Amazon Linux 2023 Security Advisory: ALAS2023-2026-1986
Advisory Released Date: 2026-07-20
Advisory Updated Date: 2026-07-20
A flaw was found in the `acl` component, specifically within its `libacl` pathname-based functions. A local attacker could exploit this vulnerability by using a symbolic link to replace a pathname component. This could allow the attacker to redirect access control list (ACL) read or write operations to arbitrary files or directories, leading to unauthorized manipulation of ACLs and ultimately local privilege escalation. (CVE-2026-54369)
A time-of-check to time-of-use (TOCTOU) race condition vulnerability was found in acl. By replacing a pathname component with a symbolic link between a security check and subsequent file operations, an attacker can redirect file access control list operations. This occurs when privileged processes invoke `getfacl` or `setfacl` over an attacker-controlled path, potentially leading to local privilege escalation. (CVE-2026-54370)
Affected Packages:
acl
Issue Correction:
Run dnf update acl --releasever 2023.12.20260720 or dnf update --advisory ALAS2023-2026-1986 --releasever 2023.12.20260720 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
aarch64:
acl-debugsource-2.4.0-1.amzn2023.0.1.aarch64
libacl-debuginfo-2.4.0-1.amzn2023.0.1.aarch64
acl-debuginfo-2.4.0-1.amzn2023.0.1.aarch64
libacl-devel-2.4.0-1.amzn2023.0.1.aarch64
libacl-2.4.0-1.amzn2023.0.1.aarch64
acl-2.4.0-1.amzn2023.0.1.aarch64
src:
acl-2.4.0-1.amzn2023.0.1.src
x86_64:
acl-debugsource-2.4.0-1.amzn2023.0.1.x86_64
libacl-debuginfo-2.4.0-1.amzn2023.0.1.x86_64
acl-debuginfo-2.4.0-1.amzn2023.0.1.x86_64
libacl-2.4.0-1.amzn2023.0.1.x86_64
libacl-devel-2.4.0-1.amzn2023.0.1.x86_64
acl-2.4.0-1.amzn2023.0.1.x86_64