CVE-2026-25704 PUBLISHED

Incomplete privilege drop for com.system76.CosmicGreeter.GetUserData

Assigner: suse
Reserved: 05.02.2026 Published: 30.03.2026 Updated: 30.03.2026

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.

Metrics

CVSS 4.0

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
CVSS Score: 5.8

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Local	Confidentiality	Low	Confidentiality	None
Attack Complexity	High	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	pop-os
Product	cosmic-greeter
Versions	Default: unaffected affected from ? to https://github.com/pop-os/cosmic-greeter/pull/426 (excl.)

Credits

Matthias Gerstner of SUSE finder

References

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

Problem Types

CWE-271: Privilege Dropping / Lowering Errors CWE
CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition CWE