Amazon Linux 2 : kernel (ALAS-2025-2843)

high Nessus Plugin ID 235023

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Synopsis

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

Description

The version of kernel installed on the remote host is prior to 4.14.355-276.639. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2025-2843 advisory.

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

nbd: Fix NULL pointer in flush_workqueue (CVE-2021-46981)

A use-after-free flaw was found in btrfs_search_slot in fs/btrfs/ctree.c in btrfs in the Linux Kernel.This flaw allows an attacker to crash the system and possibly cause a kernel information lea (CVE-2023-1611)

nftables out-of-bounds read in nf_osf_match_one() (CVE-2023-39189)

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

bonding: stop the device in bond_setup_by_slave() (CVE-2023-52784)

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

scsi: iscsi_tcp: Fix UAF during logout when accessing the shost ipaddress (CVE-2023-52975)

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

mm: call the security_mmap_file() LSM hook in remap_file_pages() (CVE-2024-47745)

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

ext4: fix double brelse() the buffer of the extents path (CVE-2024-49882)

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

net: do not delay dst_entries_add() in dst_release() (CVE-2024-50036)

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

dm cache: fix potential out-of-bounds access on the first resume (CVE-2024-50278)

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

security/keys: fix slab-out-of-bounds in key_task_permission (CVE-2024-50301)

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

ipv6: mcast: extend RCU protection in igmp6_send() (CVE-2025-21759)

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

vrf: use RCU protection in l3mdev_l3_out() (CVE-2025-21791)

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

nfsd: clear acl_access/acl_default after releasing them (CVE-2025-21796)

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

geneve: Fix use-after-free in geneve_find_dev(). (CVE-2025-21858)

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

x86/microcode/AMD: Fix out-of-bounds on systems with CPU-less NUMA nodes (CVE-2025-21991)

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 kernel' to update your system.

Plugin Details

Severity: High

ID: 235023

File Name: al2_ALAS-2025-2843.nasl

Version: 1.2

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 4/30/2025

Updated: 5/21/2025

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

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2025-21991

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:kernel-livepatch-4.14.355-276.639, p-cpe:/a:amazon:linux:perf, p-cpe:/a:amazon:linux:perf-debuginfo, p-cpe:/a:amazon:linux:kernel-tools-debuginfo, p-cpe:/a:amazon:linux:kernel-debuginfo-common-aarch64, p-cpe:/a:amazon:linux:kernel-tools, p-cpe:/a:amazon:linux:kernel-devel, p-cpe:/a:amazon:linux:python-perf-debuginfo, p-cpe:/a:amazon:linux:kernel, p-cpe:/a:amazon:linux:kernel-debuginfo, p-cpe:/a:amazon:linux:kernel-headers, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:kernel-tools-devel, p-cpe:/a:amazon:linux:kernel-debuginfo-common-x86_64, p-cpe:/a:amazon:linux:python-perf

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

Exploit Ease: No known exploits are available

Patch Publication Date: 4/23/2025

Vulnerability Publication Date: 3/12/2025

Reference Information

CVE: CVE-2021-46981, CVE-2023-1611, CVE-2023-39189, CVE-2023-52784, CVE-2023-52975, CVE-2024-47745, CVE-2024-49882, CVE-2024-50036, CVE-2024-50278, CVE-2024-50301, CVE-2025-21759, CVE-2025-21791, CVE-2025-21796, CVE-2025-21858, CVE-2025-21991

Detections

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