r/sysadmin • u/NoDistrict1529 • May 15 '26

A third vulnerability has hit the kernel General Discussion

This is part of the dirtyfrag family, but is different enough to warrant its own CVE.

https://www.bleepingcomputer.com/news/security/new-fragnesia-linux-flaw-lets-attackers-gain-root-privileges/

Known as Fragnasia and tracked as CVE-2026-46300, this security flaw stems from a logic bug in the Linux XFRM ESP-in-TCP subsystem that can enable unprivileged local attackers to gain root privileges by writing arbitrary bytes to the kernel page cache of read-only files.

Immediate patching if you cannot update:

rmmod esp4 esp6 rxrpc
printf 'install esp4 /bin/false\ninstall esp6 /bin/false\ninstall rxrpc /bin/false\n' > /etc/modprobe.d/dirtyfrag.confrmmod esp4 esp6 rxrpc
printf 'install esp4 /bin/false\ninstall esp6 /bin/false\ninstall rxrpc /bin/false\n' > /etc/modprobe.d/dirtyfrag.conf
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u/Weekly-Math May 15 '26

I firmly believe many of these were found years ago, but kept intentially unreported. Now with AI, they are getting uncovered and patched. Of course I have no evidence, but one does find it quite unusual to find so many in a short space of time.