Improper control of a resource through its lifetime in Linux kernel - CVE-2026-74356

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU142829

Improper control of a resource through its lifetime in Linux kernel - CVE-2026-74356

Published: August 15, 2026


Vulnerability identifier: #VU142829
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74356
CWE-ID: CWE-664
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper state management in vhost_get_avail_idx in the vhost subsystem when handling available ring entries with mergeable buffers enabled. A local user can trigger repeated processing of available entries to cause a denial of service.

The issue can lead to a host livelock when the guest is not making progress and notifications are re-enabled while entries remain in the ring.


Affected software

Linux kernel
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Live Patching
Public Cloud Module
Legacy Module
Development Tools Module
Basesystem Module
SUSE Real Time Module
openSUSE Leap
openEuler
Ubuntu
linux (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-azure (Ubuntu package)
linux-gcp (Ubuntu package)
linux-aws (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-realtime (Ubuntu package)
linux-fips (Ubuntu package)
linux-gkeop (Ubuntu package)
linux-gke (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)
kernel-livepatch-6_4_0-150600_23_138-default
kernel-livepatch-SLE15-SP6_Update_32-debugsource
kernel-livepatch-6_4_0-150600_23_138-default-debuginfo
kernel-livepatch-6_4_0-150700_7_78-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_78-rt
kernel-livepatch-SLE15-SP7-RT_Update_21-debugsource
kernel-livepatch-6_4_0-150700_53_84-default-debuginfo
kernel-livepatch-SLE15-SP7_Update_22-debugsource
kernel-livepatch-6_4_0-150700_53_84-default
dtb-exynos
gfs2-kmp-64kb
dtb-lg
dtb-marvell
dtb-xilinx
reiserfs-kmp-64kb-debuginfo
dtb-cavium
dtb-socionext
ocfs2-kmp-64kb
dtb-mediatek
kernel-64kb-devel
kselftests-kmp-64kb
kselftests-kmp-64kb-debuginfo
kernel-64kb-optional
dtb-apple
dtb-altera
dtb-allwinner
dlm-kmp-64kb
kernel-devel
ocfs2-kmp-default-debuginfo
kernel-default-debuginfo
cluster-md-kmp-default-debuginfo
kernel-default-debugsource
gfs2-kmp-default-debuginfo
kernel-syms
kernel-default
kernel-macros
dlm-kmp-64kb-debuginfo
kernel-source
kernel-docs
kernel-default-livepatch
kernel-default-livepatch-devel
cluster-md-kmp-64kb
kernel-64kb-extra
dtb-broadcom
kernel-64kb-devel-debuginfo
kernel-debug-devel-debuginfo
kselftests-kmp-default
kernel-default-optional-debuginfo
kernel-default-extra-debuginfo
kernel-default-optional
kselftests-kmp-default-debuginfo
kernel-obs-qa
kernel-default-extra
dtb-aarch64
kernel-64kb
kernel-debug
kernel-64kb-debugsource
kernel-debug-debugsource
kernel-debug-debuginfo
kernel-debug-devel
kernel-kvmsmall-vdso
kernel-debug-vdso
kernel-default-vdso-debuginfo
kernel-default-vdso
kernel-debug-vdso-debuginfo
kernel-kvmsmall-vdso-debuginfo
reiserfs-kmp-64kb
kernel-obs-build-debugsource
dtb-freescale
dtb-nvidia
ocfs2-kmp-64kb-debuginfo
cluster-md-kmp-64kb-debuginfo
dtb-sprd
dtb-amd
dtb-rockchip
gfs2-kmp-64kb-debuginfo
dtb-amlogic
dtb-hisilicon
kernel-64kb-debuginfo
dtb-renesas
kernel-64kb-extra-debuginfo
dtb-qcom
kernel-64kb-optional-debuginfo
dtb-apm
dtb-arm
dtb-amazon
reiserfs-kmp-default
kernel-kvmsmall-debuginfo
kernel-kvmsmall-devel
kernel-kvmsmall-debugsource
kernel-kvmsmall-devel-debuginfo
kernel-docs-html
kernel-source-vanilla
kernel-kvmsmall
kernel-zfcpdump
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
dlm-kmp-default-debuginfo
cluster-md-kmp-default
reiserfs-kmp-default-debuginfo
kernel-default-devel-debuginfo
kernel-obs-build
ocfs2-kmp-default
kernel-default-devel
gfs2-kmp-default
dlm-kmp-default
kernel-default-base-rebuild
kernel-default-base
kernel-rt-debuginfo
kernel-rt
ocfs2-kmp-rt-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-rt-devel-debuginfo
kernel-rt-devel
dlm-kmp-rt
kernel-syms-rt
kernel-rt-debugsource
cluster-md-kmp-rt
dlm-kmp-rt-debuginfo
gfs2-kmp-rt
gfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
kernel-source-rt
kernel-devel-rt
kernel-azure
kernel-azure-debugsource
kernel-azure-devel
kernel-azure-debuginfo
kernel-azure-devel-debuginfo
bpftool
kernel-debuginfo
kernel-extra-modules
kernel-headers
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo
kernel-debugsource
bpftool-debuginfo
kernel
linux-nvidia-tegra (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)

