Incorrect Conversion between Numeric Types in Linux kernel - CVE-2026-52933

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Main Vulnerability Database Vulnerabilities #VU135444

Incorrect Conversion between Numeric Types in Linux kernel - CVE-2026-52933

Published: June 25, 2026


Vulnerability identifier: #VU135444
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-2026-52933
CWE-ID: CWE-681
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 type conversion in io_poll_get_ownership() in io_uring/poll.c when handling poll ownership checks. A local user can trigger the affected code path to cause a denial of service.


Affected software

Linux kernel
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Workstation Extension 15
Red Hat Enterprise Linux Server - AUS
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
SUSE Linux Enterprise Live Patching
Public Cloud Module
Legacy Module
Development Tools Module
Basesystem Module
SUSE Real Time Module
openSUSE Leap
Ubuntu
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
linux (Ubuntu package)
linux-kvm (Ubuntu package)
linux-gcp (Ubuntu package)
linux-aws (Ubuntu package)
linux-azure (Ubuntu package)
linux-raspi (Ubuntu package)
linux-oracle (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-gke (Ubuntu package)
linux-aws-5.15 (Ubuntu package)
linux-lowlatency-hwe-5.15 (Ubuntu package)
linux-hwe-5.15 (Ubuntu package)
linux-fips (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
linux-nvidia-tegra-igx (Ubuntu package)
linux-realtime (Ubuntu package)
linux-intel-iotg (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-gkeop (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-azure-fde-5.15 (Ubuntu package)
linux-ibm-5.15 (Ubuntu package)
linux-ibm (Ubuntu package)
linux-intel-iotg-5.15 (Ubuntu package)
linux-oracle-5.15 (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-xilinx-zynqmp (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-azure-fips (Ubuntu package)
kernel-livepatch-6_4_0-150600_23_125-default-debuginfo
kernel-livepatch-6_4_0-150600_23_125-default
kernel-livepatch-SLE15-SP6_Update_29-debugsource
kernel-livepatch-6_4_0-150700_7_67-rt-debuginfo
kernel-livepatch-SLE15-SP7-RT_Update_18-debugsource
kernel-livepatch-6_4_0-150700_7_67-rt
kernel-livepatch-SLE15-SP7_Update_19-debugsource
kernel-livepatch-6_4_0-150700_53_73-default-debuginfo
kernel-livepatch-6_4_0-150700_53_73-default
kernel (Red Hat package)
kernel-syms
gfs2-kmp-default
kernel-default-optional
dlm-kmp-default-debuginfo
cluster-md-kmp-default
ocfs2-kmp-default
reiserfs-kmp-default-debuginfo
kernel-default-devel-debuginfo
gfs2-kmp-default-debuginfo
kernel-obs-qa
kernel-default-extra
dtb-rockchip
kernel-default-devel
cluster-md-kmp-default-debuginfo
dlm-kmp-64kb-debuginfo
gfs2-kmp-64kb
dtb-socionext
kernel-default-livepatch
kernel-default-extra-debuginfo
kernel-default-optional-debuginfo
kselftests-kmp-default
kselftests-kmp-default-debuginfo
kernel-default-debuginfo
dlm-kmp-default
reiserfs-kmp-default
kernel-obs-build-debugsource
kernel-default-debugsource
kernel-obs-build
ocfs2-kmp-default-debuginfo
kernel-debug-devel-debuginfo
kernel-default-vdso-debuginfo
kernel-debug-vdso
kernel-default-vdso
kernel-kvmsmall-vdso-debuginfo
kernel-kvmsmall-vdso
kernel-debug-vdso-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-debug
kernel-64kb
kernel-docs
dtb-aarch64
kernel-debug-debuginfo
kernel-debug-devel
kernel-kvmsmall-devel-debuginfo
kernel-debug-debugsource
kernel-default
kernel-kvmsmall
kernel-default-livepatch-devel
kernel-zfcpdump
kernel-source
kernel-docs-html
kernel-devel
kernel-macros
kernel-source-vanilla
kernel-kvmsmall-debugsource
kernel-kvmsmall-debuginfo
kernel-kvmsmall-devel
dtb-amd
ocfs2-kmp-64kb-debuginfo
reiserfs-kmp-64kb-debuginfo
ocfs2-kmp-64kb
kernel-64kb-extra
dtb-xilinx
dtb-nvidia
kernel-64kb-extra-debuginfo
dtb-sprd
kernel-64kb-debuginfo
dtb-mediatek
dtb-amlogic
cluster-md-kmp-64kb-debuginfo
dtb-amazon
dlm-kmp-64kb
kselftests-kmp-64kb-debuginfo
kernel-64kb-optional-debuginfo
dtb-lg
dtb-apm
dtb-freescale
gfs2-kmp-64kb-debuginfo
reiserfs-kmp-64kb
dtb-cavium
kernel-64kb-devel
dtb-marvell
dtb-apple
dtb-exynos
dtb-allwinner
kernel-64kb-debugsource
dtb-hisilicon
cluster-md-kmp-64kb
kernel-64kb-devel-debuginfo
dtb-renesas
dtb-arm
dtb-qcom
dtb-broadcom
dtb-altera
kselftests-kmp-64kb
kernel-64kb-optional
kernel-default-base-rebuild
kernel-default-base
kernel-rt-devel-debuginfo
ocfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
gfs2-kmp-rt
dlm-kmp-rt-debuginfo
kernel-rt-devel
gfs2-kmp-rt-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-syms-rt
cluster-md-kmp-rt
dlm-kmp-rt
kernel-rt-debuginfo
kernel-devel-rt
kernel-source-rt
kernel-rt
kernel-rt-debugsource
kernel-azure-debugsource
kernel-azure
kernel-azure-debuginfo
kernel-azure-devel-debuginfo
kernel-azure-devel
linux-hwe-6.8 (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)

