Detections
Analytics

Amazon Linux 2 : docker (ALASDOCKER-2026-162)

high Nessus Plugin ID 377921

Synopsis

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

Description

The version of docker installed on the remote host is prior to 25.0.18-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2DOCKER-2026-162 advisory.

 eStargz layer decoder in the estartgz package contains a vulnerability that an input containing a cyclic hardlink crashes the process with Go's unrecoverable stack overflow error. Stargz Snapshotter with the default configuration relies on that function so pulling an eStargz image containing a muliciously crafted layer with a cyclic hardlink crashes the Stargz Snapshotter process. (CVE-2026-71482)

 When coalescing adjacent text nodes in addText and fosterParent, appending to an existing TextNode's Data via string concatenation (n.Data += text) reallocated and copied the accumulated string on every token.
 Inputs containing many short text runs separated by ignored end tags (such as a</x>) caused O(n^2) allocations and byte copies. Accumulate coalesced text in per-node byte slices during parsing and materialize Data strings once at the end of parse. (CVE-2026-78661)

 A malicious image can advertise DiffIDs from another image while containing different layer contents. In affected versions, BuildKit could use the advertised DiffIDs to derive cache and snapshot identity without validating that they matched the actual layer contents.

 If a BuildKit daemon with shared or persistent cache first processes such a malicious image, a later build using the victim image may mount the attacker-controlled layer contents as the base image. This can allow code from the malicious image to run in the victim build, for example by replacing a commonly executed path such as /bin/sh. The attacker-controlled code may read build secrets mounted into the build, access other build resources, alter output artifacts, or hang the build.

 The issue affects both regular snapshotters and lazy-pulling snapshotters such as stargz. (CVE-2026-93318)

 In childTextNodesAreLiteral, walking up the tree previously stopped at the nearest foreign ancestor once an HTML integration point was found. However, that integration point may itself be a descendant of an element that was foster-parented into a foreign namespace (such as <mglyph> or <malignmark> fostered under <mtext>), causing a parser to resolve the subtree in a different foreign namespace upon re-parsing the rendered output. Continue walking the full ancestor chain and verify that every transition from a non- empty namespace occurs at an HTML integration point before emitting literal text. (CVE-2026-97045)

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 docker' or or 'yum update --advisory ALAS2DOCKER-2026-162' to update your system.

See Also

https://alas.aws.amazon.com//AL2/ALAS2DOCKER-2026-162.html

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

https://explore.alas.aws.amazon.com/CVE-2026-71482.html

https://explore.alas.aws.amazon.com/CVE-2026-78661.html

https://explore.alas.aws.amazon.com/CVE-2026-93318.html

https://explore.alas.aws.amazon.com/CVE-2026-97045.html

Plugin Details

Severity: High

ID: 377921

File Name: al2_ALASDOCKER-2026-162.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 11/9/2026

Updated: 11/9/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.56

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-78661

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

CVSS v4

Risk Factor: High

Base Score: 7.5

Threat Score: 4.6

Threat Vector: CVSS:4.0/E:U

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

CVSS Score Source: CVE-2026-93318

Vulnerability Information

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

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/9/2026

Vulnerability Publication Date: 10/5/2026

Reference Information

CVE: CVE-2026-71482, CVE-2026-78661, CVE-2026-93318, CVE-2026-97045