CVE-2026-61897
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
An Ubuntu-specific patch to AccountsService before 23.13.9-8ubuntu7 only partially drops privileges before launching language helper scripts. It changes the effective UID/GID to the target user but leaves the real UID as 0 (root). A shell spawned by a helper script inherits ruid=0 and may reset its effective UID to root, enabling local privilege escalation.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Canonical | accountsservice | 22.07.5-2ubuntu1 < 22.07.5-2ubuntu1.6 | affected |
| Canonical | accountsservice | 23.13.9-2ubuntu6 < 23.13.9-2ubuntu6.1 | affected |
| Canonical | accountsservice | 23.13.9-8ubuntu5 < 23.13.9-8ubuntu5.2 | affected |
| Canonical | accountsservice | 23.13.9-8ubuntu6 < 23.13.9-8ubuntu7 | affected |
Weaknesses
- CWE-273: CWE-273: Improper Check for Dropped Privileges
References
- https://bugs.launchpad.net/ubuntu/+source/accountsservice/+bug/2157985
- https://ubuntu.com/security/CVE-2026-61897
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