Amazon Linux 2023 : bpftool6.12, kernel6.12, kernel6.12-devel (ALAS2023-2025-1227)

high Nessus Plugin ID 271775

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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 ALAS2023-2025-1227 advisory.

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

bridge: mcast: Fix use-after-free during router port configuration (CVE-2025-38248)

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

net/sched: Fix backlog accounting in qdisc_dequeue_internal (CVE-2025-39677)

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

net/mlx5: HWS, Fix memory leak in hws_pool_buddy_init error path (CVE-2025-39830)

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

mm/damon/sysfs: fix use-after-free in state_show() (CVE-2025-39877)

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

libceph: fix invalid accesses to ceph_connection_v1_info (CVE-2025-39880)

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

kernfs: Fix UAF in polling when open file is released (CVE-2025-39881)

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

mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memory (CVE-2025-39883)

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

btrfs: fix subvolume deletion lockup caused by inodes xarray race (CVE-2025-39884)

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

bpf: Tell memcg to use allow_spinning=false path in bpf_timer_init() (CVE-2025-39886)

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

mm/damon/lru_sort: avoid divide-by-zero in damon_lru_sort_apply_parameters() (CVE-2025-39909)

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

nfs/localio: restore creds before releasing pageio data (CVE-2025-39912)

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

tcp_bpf: Call sk_msg_free() when tcp_bpf_send_verdict() fails to allocate psock->cork. (CVE-2025-39913)

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

tracing: Silence warning when chunk allocation fails in trace_pid_write (CVE-2025-39914)

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

mm/damon/reclaim: avoid divide-by-zero in damon_reclaim_apply_parameters() (CVE-2025-39916)

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

bpf: Fix out-of-bounds dynptr write in bpf_crypto_crypt (CVE-2025-39917)

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

genetlink: fix genl_bind() invoking bind() after -EPERM (CVE-2025-39926)

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

ceph: fix race condition validating r_parent before applying state (CVE-2025-39927)

In the Linux kernel, the following vulnerability has been resolved:x86/vmscape: Add conditional IBPB mitigation

VMSCAPE is a vulnerability that exploits insufficient branch predictor isolation between a guest and a userspace hypervisor (like QEMU). Existing mitigations already protect kernel/KVM from a malicious guest.
Userspace can additionally be protected by flushing the branch predictors after a VMexit.

Since it is the userspace that consumes the poisoned branch predictors, conditionally issue an IBPB after a VMexit and before returning to userspace. Workloads that frequently switch between hypervisor and userspace will incur the most overhead from the new IBPB.

This new IBPB is not integrated with the existing IBPB sites. For instance, a task can use the existing speculation control prctl() to get an IBPB at context switch time. With this implementation, the IBPB is doubled up: one at context switch and another before running userspace. The intent is to integrate and optimize these cases post-embargo.[ dhansen: elaborate on suboptimal IBPB solution ] (CVE-2025-40300)

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 kernel6.12 --releasever 2023.9.20251027' or or 'dnf update --advisory ALAS2023-2025-1227 --releasever 2023.9.20251027' to update your system.

Plugin Details

Severity: High

ID: 271775

File Name: al2023_ALAS2023-2025-1227.nasl

Version: 1.2

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 10/28/2025

Updated: 12/8/2025

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: 5.3

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

CVSS Score Source: CVE-2025-38248

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7

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:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:python3-perf6.12, p-cpe:/a:amazon:linux:kernel6.12, p-cpe:/a:amazon:linux:kernel6.12-modules-extra, p-cpe:/a:amazon:linux:kernel6.12-debuginfo, p-cpe:/a:amazon:linux:kernel6.12-debuginfo-common-x86_64, p-cpe:/a:amazon:linux:perf6.12, p-cpe:/a:amazon:linux:perf6.12-debuginfo, p-cpe:/a:amazon:linux:kernel6.12-debuginfo-common-aarch64, p-cpe:/a:amazon:linux:python3-perf6.12-debuginfo, p-cpe:/a:amazon:linux:bpftool6.12, p-cpe:/a:amazon:linux:bpftool6.12-debuginfo, p-cpe:/a:amazon:linux:kernel6.12-devel, p-cpe:/a:amazon:linux:kernel6.12-headers, p-cpe:/a:amazon:linux:kernel6.12-libbpf, p-cpe:/a:amazon:linux:kernel6.12-libbpf-debuginfo, p-cpe:/a:amazon:linux:kernel6.12-libbpf-devel, p-cpe:/a:amazon:linux:kernel6.12-libbpf-static, p-cpe:/a:amazon:linux:kernel6.12-modules-extra-common, p-cpe:/a:amazon:linux:kernel6.12-tools, p-cpe:/a:amazon:linux:kernel6.12-tools-debuginfo, p-cpe:/a:amazon:linux:kernel6.12-tools-devel, p-cpe:/a:amazon:linux:kernel-livepatch-6.12.48-67.114

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: 10/27/2025

Vulnerability Publication Date: 7/9/2025

Reference Information

CVE: CVE-2025-38248, CVE-2025-39677, CVE-2025-39830, CVE-2025-39877, CVE-2025-39880, CVE-2025-39881, CVE-2025-39883, CVE-2025-39884, CVE-2025-39886, CVE-2025-39909, CVE-2025-39912, CVE-2025-39913, CVE-2025-39914, CVE-2025-39916, CVE-2025-39917, CVE-2025-39926, CVE-2025-39927, CVE-2025-40300

Detections

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