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Description

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.

PUBLISHED Reserved 2026-02-05 | Published 2026-03-30 | Updated 2026-04-16 | Assigner suse




MEDIUM: 5.8CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-271: Privilege Dropping / Lowering Errors

CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition

Product status

Default status
unaffected

? (git) before https://github.com/pop-os/cosmic-greeter/pull/426
affected

Credits

Matthias Gerstner of SUSE finder

References

www.openwall.com/lists/oss-security/2026/04/16/3

bugzilla.suse.com/show_bug.cgi?id=CVE-2026-25704

cve.org (CVE-2026-25704)

nvd.nist.gov (CVE-2026-25704)

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