Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-3251)

critical Nessus Plugin ID 371850

Synopsis

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

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-3251 advisory.

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

bpf: Fix UAF in sock clone early bailouts (CVE-2026-68399)

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

btrfs: initialize inode mapping flags for cached inodes (CVE-2026-80734)

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

bpf: Mark NULL kptr stores precise (CVE-2026-98034)

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

bpf: backtracking shouldn't clear outer frame R1-R5 for callbacks (CVE-2026-98084)

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

xfrm: hold net_device reference under RCU in bundle creation (CVE-2026-98364)

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

mm/hugetlb: preserve mremap address delta when skipping page tables (CVE-2026-98373)

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

tcp: fix use-after-free of retransmit_skb_hint in tcp_send_synack() (CVE-2026-98374)

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

xen/netfront: drop RX packets with a short Ethernet header (CVE-2026-98375)

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

vlan: require the MAC header to be present in __vlan_insert_inner_tag() (CVE-2026-98377)

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

bpf: Skip unsettled links in link iterator (CVE-2026-98378)

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

netfilter: ip6t_rpfilter: reject routes without inet6_dev (CVE-2026-98379)

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

net/sched: reject IDR error pointers when deleting actions (CVE-2026-98380)

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

veth: manage XDP program pointers during channel resize (CVE-2026-98381)

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

bpf: Reject dev-bound-only programs on other devices (CVE-2026-98382)

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

bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL (CVE-2026-98383)

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

bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destroy() (CVE-2026-98384)

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

ipv4: free inet_opt and ireq_opt after an RCU grace period (CVE-2026-98432)

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 kernel6.18 --releasever 2023.12.20261026' or or 'dnf update --advisory ALAS2023-2026-3251 --releasever 2023.12.20261026' to update your system.

Plugin Details

Severity: Critical

ID: 371850

File Name: al2023_ALAS2023-2026-3251.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 10/25/2026

Updated: 10/25/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.7

Percentile: 95.88

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-98432

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:bpftool6.18-debuginfo, p-cpe:/a:amazon:linux:bpftool6.18, p-cpe:/a:amazon:linux:kernel-livepatch-6.18.56-125.164, p-cpe:/a:amazon:linux:kernel6.18-debuginfo-common-aarch64, p-cpe:/a:amazon:linux:kernel6.18-debuginfo-common-x86_64, p-cpe:/a:amazon:linux:kernel6.18-debuginfo, p-cpe:/a:amazon:linux:kernel6.18-devel, p-cpe:/a:amazon:linux:kernel6.18-headers, p-cpe:/a:amazon:linux:kernel6.18-modules-extra-common, p-cpe:/a:amazon:linux:kernel6.18-modules-extra, p-cpe:/a:amazon:linux:kernel6.18-tools-debuginfo, p-cpe:/a:amazon:linux:kernel6.18-tools-devel, p-cpe:/a:amazon:linux:kernel6.18-tools, p-cpe:/a:amazon:linux:kernel6.18, p-cpe:/a:amazon:linux:microvm-kernel6.18, p-cpe:/a:amazon:linux:perf6.18-debuginfo, p-cpe:/a:amazon:linux:perf6.18, p-cpe:/a:amazon:linux:python3-perf6.18-debuginfo, p-cpe:/a:amazon:linux:python3-perf6.18

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

Exploit Ease: No known exploits are available

Patch Publication Date: 10/24/2026

Vulnerability Publication Date: 8/10/2026

Reference Information

CVE: CVE-2026-68399, CVE-2026-80734, CVE-2026-98034, CVE-2026-98084, CVE-2026-98364, CVE-2026-98373, CVE-2026-98374, CVE-2026-98375, CVE-2026-98377, CVE-2026-98378, CVE-2026-98379, CVE-2026-98380, CVE-2026-98381, CVE-2026-98382, CVE-2026-98383, CVE-2026-98384, CVE-2026-98432

Detections

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