How to mitigate CVE-2026-52933

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 5.15.0-198.208, 6.8.0-136.136, 6.8.0-1046.50, 6.8.0-1059.67, 6.8.0-1064.72~22.04.1, 6.8.0-1064.72, 6.8.1-1056.57~22.04.2, 6.8.1-1056.57, 7.0.0-27.27
linux-kvm (Ubuntu package) - update to 5.15.0-1109.114
linux-gcp (Ubuntu package) - addressed in versions 5.15.0-1118.128, 7.0.0-1007.7
linux-aws (Ubuntu package) - addressed in versions 5.15.0-1117.124, 6.8.0-1061.64+1, 7.0.0-1008.8
linux-azure (Ubuntu package) - addressed in versions 5.15.0-1123.132, 6.8.0-1063.71~22.04.1, 6.8.0-1063.71, 7.0.0-1010.10
linux-raspi (Ubuntu package) - addressed in versions 5.15.0-1113.116, 6.8.0-1061.65, 6.8.0-2050.52, 7.0.0-1014.14
linux-oracle (Ubuntu package) - addressed in versions 5.15.0-1114.120, 7.0.0-1007.7
linux-lowlatency (Ubuntu package) - update to 5.15.0-195.205
linux-gke (Ubuntu package) - update to 5.15.0-1113.119
linux-aws-5.15 (Ubuntu package) - update to 5.15.0-1117.124~20.04.1
linux-lowlatency-hwe-5.15 (Ubuntu package) - update to 5.15.0-195.205~20.04.1
linux-hwe-5.15 (Ubuntu package) - update to 5.15.0-198.208~20.04.1
linux-fips (Ubuntu package) - addressed in versions 5.15.0-198.208+fips1, 6.8.0-136.136+fips2, 6.8.0-136.136.2~22.04.1, 6.8.0-136.136.2, 6.8.0-1058.61
linux-azure-5.15 (Ubuntu package) - update to 5.15.0-1123.132~20.04.1
linux-nvidia-tegra-igx (Ubuntu package) - update to 5.15.0-1059.59
linux-realtime (Ubuntu package) - addressed in versions 5.15.0-1116.125, 7.0.0-27.27.1
linux-intel-iotg (Ubuntu package) - update to 5.15.0-1112.118
linux-nvidia-tegra (Ubuntu package) - update to 5.15.0-1070.72
linux-gkeop (Ubuntu package) - update to 5.15.0-1100.108
linux-nvidia (Ubuntu package) - addressed in versions 5.15.0-1112.113, 6.8.0-1059.62~22.04.1, 6.8.0-1059.62, 6.8.0-1059.62.1, 7.0.0-1013.13
linux-azure-fde-5.15 (Ubuntu package) - update to 5.15.0-1122.131~20.04.1
linux-ibm-5.15 (Ubuntu package) - update to 5.15.0-1111.115~20.04.1
linux-ibm (Ubuntu package) - addressed in versions 5.15.0-1111.115, 6.8.0-1030.31, 6.8.0-1033.34, 6.8.0-1061.62~22.04.1, 6.8.0-1061.62, 7.0.0-1009.9
linux-intel-iotg-5.15 (Ubuntu package) - update to 5.15.0-1112.118~20.04.1
linux-oracle-5.15 (Ubuntu package) - update to 5.15.0-1114.120~20.04.1
linux-gcp-5.15 (Ubuntu package) - update to 5.15.0-1118.128~20.04.1
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1070.72~20.04.1
linux-azure-fde (Ubuntu package) - addressed in versions 5.15.0-1122.131, 6.8.0-1062.69, 7.0.0-1009.9
linux-xilinx-zynqmp (Ubuntu package) - update to 5.15.0-1080.84
linux-intel-iot-realtime (Ubuntu package) - update to 5.15.0-1109.111
linux-gcp-fips (Ubuntu package) - addressed in versions 5.15.0-1118.128+fips1, 6.8.0-1064.72+fips1
linux-aws-fips (Ubuntu package) - update to 5.15.0-1117.124+fips1
linux-azure-fips (Ubuntu package) - addressed in versions 5.15.0-1123.132+fips1, 6.8.0-1063.71+fips2
kernel-livepatch-6_4_0-150600_23_125-default-debuginfo - update to 1-150600.13.7.1
kernel-livepatch-6_4_0-150600_23_125-default - update to 1-150600.13.7.1
kernel-livepatch-SLE15-SP6_Update_29-debugsource - update to 1-150600.13.7.1
kernel-livepatch-6_4_0-150700_7_67-rt-debuginfo - update to 1-150700.1.5.1
kernel-livepatch-SLE15-SP7-RT_Update_18-debugsource - update to 1-150700.1.5.1
kernel-livepatch-6_4_0-150700_7_67-rt - update to 1-150700.1.5.1
kernel-livepatch-SLE15-SP7_Update_19-debugsource - update to 1-150700.15.3.4
kernel-livepatch-6_4_0-150700_53_73-default-debuginfo - update to 1-150700.15.3.4
kernel-livepatch-6_4_0-150700_53_73-default - update to 1-150700.15.3.4
kernel (Red Hat package) - addressed in versions 5.14.0-427.150.1.el9_4, 6.12.0-55.104.1.el10_0
kernel-syms - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.1
