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CVE-2026-54370— acl < 2.4.0 TOCTOU Symlink Traversal via getfacl/setfacl/chacl

Quick assessment

Affected
acl project acl
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.

ACL ACL是ACL组织开源的一款用于实现访问控制与权限管理的安全权限控制框架。 acl 2.4.0之前版本存在竞争条件问题漏洞，该漏洞源于TOCTOU竞争条件问题，允许本地攻击者通过替换lstat()检查与后续符号链接跟踪操作之间的路径名组件为符号链接，从而在特权进程在攻击者控制的路径上调用getfacl、setfacl或chacl时重定向文件访问控制列表操作，导致本地权限提升。

CVSS 6.3 · Medium EPSS 0.11% · P1

Affected Version Matrix 1

VendorProduct Version RangeStatus
acl project acl < 2.4.0 affected
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I. Basic Information for CVE-2026-54370

Vulnerability Information
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Vulnerability Title
acl < 2.4.0 TOCTOU Symlink Traversal via getfacl/setfacl/chacl
Source: CVE Program / CVE List V5
Vulnerability Description
acl before version 2.4.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability that allows local attackers to escalate privileges by replacing a pathname component with a symbolic link between an lstat() check and subsequent symlink-following operations such as stat(), chown(), chmod(), acl_get_file(), and acl_set_file(). Attackers who control a pathname component can redirect file access control list operations to arbitrary files when getfacl, setfacl, or chacl is invoked by a privileged process over an attacker-controlled path, resulting in local privilege escalation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
ACL 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ACL ACL是ACL组织开源的一款用于实现访问控制与权限管理的安全权限控制框架。 acl 2.4.0之前版本存在竞争条件问题漏洞，该漏洞源于TOCTOU竞争条件问题，允许本地攻击者通过替换lstat()检查与后续符号链接跟踪操作之间的路径名组件为符号链接，从而在特权进程在攻击者控制的路径上调用getfacl、setfacl或chacl时重定向文件访问控制列表操作，导致本地权限提升。
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

Vendor Product Affected Versions CPE Subscribe
acl project acl 0 ~ 2.4.0 -

II. Public POCs for CVE-2026-54370

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III. Intelligence Information for CVE-2026-54370

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Patches & Fixes for CVE-2026-54370 (2)

Vendor Advisories for CVE-2026-54370 (1)

IV. Related Vulnerabilities

Same product: acl
Same vendor: acl project
Same weakness: CWE-367

V. Comments for CVE-2026-54370

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