Use-after-free in Linux kernel - CVE-2026-74363

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Main Vulnerability Database Vulnerabilities #VU142836

Use-after-free in Linux kernel - CVE-2026-74363

Published: August 15, 2026


Vulnerability identifier: #VU142836
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-2026-74363
CWE-ID: CWE-416
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 use-after-free in bpffs inode handling when a concurrent unlinkat() drops the last inode reference during RCU path walking. A local user can trigger concurrent path operations to cause a denial of service.

The issue occurs because inode fields and the cached symlink body may still be accessed during RCU pathwalk after the inode is freed.


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 Desktop 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Live Patching
SUSE Real Time Module
Legacy Module
Development Tools Module
Basesystem Module
Public Cloud Module
openSUSE Leap
Ubuntu
openEuler
kernel-livepatch-6_4_0-150600_23_138-default-debuginfo
kernel-livepatch-SLE15-SP6_Update_32-debugsource
kernel-livepatch-6_4_0-150600_23_138-default
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
kernel-livepatch-SLE15-SP7_Update_22-debugsource
kernel-livepatch-6_4_0-150700_53_84-default-debuginfo
dtb-altera
dtb-broadcom
dtb-amlogic
dlm-kmp-64kb
dtb-allwinner
ocfs2-kmp-64kb
dtb-apple
kernel-64kb-optional
kselftests-kmp-64kb-debuginfo
kselftests-kmp-64kb
kernel-64kb-devel
dtb-mediatek
dtb-marvell
dtb-freescale
dtb-nvidia
ocfs2-kmp-64kb-debuginfo
cluster-md-kmp-64kb-debuginfo
dtb-sprd
dtb-amd
dtb-rockchip
gfs2-kmp-64kb-debuginfo
reiserfs-kmp-64kb
dtb-hisilicon
kernel-64kb-debuginfo
dtb-renesas
kernel-default-livepatch-devel
kernel-default-debuginfo
cluster-md-kmp-default-debuginfo
kernel-default-debugsource
gfs2-kmp-default-debuginfo
kernel-syms
kernel-default
kernel-macros
kernel-devel
kernel-source
kernel-docs
kernel-default-livepatch
dtb-socionext
cluster-md-kmp-64kb
kernel-64kb-extra
gfs2-kmp-64kb
kernel-64kb-devel-debuginfo
dlm-kmp-64kb-debuginfo
dtb-exynos
dtb-lg
dtb-apm
dtb-xilinx
reiserfs-kmp-64kb-debuginfo
dtb-cavium
ocfs2-kmp-default-debuginfo
kernel-64kb-extra-debuginfo
kernel-kvmsmall-vdso-debuginfo
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
kernel-debug-vdso-debuginfo
cluster-md-kmp-default
reiserfs-kmp-default
dlm-kmp-default-debuginfo
kernel-obs-build-debugsource
reiserfs-kmp-default-debuginfo
kernel-default-devel-debuginfo
kernel-obs-build
ocfs2-kmp-default
kernel-default-devel
gfs2-kmp-default
dlm-kmp-default
kernel-obs-qa
dtb-qcom
kernel-64kb-optional-debuginfo
dtb-arm
dtb-amazon
kernel-64kb-debugsource
kselftests-kmp-default
kernel-default-optional-debuginfo
kernel-default-extra-debuginfo
kernel-default-optional
kselftests-kmp-default-debuginfo
kernel-default-vdso
kernel-default-extra
dtb-aarch64
kernel-64kb
kernel-debug
kernel-debug-devel-debuginfo
kernel-debug-debugsource
kernel-debug-debuginfo
kernel-debug-devel
kernel-kvmsmall-vdso
kernel-debug-vdso
kernel-default-vdso-debuginfo
kernel-default-base-rebuild
kernel-default-base
kernel-rt
cluster-md-kmp-rt-debuginfo
kernel-devel-rt
kernel-source-rt
ocfs2-kmp-rt
gfs2-kmp-rt-debuginfo
gfs2-kmp-rt
dlm-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-rt-debugsource
kernel-syms-rt
dlm-kmp-rt
kernel-rt-devel
kernel-rt-devel-debuginfo
kernel-rt-debuginfo
ocfs2-kmp-rt-debuginfo
kernel-azure-devel
kernel-azure-devel-debuginfo
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-headers
kernel-extra-modules
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel
linux (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-oracle-5.15 (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-gcp (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-azure (Ubuntu package)

