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Linux kernel XFRM ESP-in-TCP local privilege escalation (CVE-2026-46300)

Vulnerability
First reported
Last updated
Happening score
H score 35
2 unique sources, 2 articles

Summary

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Fragnesia adds a fresh Linux kernel local privilege-escalation path, putting unprivileged local attackers on a route to root access across major distributions. The flaw is tracked as CVE-2026-46300 and sits in the kernel's XFRM ESP-in-TCP subsystem, where it enables deterministic page-cache corruption. Multiple vendors have issued advisories, a patch is available, and a proof-of-concept exploit has already been released. No in-the-wild exploitation has been observed yet, but the bug's read-only file tampering and privilege-escalation impact make it urgent for exposed Linux systems.

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Public Sector Action
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Advisory/Mitigation
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Open Happening

Timeline

  1. 14.05.2026 16:00 2 articles · 1mo ago

    Fragnesia disclosed with public PoC

    Initial Disclosure

    Cloud security firm Wiz identified Fragnesia (CVE-2026-46300) in the Dirty Frag family, a Linux local privilege escalation that lets unprivileged local users gain root by corrupting the kernel page cache of read-only files. William Bowling of Zellic and the V12 team were credited with the discovery, and a working proof-of-concept exploit was published on May 13, 2026.

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  2. 14.05.2026 16:00 1 articles · 1mo ago

    Candidate fix and interim defenses emerge

    Mitigation Patch Update

    A candidate upstream fix for Fragnesia was submitted to the netdev mailing list on May 13, 2026, while mainline Linux had not yet merged the patch. Several Linux distributions began shipping backported fixes, and administrators who had disabled esp4, esp6, and rxrpc as a Dirty Frag workaround were also covered against Fragnesia until patched kernels were available.

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  3. 14.05.2026 10:06 2 articles · 1mo ago

    Fragnesia CVE-2026-46300 disclosure and patch guidance

    Initial Disclosure

    Fragnesia is disclosed as a new Linux kernel local privilege escalation vulnerability, tracked as CVE-2026-46300 with a CVSS score of 7.8, in the XFRM ESP-in-TCP subsystem. Researchers say unprivileged local attackers can modify read-only file contents in the kernel page cache and gain root privileges, while vendors including AlmaLinux, Amazon Linux, CloudLinux, Debian, Gentoo, Red Hat Enterprise Linux, SUSE, and Ubuntu have issued advisories and a patch is available alongside Dirty Frag-style mitigations.

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  4. 14.05.2026 10:06 2 articles · 1mo ago

    Fragnesia CVE-2026-46300 disclosure and patch guidance

    Initial Disclosure

    Fragnesia is disclosed as a new Linux kernel local privilege escalation vulnerability, tracked as CVE-2026-46300 with a CVSS score of 7.8, in the XFRM ESP-in-TCP subsystem. Researchers say unprivileged local attackers can modify read-only file contents in the kernel page cache and gain root privileges, while vendors including AlmaLinux, Amazon Linux, CloudLinux, Debian, Gentoo, Red Hat Enterprise Linux, SUSE, and Ubuntu have issued advisories and a patch is available alongside Dirty Frag-style mitigations.

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