Amazon Linux 2023 : qemu, qemu-common, qemu-guest-agent (ALAS2023-2026-3241)

high Nessus Plugin ID 371849

Synopsis

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

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-3241 advisory.

hw/usb/hcd-xhci: Set reentrancy guard in timer functions (CVE-2026-17588)

NOTE: Fixed by: https://gitlab.com/qemu-project/qemu/-/commit/1f24066fc88d33455ee54a20f29994d9e69997ba (v11.1.0-rc3)NOTE: Fixed by: https://gitlab.com/qemu- project/qemu/-/commit/5fbd2fe1cc54259d045d00d4966aa2db1ba990d6 (v11.0.4) (CVE-2026-18054)

NOTE: https://gitlab.com/qemu-project/qemu/-/work_items/3917NOTE: Fixed by: https://gitlab.com/qemu- project/qemu/-/commit/0be94d8d9c28e6b7235b34133d057090fe93be6c (v11.1.0-rc2)NOTE: Fixed by:
https://gitlab.com/qemu-project/qemu/-/commit/88a0e5e45b41d407cf9adf1f2cf6f20f394a578d (v11.0.4) (CVE-2026-50624)

NOTE: Fixed by: https://gitlab.com/qemu-project/qemu/-/commit/733a98a552e4bd68932de1f58bd6ea39b57b261c (v11.1.0-rc2)NOTE: Fixed by: https://gitlab.com/qemu- project/qemu/-/commit/6680c5612401c1eaa49eba134d14d374fefeb9d4 (v11.0.4) (CVE-2026-61402)

NOTE: https://gitlab.com/qemu-project/qemu/-/work_items/3875NOTE: Fixed by: https://gitlab.com/qemu- project/qemu/-/commit/f404bf0e6504e0412a00ea64708f17d2a5e3f869 (v11.1.0-rc2)NOTE: Fixed by:
https://gitlab.com/qemu-project/qemu/-/commit/a4abe1f1fa6f465b64fb400bea14c72bd5e32ac9 (v11.0.4) (CVE-2026-61476)

NOTE: Fixed by: https://gitlab.com/qemu-project/qemu/-/commit/b9d248dfaca5e31377ea4f7204aae788a050bafd (v11.1.0-rc2)NOTE: Fixed by: https://gitlab.com/qemu- project/qemu/-/commit/82520d7759557062a5fae2211e3c79bbd5f01ed3 (v11.0.4) (CVE-2026-63110)

Host-side AddressSanitizer heap-buffer-overflow READ in current QEMU master through the virtio-net-pci receive filtering path on q35. The crash is in receive_filter(). (CVE-2026-63320)

NOTE: Fixed by: https://gitlab.com/qemu-project/qemu/-/commit/a6e0519ea8ed6fc84fab9bf9ca82c7a55780f880 (v11.1.0-rc2)NOTE: Fixed by: https://gitlab.com/qemu- project/qemu/-/commit/52c7bb369b23dfcafb6e6d90665c777797b55e88 (v11.1.0-rc2)NOTE: Fixed by:
https://gitlab.com/qemu-project/qemu/-/commit/f348425fddae38e0c1d6823501890acfb2a3bfb1 (v11.0.4)NOTE:
Fixed by: https://gitlab.com/qemu-project/qemu/-/commit/9a06bb17256c0a38f0b53025bf804d2e2035f93f (v11.0.4) (CVE-2026-63321)

NOTE: https://gitlab.com/qemu-project/qemu/-/work_items/3607NOTE: Fixed by: https://gitlab.com/qemu- project/qemu/-/commit/4727cc883b7e81d2c30b9801af54482d65b84292 (v11.1.0-rc2)NOTE: Fixed by:
https://gitlab.com/qemu-project/qemu/-/commit/95b9a1bf26fef7c44f4925f78ade7fa824ed5e76 (v11.0.4) (CVE-2026-63322)

virtio-balloon: fix free-page BH teardown on unrealize (CVE-2026-66899)

hw/net/virtio-net: strip trailing padding when caching RSC segment (CVE-2026-66900)

hw/display/vga: fix text-mode OOB write after a graphics surface switch (CVE-2026-77913)