gfs2-kmp-default - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
kernel-default-optional - update to 6.4.0-150600.23.125.1
dlm-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
cluster-md-kmp-default - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
ocfs2-kmp-default - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
reiserfs-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
kernel-default-devel-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
gfs2-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
kernel-obs-qa - update to 6.4.0-150600.23.125.1
kernel-default-extra - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
dtb-rockchip - update to 6.4.0-150600.23.125.1
kernel-default-devel - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
cluster-md-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
dlm-kmp-64kb-debuginfo - update to 6.4.0-150600.23.125.1
gfs2-kmp-64kb - update to 6.4.0-150600.23.125.1
dtb-socionext - update to 6.4.0-150600.23.125.1
kernel-default-livepatch - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
kernel-default-extra-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
kernel-default-optional-debuginfo - update to 6.4.0-150600.23.125.1
kselftests-kmp-default - update to 6.4.0-150600.23.125.1
kselftests-kmp-default-debuginfo - update to 6.4.0-150600.23.125.1
kernel-default-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
dlm-kmp-default - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
reiserfs-kmp-default - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
kernel-obs-build-debugsource - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
kernel-default-debugsource - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
kernel-obs-build - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
ocfs2-kmp-default-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
kernel-debug-devel-debuginfo - update to 6.4.0-150600.23.125.1
kernel-default-vdso-debuginfo - update to 6.4.0-150600.23.125.1
kernel-debug-vdso - update to 6.4.0-150600.23.125.1
kernel-default-vdso - update to 6.4.0-150600.23.125.1
kernel-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.125.1
kernel-kvmsmall-vdso - update to 6.4.0-150600.23.125.1
kernel-debug-vdso-debuginfo - update to 6.4.0-150600.23.125.1
kernel-zfcpdump-debugsource - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
kernel-zfcpdump-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
kernel-debug - update to 6.4.0-150600.23.125.1
kernel-64kb - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
kernel-docs - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.1
dtb-aarch64 - update to 6.4.0-150600.23.125.1
kernel-debug-debuginfo - update to 6.4.0-150600.23.125.1
kernel-debug-devel - update to 6.4.0-150600.23.125.1
kernel-kvmsmall-devel-debuginfo - update to 6.4.0-150600.23.125.1
kernel-debug-debugsource - update to 6.4.0-150600.23.125.1
kernel-default - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
kernel-kvmsmall - update to 6.4.0-150600.23.125.1
kernel-default-livepatch-devel - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
kernel-zfcpdump - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
kernel-source - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.1
kernel-docs-html - update to 6.4.0-150600.23.125.1
kernel-devel - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.1
kernel-macros - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.1
kernel-source-vanilla - update to 6.4.0-150600.23.125.1
kernel-kvmsmall-debugsource - update to 6.4.0-150600.23.125.1
kernel-kvmsmall-debuginfo - update to 6.4.0-150600.23.125.1
kernel-kvmsmall-devel - update to 6.4.0-150600.23.125.1