How to mitigate CVE-2026-74363

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-livepatch-6_4_0-150600_23_138-default-debuginfo - 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 - 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 - 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-debuginfo - update to 1-150700.15.3.1
dtb-altera - update to 6.4.0-150600.23.138.1
dtb-broadcom - update to 6.4.0-150600.23.138.1
dtb-amlogic - update to 6.4.0-150600.23.138.1
dlm-kmp-64kb - update to 6.4.0-150600.23.138.1
dtb-allwinner - update to 6.4.0-150600.23.138.1
ocfs2-kmp-64kb - update to 6.4.0-150600.23.138.1
dtb-apple - update to 6.4.0-150600.23.138.1
kernel-64kb-optional - update to 6.4.0-150600.23.138.1
kselftests-kmp-64kb-debuginfo - update to 6.4.0-150600.23.138.1
kselftests-kmp-64kb - 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
dtb-mediatek - update to 6.4.0-150600.23.138.1
dtb-marvell - update to 6.4.0-150600.23.138.1
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
reiserfs-kmp-64kb - 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-default-livepatch-devel - 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
kernel-devel - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
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
dtb-socionext - update to 6.4.0-150600.23.138.1
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
gfs2-kmp-64kb - 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
dlm-kmp-64kb-debuginfo - update to 6.4.0-150600.23.138.1
dtb-exynos - update to 6.4.0-150600.23.138.1
dtb-lg - update to 6.4.0-150600.23.138.1
dtb-apm - 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
ocfs2-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
kernel-64kb-extra-debuginfo - update to 6.4.0-150600.23.138.1
kernel-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.138.1
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
kernel-debug-vdso-debuginfo - update to 6.4.0-150600.23.138.1
cluster-md-kmp-default - addressed in versions 6.4.0-150600.23.138.1, 6.4.0-150700.53.84.1
reiserfs-kmp-default - 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
kernel-obs-build-debugsource - 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-obs-qa - 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-arm - update to 6.4.0-150600.23.138.1
dtb-amazon - 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
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-default-vdso - 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-debug-devel-debuginfo - update to 6.4.0-150600.23.138.1
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-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 - update to 6.4.0-150700.7.78.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.78.1
kernel-devel-rt - update to 6.4.0-150700.7.78.1
kernel-source-rt - update to 6.4.0-150700.7.78.1
ocfs2-kmp-rt - update to 6.4.0-150700.7.78.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.78.1
gfs2-kmp-rt - update to 6.4.0-150700.7.78.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.78.1
cluster-md-kmp-rt - update to 6.4.0-150700.7.78.1
kernel-rt-debugsource - update to 6.4.0-150700.7.78.1
kernel-syms-rt - update to 6.4.0-150700.7.78.1
dlm-kmp-rt - update to 6.4.0-150700.7.78.1
kernel-rt-devel - update to 6.4.0-150700.7.78.1
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.78.1
kernel-rt-debuginfo - update to 6.4.0-150700.7.78.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.78.1
kernel-azure-devel - update to 6.4.0-150700.53.84.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.84.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.84.1
kernel-azure-debugsource - update to 6.4.0-150700.53.84.1
kernel-azure - update to 6.4.0-150700.53.84.1
python3-perf-debuginfo - update to 6.6.0-145.3.29.160
python3-perf - update to 6.6.0-145.3.29.160
perf-debuginfo - update to 6.6.0-145.3.29.160
perf - update to 6.6.0-145.3.29.160
kernel-tools-devel - update to 6.6.0-145.3.29.160
kernel-tools-debuginfo - update to 6.6.0-145.3.29.160
kernel-tools - update to 6.6.0-145.3.29.160
kernel-source - update to 6.6.0-145.3.29.160
kernel-headers - update to 6.6.0-145.3.29.160
kernel-extra-modules - update to 6.6.0-145.3.29.160
kernel-devel - update to 6.6.0-145.3.29.160
kernel-debugsource - update to 6.6.0-145.3.29.160
kernel-debuginfo - update to 6.6.0-145.3.29.160
bpftool-debuginfo - update to 6.6.0-145.3.29.160
bpftool - update to 6.6.0-145.3.29.160
kernel - update to 6.6.0-145.3.29.160
linux (Ubuntu package) - addressed in versions 5.15.0-195.205~20.04.1, 5.15.0-195.205, 5.15.0-198.208~20.04.1, 5.15.0-198.208+fips1, 5.15.0-1080.84, 5.15.0-1100.108, 5.15.0-1109.111, 5.15.0-1109.114, 5.15.0-1111.115~20.04.1, 5.15.0-1111.115, 5.15.0-1112.118~20.04.1, 5.15.0-1112.118, 5.15.0-1113.119, 5.15.0-1114.120, 5.15.0-1116.125~20.04.1, 5.15.0-1117.124~20.04.1, 5.15.0-1117.124, 5.15.0-1117.124+fips1, 5.15.0-1122.131~20.04.1, 5.15.0-1123.132~20.04.1, 5.15.0-1123.132, 5.15.0-1123.132+fips1, 5.15.0.195.160, 5.15.0.195.205~20.04.1, 5.15.0.198.114, 5.15.0.198.171, 5.15.0.198.208~20.04.1, 5.15.0.1080.83~20.04.1, 5.15.0.1100.99, 5.15.0.1109.105, 5.15.0.1109.113, 5.15.0.1111.108, 5.15.0.1111.115~20.04.1, 5.15.0.1112.111, 5.15.0.1112.118~20.04.1, 5.15.0.1113.112, 5.15.0.1114.110, 5.15.0.1116.120, 5.15.0.1117.113, 5.15.0.1117.120, 5.15.0.1117.124~20.04.1, 5.15.0.1122.131~20.04.1, 5.15.0.1123.107, 5.15.0.1123.121, 5.15.0.1123.132~20.04.1, 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-nvidia (Ubuntu package) - addressed in versions 5.15.0-1112.113, 5.15.0.1112.112
linux-oracle-5.15 (Ubuntu package) - addressed in versions 5.15.0-1114.120~20.04.1, 5.15.0.1114.120~20.04.1
linux-gcp-5.15 (Ubuntu package) - addressed in versions 5.15.0-1118.128~20.04.1, 5.15.0.1118.128~20.04.1
linux-gcp (Ubuntu package) - addressed in versions 5.15.0-1118.128, 5.15.0-1118.128+fips1, 5.15.0.1118.107, 5.15.0.1118.115
linux-azure-fde (Ubuntu package) - addressed in versions 5.15.0-1122.131, 5.15.0.1122.131
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
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1017.17

External References

Related Security Bulletins