pop-os cosmic-greeter privilege dropping

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.3$0-$5k4.02-

Summaryinfo

A vulnerability has been found in pop-os cosmic-greeter and classified as problematic. Impacted is an unknown function. The manipulation leads to privilege dropping. This vulnerability is documented as CVE-2026-25704. The attack needs to be performed locally. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in pop-os cosmic-greeter (the affected version unknown). This issue affects an unknown part. The manipulation with an unknown input leads to a privilege dropping vulnerability. Using CWE to declare the problem leads to CWE-271. The product does not drop privileges before passing control of a resource to an actor that does not have those privileges. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was released by Matthias Gerstner. The advisory is shared at bugzilla.suse.com. The identification of this vulnerability is CVE-2026-25704 since 02/05/2026. The exploitation is known to be difficult. An attack has to be approached locally. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading eliminates this vulnerability. Applying the patch 426 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-17067). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.3

VulDB Base Score: 4.5
VulDB Temp Score: 4.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Privilege dropping
CWE: CWE-271 / CWE-270 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Patch: 426

Timelineinfo

02/05/2026 CVE reserved
03/30/2026 +52 days Advisory disclosed
03/30/2026 +0 days VulDB entry created
03/30/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: bugzilla.suse.com
Researcher: Matthias Gerstner
Status: Confirmed

CVE: CVE-2026-25704 (🔒)
GCVE (CVE): GCVE-0-2026-25704
GCVE (VulDB): GCVE-100-354161
EUVD: 🔒

Entryinfo

Created: 03/30/2026 11:57
Updated: 03/30/2026 12:05
Changes: 03/30/2026 11:57 (66), 03/30/2026 12:05 (1)
Complete: 🔍
Cache ID: 216:8A0:103

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