CVE-2026-61897

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.

Scoring

Severity

HIGH

CVSS base score

7.8

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability

0.10%

CWE

CWE-273

Published

2026-08-20

Last modified

2026-08-26

Affected products

• Canonical accountsservice
• Canonical accountsservice
• Canonical accountsservice
• Canonical accountsservice

Weakness type

• CWE-273

Related vulnerabilities

• CVE-2026-58089 — hwpmc fails to detach PMCs during exec credential transitions
• CVE-2026-58086 — ktrace(2) privilege incorrectly validated in jails
• CVE-2026-49421 — unlinkat(2) ignores AT_RESOLVE_BENEATH flag
• CVE-2026-54552 — sh _uid does not drop supplementary groups (incomplete privilege drop)
• CVE-2026-60085 — PraisonAI before 4.6.78 Unenforced Security Policy in Subprocess Sandbox
• CVE-2026-44073 — seteuid failure ignored in auth modules
• CVE-2026-32107 — xrdp: Fail-open privilege drop in sesexec — child processes may execute as root if setuid fails
• CVE-2026-21882 — theshit's Improper Privilege Dropping Allows Local Privilege Escalation via Command Re-execution

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