Use-after-free in Linux kernel - CVE-2026-46259

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Main Vulnerability Database Vulnerabilities #VU133332

Use-after-free in Linux kernel - CVE-2026-46259

Published: June 4, 2026


Vulnerability identifier: #VU133332
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-2026-46259
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 a use-after-free in do_task_stat() in procfs when reading /proc/[pid]/stat. A local user can trigger access to a stale real_parent task reference to cause a denial of service.


Affected software

Linux kernel
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Micro
SUSE Linux Micro Extras
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Real Time
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Anolis OS
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
SUSE Real Time Module
SUSE Linux Enterprise Live Patching
Basesystem Module
Development Tools Module
Legacy Module
Public Cloud Module
openEuler
Ubuntu
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel-livepatch-6_4_0-150700_7_62-rt
kernel-livepatch-SLE15-SP7-RT_Update_17-debugsource
kernel-livepatch-6_4_0-150700_7_62-rt-debuginfo
kernel-livepatch-6_4_0-150700_53_63-default-debuginfo
kernel-livepatch-6_4_0-150700_53_63-default
kernel-livepatch-SLE15-SP7_Update_17-debugsource
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-tools
kernel-debug-modules
kernel-debug-devel
kernel-doc
kernel-debug-core
kernel-abi-stablelists
kernel-debug
kernel-cross-headers
kernel-core
kernel
python3-perf
kernel-tools-libs
kernel-modules-extra
kernel-modules
kernel-headers
kernel-devel
kernel-debug-modules-extra
kernel-tools-libs-devel
perf
bpftool
perf-debuginfo
python3-perf-debuginfo
python2-perf-debuginfo
python2-perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-source
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
kernel-default-devel-debuginfo
kernel-default
kernel-64kb-devel
kernel-64kb-debugsource
kernel-obs-build
kernel-obs-build-debugsource
kernel-default-debugsource
kernel-default-devel
kernel-syms
kernel-64kb
kernel-default-debuginfo
kernel-macros
kernel-kvmsmall
kernel-default-livepatch
kernel-kvmsmall-debuginfo
kernel-kvmsmall-debugsource
kernel-default-base
gfs2-kmp-rt
ocfs2-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-rt-debugsource
kernel-syms-rt
kernel-rt-devel
cluster-md-kmp-rt-debuginfo
kernel-rt-devel-debuginfo
ocfs2-kmp-rt
dlm-kmp-rt-debuginfo
kernel-rt-debuginfo
gfs2-kmp-rt-debuginfo
dlm-kmp-rt
kernel-devel-rt
kernel-source-rt
kernel-rt
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
ocfs2-kmp-default-debuginfo
dlm-kmp-default-debuginfo
kernel-default-livepatch-devel
cluster-md-kmp-default
gfs2-kmp-default-debuginfo
dlm-kmp-default
ocfs2-kmp-default
cluster-md-kmp-default-debuginfo
gfs2-kmp-default
kernel-default-extra
kernel-default-extra-debuginfo
kernel-docs
kernel-azure
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-64kb-debuginfo
kernel-azure-devel-debuginfo
reiserfs-kmp-default-debuginfo
kernel-64kb-devel-debuginfo
kernel-zfcpdump
reiserfs-kmp-default
kernel-azure-devel
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-raspi (Ubuntu package)
linux-ibm-5.15 (Ubuntu package)
linux-intel-iotg (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
linux-azure (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
IBM DataPower Gateway

