Amazon Linux 2 (EOS) Security Advisory: ALAS2-2026-3948
Advisory Released Date: 2026-09-28
Advisory Updated Date: 2026-09-28
RustCrypto CMOV provides conditional move CPU intrinsics which are guaranteed on major platforms to execute in constant-time and not be rewritten as branches by the compiler. From 0.1.1 until 0.5.4, the aarch64 implementations of Cmov and CmovEq in cmov/src/backends/aarch64.rs assume high bits are zero-extended when loading values smaller than a register, so set high bits such as [8..] in a Cmov selector or [16..] of self or other in the u16 and i16 CmovEq implementations can cause left.cmovz(&right, condition) to produce incorrect output. This issue is fixed in version 0.5.4. (CVE-2026-50185)
Affected Packages:
amazon-efs-utils
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update amazon-efs-utils or yum update --advisory ALAS2-2026-3948 to update your system.
aarch64:
amazon-efs-utils-3.3.2-1.amzn2.aarch64
src:
amazon-efs-utils-3.3.2-1.amzn2.src
x86_64:
amazon-efs-utils-3.3.2-1.amzn2.x86_64