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I. Basic Information for CVE-2026-25704
Vulnerability Information

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Vulnerability Title
Incomplete privilege drop for com.system76.CosmicGreeter.GetUserData
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
特权放弃/降低错误
Source: NVD (National Vulnerability Database)
Vulnerability Title
cosmic-greeter 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
cosmic-greeter是Pop!_OS开源的一个登录管理器。 cosmic-greeter存在安全漏洞,该漏洞源于特权丢弃或降低错误以及竞争条件,可能导致攻击者重新获取已丢弃的特权并在竞争检查逻辑中滥用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
pop-oscosmic-greeter ? ~ https://github.com/pop-os/cosmic-greeter/pull/426 -
II. Public POCs for CVE-2026-25704
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III. Intelligence Information for CVE-2026-25704
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IV. Related Vulnerabilities
V. Comments for CVE-2026-25704

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