How to mitigate CVE-2026-46259

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
IBM DataPower Gateway - update to 11.0.0.3
kernel-livepatch-6_4_0-150700_7_62-rt - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7-RT_Update_17-debugsource - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_62-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_53_63-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_63-default - update to 1-150700.15.3.1
kernel-livepatch-SLE15-SP7_Update_17-debugsource - update to 1-150700.15.3.1
kernel (Red Hat package) - addressed in versions 4.18.0-305.216.1.el8_4, 4.18.0-477.177.1.el8_8, 4.18.0-553.140.1.el8_10, 5.14.0-687.22.1.el9_8, 6.12.0-211.31.1.el10_2
kernel-rt (Red Hat package) - update to 4.18.0-553.140.1.rt7.481.el8_10
kernel-tools - update to 4.18.0-553.141.1.0.1
kernel-debug-modules - update to 4.18.0-553.141.1.0.1
kernel-debug-devel - update to 4.18.0-553.141.1.0.1
kernel-doc - update to 4.18.0-553.141.1.0.1
kernel-debug-core - update to 4.18.0-553.141.1.0.1
kernel-abi-stablelists - update to 4.18.0-553.141.1.0.1
kernel-debug - update to 4.18.0-553.141.1.0.1
kernel-cross-headers - update to 4.18.0-553.141.1.0.1
kernel-core - update to 4.18.0-553.141.1.0.1
kernel - update to 4.18.0-553.141.1.0.1
python3-perf - update to 4.18.0-553.141.1.0.1
kernel-tools-libs - update to 4.18.0-553.141.1.0.1
kernel-modules-extra - update to 4.18.0-553.141.1.0.1
kernel-modules - update to 4.18.0-553.141.1.0.1
kernel-headers - update to 4.18.0-553.141.1.0.1
kernel-devel - update to 4.18.0-553.141.1.0.1
kernel-debug-modules-extra - update to 4.18.0-553.141.1.0.1
kernel-tools-libs-devel - update to 4.18.0-553.141.1.0.1
perf - update to 4.18.0-553.141.1.0.1
bpftool - update to 4.18.0-553.141.1.0.1
perf-debuginfo - addressed in versions 4.19.90-2606.3.0.0376, 5.10.0-318.0.0.221, 6.6.0-145.1.15.153
python3-perf-debuginfo - addressed in versions 4.19.90-2606.3.0.0376, 5.10.0-318.0.0.221, 6.6.0-145.1.15.153
python3-perf - addressed in versions 4.19.90-2606.3.0.0376, 5.10.0-318.0.0.221, 6.6.0-145.1.15.153
python2-perf-debuginfo - update to 4.19.90-2606.3.0.0376
python2-perf - update to 4.19.90-2606.3.0.0376
perf - addressed in versions 4.19.90-2606.3.0.0376, 5.10.0-318.0.0.221, 6.6.0-145.1.15.153
kernel-tools-devel - addressed in versions 4.19.90-2606.3.0.0376, 5.10.0-318.0.0.221, 6.6.0-145.1.15.153
kernel-tools-debuginfo - addressed in versions 4.19.90-2606.3.0.0376, 5.10.0-318.0.0.221, 6.6.0-145.1.15.153
kernel-source - addressed in versions 4.19.90-2606.3.0.0376, 5.10.0-318.0.0.221, 6.6.0-145.1.15.153
kernel-devel - addressed in versions 4.19.90-2606.3.0.0376, 5.10.0-318.0.0.221, 6.6.0-145.1.15.153
kernel-debugsource - addressed in versions 4.19.90-2606.3.0.0376, 5.10.0-318.0.0.221, 6.6.0-145.1.15.153
kernel-debuginfo - addressed in versions 4.19.90-2606.3.0.0376, 5.10.0-318.0.0.221, 6.6.0-145.1.15.153
bpftool-debuginfo - addressed in versions 4.19.90-2606.3.0.0376, 5.10.0-318.0.0.221, 6.6.0-145.1.15.153
bpftool - addressed in versions 4.19.90-2606.3.0.0376, 5.10.0-318.0.0.221, 6.6.0-145.1.15.153
kernel - addressed in versions 4.19.90-2606.3.0.0376, 5.10.0-318.0.0.221, 6.6.0-145.1.15.153
kernel-tools - addressed in versions 4.19.90-2606.3.0.0376, 5.10.0-318.0.0.221, 6.6.0-145.1.15.153
kernel-headers - addressed in versions 5.10.0-318.0.0.221, 6.6.0-145.1.15.153
kernel-default-devel-debuginfo - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-default - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-64kb-devel - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-64kb-debugsource - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-obs-build - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-obs-build-debugsource - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-default-debugsource - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-default-devel - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-syms - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-64kb - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-default-debuginfo - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-macros - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-devel - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-source - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-kvmsmall - update to 6.4.0-48.1
kernel-default-livepatch - addressed in versions 6.4.0-48.1, 6.4.0-150700.53.63.1
kernel-kvmsmall-debuginfo - update to 6.4.0-48.1
kernel-kvmsmall-debugsource - update to 6.4.0-48.1
kernel-default-base - addressed in versions 6.4.0-48.1.21.25, 6.4.0-150700.53.63.1.150700.17.37.1
