Amazon Linux 2 : kernel (ALASKERNEL-5.15-2025-072)

high Nessus Plugin ID 237508

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 5.15.182-123.190. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2KERNEL-5.15-2025-072 advisory.

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

scsi: target: Fix WRITE_SAME No Data Buffer crash

In newer version of the SBC specs, we have a NDOB bit that indicates thereis no data buffer that gets written out. If this bit is set using commandslike sg_write_same --ndob we will crash in target_core_iblock/file'sexecute_write_same handlers when we go to access the se_cmd->t_data_sgbecause its NULL.

This patch adds a check for the NDOB bit in the common WRITE SAME codebecause we don't support it. And, it adds a check for zero SG elements ineach handler in case the initiator tries to send a normal WRITE SAME withno data buffer. (CVE-2022-21546)

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

drm/i915/gt: Cleanup partial engine discovery failures (CVE-2022-48893)

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

cifs: Fix UAF in cifs_demultiplex_thread() (CVE-2023-52572)

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

bpf: Check rcu_read_lock_trace_held() before calling bpf map helpers (CVE-2023-52621)

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

smb: client: fix use-after-free bug in cifs_debug_data_proc_show() (CVE-2023-52752)

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

smb: client: fix potential deadlock when releasing mids (CVE-2023-52757)

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

fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats (CVE-2024-26686)

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

net/sched: act_mirred: don't override retval if we already lost the skb (CVE-2024-26739)

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

smb: client: fix potential UAF in cifs_dump_full_key() (CVE-2024-35866)

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

smb: client: fix potential UAF in cifs_stats_proc_show() (CVE-2024-35867)

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

blk-iocost: do not WARN if iocg was already offlined (CVE-2024-36908)

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

of: module: add buffer overflow check in of_modalias() (CVE-2024-38541)

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

smb/server: fix potential null-ptr-deref of lease_ctx_info in smb2_open() (CVE-2024-46742)

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

net: mana: Fix error handling in mana_create_txq/rxq's NAPI cleanup (CVE-2024-46784)

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

smb: client: fix UAF in async decryption (CVE-2024-50047)

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

net: fix crash when config small gso_max_size/gso_ipv4_max_size (CVE-2024-50258)

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

filemap: Fix bounds checking in filemap_read() (CVE-2024-50272)

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

dm cache: fix flushing uninitialized delayed_work on cache_ctr error (CVE-2024-50280)

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

sched/task_stack: fix object_is_on_stack() for KASAN tagged pointers (CVE-2024-53128)

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

wifi: ath10k: avoid NULL pointer error during sdio remove (CVE-2024-56599)

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

ipv6: release nexthop on device removal

The CI is hitting some aperiodic hangup at device removal time in thepmtu.sh self-test:

unregister_netdevice: waiting for veth_A-R1 to become free. Usage count = 6ref_tracker:
veth_A-R1@ffff888013df15d8 has 1/5 users atdst_init+0x84/0x4a0dst_alloc+0x97/0x150ip6_dst_alloc+0x23/0x90i p6_rt_pcpu_alloc+0x1e6/0x520ip6_pol_route+0x56f/0x840fib6_rule_lookup+0x334/0x630ip6_route_output_flags+0x 259/0x480ip6_dst_lookup_tail.constprop.0+0x5c2/0x940ip6_dst_lookup_flow+0x88/0x190udp_tunnel6_dst_lookup+0 x2a7/0x4c0vxlan_xmit_one+0xbde/0x4a50 [vxlan]vxlan_xmit+0x9ad/0xf20 [vxlan]dev_hard_start_xmit+0x10e/0x360
__dev_queue_xmit+0xf95/0x18c0arp_solicit+0x4a2/0xe00neigh_probe+0xaa/0xf0

While the first suspect is the dst_cache, explicitly tracking the dstowing the last device reference via probes proved such dst is held bythe nexthop in the originating fib6_info.

Similar to commit f5b51fe804ec (ipv6: route: purge exception onremoval), we need to explicitly release the originating fib info whendisconnecting a to-be-removed device from a live ipv6 dst: move thefib6_info cleanup into ip6_dst_ifdown().

Tested running:

./pmtu.sh cleanup_ipv6_exception

in a tight loop for more than 400 iterations with no spat, running anunpatched kernel I observed a splat every ~10 iterations. (CVE-2024-56751)

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

bpf: avoid holding freeze_mutex during mmap operation (CVE-2025-21853)

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

nvme-tcp: fix potential memory corruption in nvme_tcp_recv_pdu() (CVE-2025-21927)

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: 237508

File Name: al2_ALASKERNEL-5_15-2025-072.nasl

Version: 1.1

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 5/29/2025

Updated: 5/29/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

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-2025-21927

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:perf, p-cpe:/a:amazon:linux:bpftool, 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-livepatch-5.15.182-123.190, 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:bpftool-debuginfo, 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: 5/29/2025

Vulnerability Publication Date: 1/9/2024

Reference Information

CVE: CVE-2022-21546, CVE-2022-48893, CVE-2023-52572, CVE-2023-52621, CVE-2023-52752, CVE-2023-52757, CVE-2024-26686, CVE-2024-26739, CVE-2024-35866, CVE-2024-35867, CVE-2024-36908, CVE-2024-38541, CVE-2024-46742, CVE-2024-46784, CVE-2024-50047, CVE-2024-50258, CVE-2024-50272, CVE-2024-50280, CVE-2024-53128, CVE-2024-56599, CVE-2024-56751, CVE-2025-21853, CVE-2025-21927

Detections

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