EUVD-2026-17067
GHSA-h5vx-6jh5-qhq7
CVSS Vector
CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3Description
A Privilege Dropping / Lowering Errors/Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in cosmic-greeter can allow an attacker to regain privileges that should have been dropped and abuse them in the racy checking logic. This issue affects cosmic-greeter before https://github.Com/pop-os/cosmic-greeter/pull/426.
Analysis
Cosmic-greeter before PR #426 contains a privilege dropping race condition vulnerability (CWE-271) that allows local attackers to regain dropped privileges through TOCTOU timing manipulation during privilege validation checks. The vulnerability affects the Pop!_OS greeter application and could enable privilege escalation to perform actions with elevated permissions that should have been restricted.
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