could grant root on many Linux kernels

1 min read
Source: BleepingComputer
Fragnasia flaw could grant root on many Linux kernels
Photo: BleepingComputer
TL;DR Summary

A high-severity Linux kernel local privilege-escalation flaw, Fragnasia (CVE-2026-46300), lets an unprivileged attacker write to the kernel page cache via the XFRM ESP-in-TCP subsystem to gain root; patches are rolling out for all affected kernels, and a PoC exists. Mitigations include removing vulnerable modules esp4, esp6, and rxrpc with modprobe.d, though this can disrupt AFS and IPsec VPNs. The bug is part of the Dirty Frag family; CISA has also flagged Copy Fail as actively exploited in the wild.

Topics:technology#kernel#linux#patching#privilege-escalation#security
Share this article
  1. New Fragnesia Linux flaw lets attackers gain root privileges  BleepingComputer
  2. New Fragnesia Linux Kernel LPE Grants Root Access via Page Cache Corruption  The Hacker News
  3. Fragnesia: Linux Kernel Local Privilege Escalation via ESP-in-TCP  wiz.io
  4. How Cloudflare responded to the “Copy Fail” Linux vulnerability  The Cloudflare Blog
  5. Active attack: Dirty Frag Linux vulnerability expands post-compromise risk  Microsoft

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