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CVE-2026-61897— accountsservice: incomplete privilege drop when running Ubuntu-specific language helper scripts

Quick assessment

Affected
Canonical accountsservice
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

该漏洞描述信息的中文翻译如下： Ubuntu 专属补丁对 AccountsService（版本低于 23.13.9-8ubuntu7）进行修复时，仅在启动语言辅助脚本前部分地降低了权限。该补丁将进程的有效用户 ID（effective UID）和有效组 ID（effective GID）更改为目标用户，但保留实际用户 ID（real UID）为 0（即 root 权限）。由辅助脚本生成的 shell 会继承 ruid=0，并可能将其有效用户 ID 重置为 root，从而导致本地权限提升。

CVSS 7.8 · High EPSS 0.10% · P1

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 4

VendorProduct Version RangeStatus
Canonical accountsservice 22.07.5-2ubuntu1< 22.07.5-2ubuntu1.6 affected
23.13.9-2ubuntu6< 23.13.9-2ubuntu6.1 affected
23.13.9-8ubuntu5< 23.13.9-8ubuntu5.2 affected
23.13.9-8ubuntu6< 23.13.9-8ubuntu7 affected
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I. Basic Information for CVE-2026-61897

Vulnerability Information
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Vulnerability Title
accountsservice: incomplete privilege drop when running Ubuntu-specific language helper scripts
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对于放弃特权的检查不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Canonical accountsservice 22.07.5-2ubuntu1 ~ 22.07.5-2ubuntu1.6 -

II. Public POCs for CVE-2026-61897

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III. Intelligence Information for CVE-2026-61897

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Vendor Advisories for CVE-2026-61897 (2)

Same Patch Batch · Canonical · 2026-08-20 · 3 CVEs total

CVE-2026-61898 7.8 HIGH accountsservice: shell injection via attacker-controlled ~/.pam_environment in Ubuntu lang
CVE-2026-77113 6.7 MEDIUM Path Traversal Vulnerability in apport-unpack

IV. Related Vulnerabilities

Same product: accountsservice
Same vendor: Canonical
Same weakness: CWE-273

V. Comments for CVE-2026-61897

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