CVE-2026-25704 | pop-os cosmic-greeter privilege dropping (ID 426 / EUVD-2026-17067)

VDB-354161 · CVE-2026-25704 · EUVD-2026-17067 POP-OS COSMIC-GREETER PRIVILEGE DROPPING HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.3 $0-$5k 2.91+ 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). Productinfo Vendor pop-os Name cosmic-greeter Website Product: https://github.com/pop-os/cosmic-greeter/ 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 Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock 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 Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock 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: 99:B3C:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