CVE-2022-46174: Race condition during concurrent TLS mounts in efs-utils

Severity: medium (CVSS 4.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-12-28 · updated 2026-06-17
Weakness: CWE-362

Description

efs-utils is a set of Utilities for Amazon Elastic File System (EFS). A potential race condition issue exists within the Amazon EFS mount helper in efs-utils versions v1.34.3 and below. When using TLS to mount file systems, the mount helper allocates a local port for stunnel to receive NFS connections prior to applying the TLS tunnel. In affected versions, concurrent mount operations can allocate the same local port, leading to either failed mount operations or an inappropriate mapping from an EFS customer’s local mount points to that customer’s EFS file systems. This issue is patched in version v1.34.4. There is no recommended work around. We recommend affected users update the installed version of efs-utils to v1.34.4 or later.

Affected products

aws efs-utils: before 1.34.4 — fixed in 1.34.4
Amazon Elastic File System Container Storage Interface Driver: before 1.4.8 — fixed in 1.4.8

How to fix

Upgrade to a fixed version: aws efs-utils 1.34.4; Amazon Elastic File System Container Storage Interface Driver 1.4.8. Check the vendor advisory for mitigations.

References

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