How to mitigate CVE-2026-74356

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 6.8.0-147.147, 7.0.0-38.38, 7.0.0-38.38.1, 7.0.0-1008.9, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14, 7.0.0-1015.15
linux-lowlatency (Ubuntu package) - update to 6.8.0-147.147.1
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1071.79, 7.0.0-1016.16, 7.0.0-1017.17
linux-gcp (Ubuntu package) - update to 6.8.0-1071.79
linux-aws (Ubuntu package) - update to 6.8.0-1067.70
linux-ibm (Ubuntu package) - update to 6.8.0-1067.68
linux-oracle (Ubuntu package) - update to 6.8.0-1064.67
linux-azure-fde (Ubuntu package) - update to 6.8.0-1069.76
linux-realtime (Ubuntu package) - update to 6.8.1-1062.63
linux-fips (Ubuntu package) - update to 6.8.0-147.147+fips1
linux-gkeop (Ubuntu package) - update to 6.8.0-1052.56
linux-gke (Ubuntu package) - update to 6.8.0-1066.74
linux-azure-fips (Ubuntu package) - update to 6.8.0-1071.79+fips1
linux-aws-fips (Ubuntu package) - update to 6.8.0-1067.70+fips1
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1071.79+fips1
kernel-livepatch-6_4_0-150600_23_138-default - update to 1-150600.13.3.1
kernel-livepatch-SLE15-SP6_Update_32-debugsource - update to 1-150600.13.3.1
kernel-livepatch-6_4_0-150600_23_138-default-debuginfo - update to 1-150600.13.3.1
kernel-livepatch-6_4_0-150700_7_78-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_78-rt - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7-RT_Update_21-debugsource - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_53_84-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-SLE15-SP7_Update_22-debugsource - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_84-default - update to 1-150700.15.3.1
dtb-exynos - update to 6.4.0-150600.23.138.1
gfs2-kmp-64kb - update to 6.4.0-150600.23.138.1
dtb-lg - update to 6.4.0-150600.23.138.1
dtb-marvell - update to 6.4.0-150600.23.138.1
dtb-xilinx - update to 6.4.0-150600.23.138.1
reiserfs-kmp-64kb-debuginfo - update to 6.4.0-150600.23.138.1
dtb-cavium - update to 6.4.0-150600.23.138.1
dtb-socionext - update to 6.4.0-150600.23.138.1
ocfs2-kmp-64kb - update to 6.4.0-150600.23.138.1
dtb-mediatek - update to 6.4.0-150600.23.138.1
kernel-64kb-devel - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kselftests-kmp-64kb - update to 6.4.0-150600.23.138.1
kselftests-kmp-64kb-debuginfo - update to 6.4.0-150600.23.138.1
kernel-64kb-optional - update to 6.4.0-150600.23.138.1
dtb-apple - update to 6.4.0-150600.23.138.1
dtb-altera - update to 6.4.0-150600.23.138.1
dtb-allwinner - update to 6.4.0-150600.23.138.1
dlm-kmp-64kb - update to 6.4.0-150600.23.138.1
kernel-devel - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
ocfs2-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-default-debuginfo - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
cluster-md-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-default-debugsource - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
gfs2-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-syms - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-default - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-macros - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
dlm-kmp-64kb-debuginfo - update to 6.4.0-150600.23.138.1
kernel-source - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-docs - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-default-livepatch - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-default-livepatch-devel - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
cluster-md-kmp-64kb - update to 6.4.0-150600.23.138.1
kernel-64kb-extra - update to 6.4.0-150600.23.138.1
dtb-broadcom - update to 6.4.0-150600.23.138.1
kernel-64kb-devel-debuginfo - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-debug-devel-debuginfo - update to 6.4.0-150600.23.138.1
kselftests-kmp-default - update to 6.4.0-150600.23.138.1
kernel-default-optional-debuginfo - update to 6.4.0-150600.23.138.1
kernel-default-extra-debuginfo - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-default-optional - update to 6.4.0-150600.23.138.1
kselftests-kmp-default-debuginfo - update to 6.4.0-150600.23.138.1
kernel-obs-qa - update to 6.4.0-150600.23.138.1
kernel-default-extra - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
dtb-aarch64 - update to 6.4.0-150600.23.138.1
kernel-64kb - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-debug - update to 6.4.0-150600.23.138.1
kernel-64kb-debugsource - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-debug-debugsource - update to 6.4.0-150600.23.138.1
kernel-debug-debuginfo - update to 6.4.0-150600.23.138.1
kernel-debug-devel - update to 6.4.0-150600.23.138.1
kernel-kvmsmall-vdso - update to 6.4.0-150600.23.138.1
kernel-debug-vdso - update to 6.4.0-150600.23.138.1
kernel-default-vdso-debuginfo - update to 6.4.0-150600.23.138.1
