Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2026-1694)

high Nessus Plugin ID 313519

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Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1694 advisory.

In the Linux kernel, the following vulnerability has been resolved:

net/tls: fix use-after-free in -EBUSY error path of tls_do_encryption (CVE-2026-31533)

In the Linux kernel, the following vulnerability has been resolved:

x86/CPU: Fix FPDSS on Zen1 (CVE-2026-31628)

In the Linux kernel, the following vulnerability has been resolved:

rxrpc: fix reference count leak in rxrpc_server_keyring() (CVE-2026-31634)

In the Linux kernel, the following vulnerability has been resolved:

drm/i915/gt: fix refcount underflow in intel_engine_park_heartbeat (CVE-2026-31656)

In the Linux kernel, the following vulnerability has been resolved:

tipc: fix bc_ackers underflow on duplicate GRP_ACK_MSG (CVE-2026-31662)

In the Linux kernel, the following vulnerability has been resolved:

xfrm: clear trailing padding in build_polexpire() (CVE-2026-31664)

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nft_ct: fix use-after-free in timeout object destroy (CVE-2026-31665)

In the Linux kernel, the following vulnerability has been resolved:

Input: uinput - fix circular locking dependency with ff-core (CVE-2026-31667)

In the Linux kernel, the following vulnerability has been resolved:

seg6: separate dst_cache for input and output paths in seg6 lwtunnel (CVE-2026-31668)

In the Linux kernel, the following vulnerability has been resolved:

mptcp: fix slab-use-after-free in __inet_lookup_established (CVE-2026-31669)

In the Linux kernel, the following vulnerability has been resolved:

xfrm_user: fix info leak in build_report() (CVE-2026-31671)

In the Linux kernel, the following vulnerability has been resolved:

EDAC/mc: Fix error path ordering in edac_mc_alloc() (CVE-2026-31689)

In the Linux kernel, the following vulnerability has been resolved:

Buffer overflow in drivers/xen/sys-hypervisor.c (CVE-2026-31786)

In the Linux kernel, the following vulnerability has been resolved:

xen/privcmd: fix double free via VMA splitting (CVE-2026-31787)

In the Linux kernel, the following vulnerability has been resolved:xfrm: esp: avoid in-place decrypt on shared skb frags

Dirty Frag and other issues in Amazon Linux kernels:https://aws.amazon.com/security/security- bulletins/2026-027-aws/ (CVE-2026-43284)

In the Linux kernel, the following vulnerability has been resolved:

lib/crypto: chacha: Zeroize permuted_state before it leaves scope (CVE-2026-43336)

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 'dnf update kernel --releasever 2023.11.20260509' or or 'dnf update --advisory ALAS2023-2026-1694 --releasever 2023.11.20260509' to update your system.

Plugin Details

Severity: High

ID: 313519

File Name: al2023_ALAS2023-2026-1694.nasl

Version: 1.6

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 5/9/2026

Updated: 5/26/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 10.0

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

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

CVSS Score Source: CVE-2026-31787

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:kernel-modules-extra-common, p-cpe:/a:amazon:linux:perf-debuginfo, p-cpe:/a:amazon:linux:kernel-modules-extra, p-cpe:/a:amazon:linux:kernel-debuginfo-common-aarch64, p-cpe:/a:amazon:linux:kernel-tools, p-cpe:/a:amazon:linux:python3-perf, p-cpe:/a:amazon:linux:kernel-debuginfo, p-cpe:/a:amazon:linux:bpftool-debuginfo, p-cpe:/a:amazon:linux:kernel-headers, p-cpe:/a:amazon:linux:kernel-tools-devel, p-cpe:/a:amazon:linux:kernel-livepatch-6.1.170-210.320, cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:perf, p-cpe:/a:amazon:linux:bpftool, p-cpe:/a:amazon:linux:kernel-tools-debuginfo, p-cpe:/a:amazon:linux:kernel-devel, p-cpe:/a:amazon:linux:kernel, p-cpe:/a:amazon:linux:python3-perf-debuginfo, p-cpe:/a:amazon:linux:kernel-debuginfo-common-x86_64

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: 5/9/2026

Vulnerability Publication Date: 5/8/2026

Exploitable With

Core Impact

Metasploit (xfrm-ESP Page-Cache Write via CVE-2026-43284)

Reference Information

CVE: CVE-2026-31533, CVE-2026-31628, CVE-2026-31634, CVE-2026-31656, CVE-2026-31662, CVE-2026-31664, CVE-2026-31665, CVE-2026-31667, CVE-2026-31668, CVE-2026-31669, CVE-2026-31671, CVE-2026-31689, CVE-2026-31786, CVE-2026-31787, CVE-2026-43284, CVE-2026-43336

Detections

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