gfs2-kmp-rt - update to 6.4.0-150700.7.62.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
cluster-md-kmp-rt - update to 6.4.0-150700.7.62.1
kernel-rt-debugsource - update to 6.4.0-150700.7.62.1
kernel-syms-rt - update to 6.4.0-150700.7.62.1
kernel-rt-devel - update to 6.4.0-150700.7.62.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.62.1
ocfs2-kmp-rt - update to 6.4.0-150700.7.62.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
kernel-rt-debuginfo - update to 6.4.0-150700.7.62.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.62.1
dlm-kmp-rt - update to 6.4.0-150700.7.62.1
kernel-devel-rt - update to 6.4.0-150700.7.62.1
kernel-source-rt - update to 6.4.0-150700.7.62.1
kernel-rt - update to 6.4.0-150700.7.62.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.63.1
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.63.1
ocfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.63.1
dlm-kmp-default-debuginfo - update to 6.4.0-150700.53.63.1
kernel-default-livepatch-devel - update to 6.4.0-150700.53.63.1
cluster-md-kmp-default - update to 6.4.0-150700.53.63.1
gfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.63.1
dlm-kmp-default - update to 6.4.0-150700.53.63.1
ocfs2-kmp-default - update to 6.4.0-150700.53.63.1
cluster-md-kmp-default-debuginfo - update to 6.4.0-150700.53.63.1
gfs2-kmp-default - update to 6.4.0-150700.53.63.1
kernel-default-extra - update to 6.4.0-150700.53.63.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.63.1
kernel-docs - update to 6.4.0-150700.53.63.1
kernel-azure - update to 6.4.0-150700.53.63.1
kernel-azure-debugsource - update to 6.4.0-150700.53.63.1
kernel-azure-debuginfo - update to 6.4.0-150700.53.63.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.63.1
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.63.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.63.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.63.1
kernel-zfcpdump - update to 6.4.0-150700.53.63.1
reiserfs-kmp-default - update to 6.4.0-150700.53.63.1
kernel-azure-devel - update to 6.4.0-150700.53.63.1
linux (Ubuntu package) - addressed in versions 5.15.0-184.194~20.04.1, 5.15.0-184.194, 5.15.0-186.196~20.04.1, 5.15.0-186.196, 5.15.0-1075.79, 5.15.0-1095.103, 5.15.0-1104.109, 5.15.0-1108.114, 5.15.0-1111.120+fips1, 5.15.0-1112.122, 5.15.0-1112.122+fips1, 5.15.0.184.155, 5.15.0.186.166, 5.15.0.1075.78, 5.15.0.1095.94, 5.15.0.1104.100, 5.15.0.1108.107, 5.15.0.1111.115, 5.15.0.1112.102, 5.15.0.1112.109, 6.8.0-134.134, 6.8.0-1057.58~22.04.1, 6.8.0-1058.61~22.04.1, 6.8.0-1058.61+fips1, 6.8.0-1060.61, 6.8.0-1060.63~22.04.1, 6.8.0-1060.63+fips1, 6.8.0-1063.69, 6.8.0-1063.69+fips1, 6.8.1-1055.56~22.04.1, 6.8.1-1055.56
linux-aws (Ubuntu package) - addressed in versions 5.15.0-186.196+fips1, 5.15.0-1106.110, 5.15.0-1107.108, 5.15.0-1112.119~20.04.1, 5.15.0-1112.119, 5.15.0-1112.119+fips1, 5.15.0.186.109, 5.15.0.1106.103, 5.15.0.1107.107, 5.15.0.1112.108, 5.15.0.1112.115
linux-nvidia-tegra (Ubuntu package) - addressed in versions 5.15.0-1053.53, 5.15.0-1064.66, 5.15.0.1053.55, 5.15.0.1064.64, 6.8.0-1029.30
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1064.66~20.04.1
linux-intel-iot-realtime (Ubuntu package) - addressed in versions 5.15.0-1104.106, 5.15.0-1107.113~20.04.1, 5.15.0.1104.108
linux-raspi (Ubuntu package) - addressed in versions 5.15.0-1106.109, 5.15.0.1106.104, 6.8.0-1060.64
linux-ibm-5.15 (Ubuntu package) - update to 5.15.0-1106.110~20.04.1
linux-intel-iotg (Ubuntu package) - addressed in versions 5.15.0-1107.113, 5.15.0.1107.106
linux-azure-5.15 (Ubuntu package) - addressed in versions 5.15.0-1109.115~20.04.1, 5.15.0-1117.126~20.04.1, 5.15.0-1117.126~20.04.2
linux-azure (Ubuntu package) - addressed in versions 5.15.0-1109.115, 5.15.0-1117.126, 5.15.0.1109.105, 5.15.0.1117.115, 6.8.0-1063.71~22.04.1, 6.8.0-1063.71
linux-gcp-5.15 (Ubuntu package) - update to 5.15.0-1112.122~20.04.1
linux-azure-fde (Ubuntu package) - addressed in versions 5.15.0-1117.126, 6.8.0-1062.69
linux-azure-fips (Ubuntu package) - addressed in versions 5.15.0-1117.126+fips1, 5.15.0.1117.102, 6.8.0-134.134+fips1, 6.8.0-1062.69+fips1
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-136.136~22.04.1
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1045.48, 6.8.0-1057.58~22.04.1, 6.8.0-1058.61.1, 6.8.0-1058.64, 6.8.0-1060.61~22.04.1, 6.8.0-1060.63~22.04.1, 6.8.0-1063.69~22.04.1
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1062.69~22.04.1
linux-raspi-realtime (Ubuntu package) - update to 6.8.0-2049.50

External References

Related Security Bulletins