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Amazon Linux 2 : nerdctl (ALAS-2026-3903)

medium Nessus Plugin ID 345767

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Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of nerdctl installed on the remote host is prior to 2.3.5-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3903 advisory.

 A vulnerability has been found in cilium ebpf up to 0.21.0. This affects the function loadRawSpec of the file btf/btf.go of the component LoadCollectionSpec/LoadCollectionSpecFromReader. Such manipulation of the argument offset leads to integer overflow. The attack can only be performed from a local environment. The exploit has been disclosed to the public and may be used. The name of the patch is 533dfc82fd228bfadf42ea7180c39de7d9af47fa. A patch should be applied to remediate this issue.
 (CVE-2026-10722)

 On Unix systems, opening a file in an os.Root improperly follows symlinks to locations outside of the Root when the final path component of the a path is a symbolic link and the path ends in /. For example, 'root.Open(symlink/)' will open symlink even when symlink is a symbolic link pointing outside of the root. (CVE-2026-39822)

 Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello. (CVE-2026-42505)

 Memory exhaustion DoS causing OOM kill of containerd process

 NOTE: https://github.com/containerd/containerd/security/advisories/GHSA-jpcc-p29g-p8mq (CVE-2026-47262)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update nerdctl' or or 'yum update --advisory ALAS2-2026-3903' to update your system.

See Also

https://alas.aws.amazon.com//AL2/ALAS2-2026-3903.html

https://alas.aws.amazon.com/faqs.html

https://explore.alas.aws.amazon.com/CVE-2026-10722.html

https://explore.alas.aws.amazon.com/CVE-2026-39822.html

https://explore.alas.aws.amazon.com/CVE-2026-42505.html

https://explore.alas.aws.amazon.com/CVE-2026-47262.html

Plugin Details

Severity: Medium

ID: 345767

File Name: al2_ALAS-2026-3903.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 9/14/2026

Updated: 9/14/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.19

CVSS v2

Risk Factor: Low

Base Score: 1.7

Temporal Score: 1.3

Vector: CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:P

CVSS Score Source: CVE-2026-10722

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 5

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS Score Source: CVE-2026-47262

CVSS v4

Risk Factor: Medium

Base Score: 5.3

Threat Score: 2.1

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2026-47262

Vulnerability Information

CPE: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:nerdctl-debuginfo, p-cpe:/a:amazon:linux:nerdctl

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/14/2026

Vulnerability Publication Date: 6/3/2026

Reference Information

CVE: CVE-2026-10722, CVE-2026-39822, CVE-2026-42505, CVE-2026-47262

IAVB: 2026-B-0193-S