kernel-default-vdso - update to 6.4.0-150600.23.138.1
kernel-debug-vdso-debuginfo - update to 6.4.0-150600.23.138.1
kernel-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.138.1
reiserfs-kmp-64kb - update to 6.4.0-150600.23.138.1
kernel-obs-build-debugsource - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
dtb-freescale - update to 6.4.0-150600.23.138.1
dtb-nvidia - update to 6.4.0-150600.23.138.1
ocfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.138.1
cluster-md-kmp-64kb-debuginfo - update to 6.4.0-150600.23.138.1
dtb-sprd - update to 6.4.0-150600.23.138.1
dtb-amd - update to 6.4.0-150600.23.138.1
dtb-rockchip - update to 6.4.0-150600.23.138.1
gfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.138.1
dtb-amlogic - update to 6.4.0-150600.23.138.1
dtb-hisilicon - update to 6.4.0-150600.23.138.1
kernel-64kb-debuginfo - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
dtb-renesas - update to 6.4.0-150600.23.138.1
kernel-64kb-extra-debuginfo - update to 6.4.0-150600.23.138.1
dtb-qcom - update to 6.4.0-150600.23.138.1
kernel-64kb-optional-debuginfo - update to 6.4.0-150600.23.138.1
dtb-apm - update to 6.4.0-150600.23.138.1
dtb-arm - update to 6.4.0-150600.23.138.1
dtb-amazon - update to 6.4.0-150600.23.138.1
reiserfs-kmp-default - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-kvmsmall-debuginfo - update to 6.4.0-150600.23.138.1
kernel-kvmsmall-devel - update to 6.4.0-150600.23.138.1
kernel-kvmsmall-debugsource - update to 6.4.0-150600.23.138.1
kernel-kvmsmall-devel-debuginfo - update to 6.4.0-150600.23.138.1
kernel-docs-html - update to 6.4.0-150600.23.138.1
kernel-source-vanilla - update to 6.4.0-150600.23.138.1
kernel-kvmsmall - update to 6.4.0-150600.23.138.1
kernel-zfcpdump - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-zfcpdump-debugsource - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-zfcpdump-debuginfo - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
dlm-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
cluster-md-kmp-default - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
reiserfs-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-default-devel-debuginfo - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-obs-build - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
ocfs2-kmp-default - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-default-devel - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
gfs2-kmp-default - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
dlm-kmp-default - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-default-base-rebuild - update to 6.4.0-150600.23.138.1.150600.12.64.1
kernel-default-base - addressed in versions 6.4.0-150600.23.138.1.150600.12.64.1, 6.4.0-150700.53.84.1.150700.17.47.1
kernel-rt-debuginfo - update to 6.4.0-150700.7.78.1
kernel-rt - update to 6.4.0-150700.7.78.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.78.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.78.1
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.78.1
kernel-rt-devel - update to 6.4.0-150700.7.78.1
dlm-kmp-rt - update to 6.4.0-150700.7.78.1
kernel-syms-rt - update to 6.4.0-150700.7.78.1
kernel-rt-debugsource - update to 6.4.0-150700.7.78.1
cluster-md-kmp-rt - update to 6.4.0-150700.7.78.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.78.1
gfs2-kmp-rt - update to 6.4.0-150700.7.78.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.78.1
ocfs2-kmp-rt - update to 6.4.0-150700.7.78.1
kernel-source-rt - update to 6.4.0-150700.7.78.1
kernel-devel-rt - update to 6.4.0-150700.7.78.1
kernel-azure - update to 6.4.0-150700.53.84.1
kernel-azure-debugsource - update to 6.4.0-150700.53.84.1
kernel-azure-devel - update to 6.4.0-150700.53.84.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.84.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.84.1
bpftool - update to 6.6.0-145.3.31.162
kernel-debuginfo - update to 6.6.0-145.3.31.162
kernel-devel - update to 6.6.0-145.3.31.162
kernel-extra-modules - update to 6.6.0-145.3.31.162
kernel-headers - update to 6.6.0-145.3.31.162
kernel-source - update to 6.6.0-145.3.31.162
kernel-tools - update to 6.6.0-145.3.31.162
kernel-tools-debuginfo - update to 6.6.0-145.3.31.162
kernel-tools-devel - update to 6.6.0-145.3.31.162
perf - update to 6.6.0-145.3.31.162
perf-debuginfo - update to 6.6.0-145.3.31.162
python3-perf - update to 6.6.0-145.3.31.162
python3-perf-debuginfo - update to 6.6.0-145.3.31.162
kernel-debugsource - update to 6.6.0-145.3.31.162
bpftool-debuginfo - update to 6.6.0-145.3.31.162
kernel - update to 6.6.0-145.3.31.162
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1036.39+1
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1015.15
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1

External References

Related Security Bulletins