A flaw was found in QEMU. The VAPIC setup hypercall in hw/i386/vapic.c does not validate that the writable RAM alias remains within the option ROM window. A privileged guest user on a Q35/KVM machine can position this alias over locked SMRAM, bypassing chipset D_LCK protection and injecting code into System Management Mode memory. (CVE-2026-81627)

io/channel-socket: do not treat a zero length write as an error (CVE-2026-84788)

A use-after-free vulnerability was found in QEMU's 9pfs subsystem. A race condition between the main thread and a worker thread when processing concurrent Tlcreate and Twalk requests allows a malicious guest user to craft a fid path containing stale heap data, bypassing directory traversal restrictions and escaping the shared directory boundary. This can lead to arbitrary host file read/write and code execution (VM escape) as the QEMU process user. (CVE-2026-93834)

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 qemu --releasever 2023.12.20261026' or or 'dnf update --advisory ALAS2023-2026-3241 --releasever 2023.12.20261026' to update your system.

Plugin Details

Severity: High

ID: 371849

File Name: al2023_ALAS2023-2026-3241.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 10/25/2026

Updated: 10/25/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 92.98

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-2026-93834

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/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:qemu-common-debuginfo, p-cpe:/a:amazon:linux:qemu-common, p-cpe:/a:amazon:linux:qemu-debuginfo, p-cpe:/a:amazon:linux:qemu-debugsource, p-cpe:/a:amazon:linux:qemu-docs, p-cpe:/a:amazon:linux:qemu-guest-agent-debuginfo, p-cpe:/a:amazon:linux:qemu-guest-agent, p-cpe:/a:amazon:linux:qemu-img-debuginfo, p-cpe:/a:amazon:linux:qemu-img, p-cpe:/a:amazon:linux:qemu-kvm-core, p-cpe:/a:amazon:linux:qemu-kvm, p-cpe:/a:amazon:linux:qemu-pr-helper-debuginfo, p-cpe:/a:amazon:linux:qemu-pr-helper, p-cpe:/a:amazon:linux:qemu-system-aarch64-core-debuginfo, p-cpe:/a:amazon:linux:qemu-system-aarch64-core, p-cpe:/a:amazon:linux:qemu-system-aarch64, p-cpe:/a:amazon:linux:qemu-system-x86-core-debuginfo, p-cpe:/a:amazon:linux:qemu-system-x86-core, p-cpe:/a:amazon:linux:qemu-system-x86, p-cpe:/a:amazon:linux:qemu-tests-debuginfo, p-cpe:/a:amazon:linux:qemu-tests, p-cpe:/a:amazon:linux:qemu-tools-debuginfo, p-cpe:/a:amazon:linux:qemu-tools, p-cpe:/a:amazon:linux:qemu-user-binfmt, p-cpe:/a:amazon:linux:qemu-user-debuginfo, p-cpe:/a:amazon:linux:qemu-user-static-aarch64-debuginfo, p-cpe:/a:amazon:linux:qemu-user-static-aarch64, p-cpe:/a:amazon:linux:qemu-user-static-x86-debuginfo, p-cpe:/a:amazon:linux:qemu-user-static-x86, p-cpe:/a:amazon:linux:qemu-user-static, p-cpe:/a:amazon:linux:qemu-user, p-cpe:/a:amazon:linux:qemu

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: 9/18/2026

Reference Information

CVE: CVE-2026-17588, CVE-2026-18054, CVE-2026-50624, CVE-2026-61402, CVE-2026-61476, CVE-2026-63110, CVE-2026-63320, CVE-2026-63321, CVE-2026-63322, CVE-2026-66899, CVE-2026-66900, CVE-2026-77913, CVE-2026-81627, CVE-2026-84788, CVE-2026-93834

IAVB: 2026-B-0284

Detections

Analytics