dtb-amd - update to 6.4.0-150600.23.125.1
ocfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.125.1
reiserfs-kmp-64kb-debuginfo - update to 6.4.0-150600.23.125.1
ocfs2-kmp-64kb - update to 6.4.0-150600.23.125.1
kernel-64kb-extra - update to 6.4.0-150600.23.125.1
dtb-xilinx - update to 6.4.0-150600.23.125.1
dtb-nvidia - update to 6.4.0-150600.23.125.1
kernel-64kb-extra-debuginfo - update to 6.4.0-150600.23.125.1
dtb-sprd - update to 6.4.0-150600.23.125.1
kernel-64kb-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
dtb-mediatek - update to 6.4.0-150600.23.125.1
dtb-amlogic - update to 6.4.0-150600.23.125.1
cluster-md-kmp-64kb-debuginfo - update to 6.4.0-150600.23.125.1
dtb-amazon - update to 6.4.0-150600.23.125.1
dlm-kmp-64kb - update to 6.4.0-150600.23.125.1
kselftests-kmp-64kb-debuginfo - update to 6.4.0-150600.23.125.1
kernel-64kb-optional-debuginfo - update to 6.4.0-150600.23.125.1
dtb-lg - update to 6.4.0-150600.23.125.1
dtb-apm - update to 6.4.0-150600.23.125.1
dtb-freescale - update to 6.4.0-150600.23.125.1
gfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.125.1
reiserfs-kmp-64kb - update to 6.4.0-150600.23.125.1
dtb-cavium - update to 6.4.0-150600.23.125.1
kernel-64kb-devel - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
dtb-marvell - update to 6.4.0-150600.23.125.1
dtb-apple - update to 6.4.0-150600.23.125.1
dtb-exynos - update to 6.4.0-150600.23.125.1
dtb-allwinner - update to 6.4.0-150600.23.125.1
kernel-64kb-debugsource - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
dtb-hisilicon - update to 6.4.0-150600.23.125.1
cluster-md-kmp-64kb - update to 6.4.0-150600.23.125.1
kernel-64kb-devel-debuginfo - addressed in versions 6.4.0-150600.23.125.1, 6.4.0-150700.53.73.2
dtb-renesas - update to 6.4.0-150600.23.125.1
dtb-arm - update to 6.4.0-150600.23.125.1
dtb-qcom - update to 6.4.0-150600.23.125.1
dtb-broadcom - update to 6.4.0-150600.23.125.1
dtb-altera - update to 6.4.0-150600.23.125.1
kselftests-kmp-64kb - update to 6.4.0-150600.23.125.1
kernel-64kb-optional - update to 6.4.0-150600.23.125.1
kernel-default-base-rebuild - update to 6.4.0-150600.23.125.1.150600.12.58.3
kernel-default-base - addressed in versions 6.4.0-150600.23.125.1.150600.12.58.3, 6.4.0-150700.53.73.2.150700.17.41.4
kernel-rt-devel-debuginfo - update to 6.4.0-150700.7.67.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.67.1
ocfs2-kmp-rt - update to 6.4.0-150700.7.67.1
gfs2-kmp-rt - update to 6.4.0-150700.7.67.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150700.7.67.1
kernel-rt-devel - update to 6.4.0-150700.7.67.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150700.7.67.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150700.7.67.1
kernel-syms-rt - update to 6.4.0-150700.7.67.1
cluster-md-kmp-rt - update to 6.4.0-150700.7.67.1
dlm-kmp-rt - update to 6.4.0-150700.7.67.1
kernel-rt-debuginfo - update to 6.4.0-150700.7.67.1
kernel-devel-rt - update to 6.4.0-150700.7.67.1
kernel-source-rt - update to 6.4.0-150700.7.67.1
kernel-rt - update to 6.4.0-150700.7.67.1
kernel-rt-debugsource - update to 6.4.0-150700.7.67.1
kernel-azure-debugsource - update to 6.4.0-150700.53.73.2
kernel-azure - update to 6.4.0-150700.53.73.2
kernel-azure-debuginfo - update to 6.4.0-150700.53.73.2
kernel-azure-devel-debuginfo - update to 6.4.0-150700.53.73.2
kernel-azure-devel - update to 6.4.0-150700.53.73.2
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-136.136~22.04.1
linux-oracle-6.8 (Ubuntu package) - update to 6.8.0-1058.61~22.04.1
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1061.64~22.04.1, 6.8.0-1061.64+fips1
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1062.69~22.04.1

External References

Related Security Bulletins