MEDIUMVulnerability
Global

Another Universal Linux Local Privilege Escalation (LPE) Vulnerability: Dirty Frag, (Fri, May 8th)

·Source: SANS ISC

Updated:

Executive Summary

Less than two weeks after the public disclosure of the Copy Fail vulnerability (CVE-2026-31431), another local privilege escalation (LPE) vulnerability in the Linux kernel has been revealed. Referred to as "Dirty Frag," this vulnerability was discovered and reported by Hyunwoo Kim (@v4bel) [1]. In this diary, I will provide a brief background on Dirty Frag, and discuss its relations

Analysis

Less than two weeks after the public disclosure of the Copy Fail vulnerability (CVE-2026-31431), another local privilege escalation (LPE) vulnerability in the Linux kernel has been revealed. Referred to as "Dirty Frag," this vulnerability was discovered and reported by Hyunwoo Kim (@v4bel) [1]. In this diary, I will provide a brief background on Dirty Frag, and discuss its relationship to Copy Fail. I will then discuss how to mitigate Dirty Frag and outline recommended next steps for system owners.

Indicators of Compromise (1)

CVE (1)
CVE-2026-31431
NVDMITRE CVE
Source Attribution

Originally published by SANS ISC on May 8, 2026.

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