Input validation error in Linux kernel - CVE-2025-21863

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Main Vulnerability Database Vulnerabilities #VU105676

Input validation error in Linux kernel - CVE-2025-21863

Published: March 12, 2025 / Updated: May 11, 2025


Vulnerability identifier: #VU105676
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-2025-21863
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper input validation within the io_init_req() function in io_uring/io_uring.c. A local user can perform a denial of service (DoS) attack.


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 Desktop 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Workstation Extension 15
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Public Cloud Module
SUSE Real Time Module
Confidential Computing Module
SUSE Linux Enterprise Live Patching
Basesystem Module
Development Tools Module
Legacy Module
openSUSE Leap
openEuler
Ubuntu
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel-livepatch-6_4_0-150600_10_39-rt
kernel-livepatch-6_4_0-150600_10_39-rt-debuginfo
kernel-livepatch-SLE15-SP6-RT_Update_11-debugsource
kernel-livepatch-SLE15-SP7_Update_1-debugsource
kernel-livepatch-6_4_0-150700_53_3-default-debuginfo
kernel-livepatch-6_4_0-150700_53_3-default
kernel-debugsource
kernel-devel
kernel-source
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python2-perf
python2-perf-debuginfo
kernel
python3-perf
bpftool
bpftool-debuginfo
kernel-debuginfo
python3-perf-debuginfo
kernel-headers
kernel (Red Hat package)
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-intel-iotg (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-azure-fde (Ubuntu package)
reiserfs-kmp-coco
kernel-coco_debug-debugsource
kernel-coco_debug-devel
kernel-coco-debugsource
kernel-devel-coco
kernel-coco_debug-devel-debuginfo
kernel-coco-debuginfo
kernel-coco-vdso-debuginfo
reiserfs-kmp-coco-debuginfo
kernel-coco-devel
kernel-syms-coco
kernel-coco_debug-debuginfo
kernel-coco
kernel-coco_debug
kernel-source-coco
kernel-azure-optional-debuginfo
cluster-md-kmp-azure
ocfs2-kmp-azure
kernel-devel-azure
kernel-source-azure
cluster-md-kmp-azure-debuginfo
kernel-azure-devel
kernel-azure-debugsource
kernel-azure-optional
reiserfs-kmp-azure-debuginfo
kernel-azure-extra
dlm-kmp-azure
kernel-azure-extra-debuginfo
gfs2-kmp-azure-debuginfo
kselftests-kmp-azure-debuginfo
kselftests-kmp-azure
kernel-azure-devel-debuginfo
kernel-azure-vdso
kernel-azure-vdso-debuginfo
kernel-azure
dlm-kmp-azure-debuginfo
kernel-azure-debuginfo
ocfs2-kmp-azure-debuginfo
gfs2-kmp-azure
kernel-syms-azure
reiserfs-kmp-azure
dlm-kmp-rt
kernel-rt_debug-debugsource
kselftests-kmp-rt
kernel-rt_debug-devel
kernel-rt-vdso
kernel-rt-extra
kernel-rt-debugsource
cluster-md-kmp-rt
dlm-kmp-rt-debuginfo
kernel-rt-vdso-debuginfo
kernel-rt-optional-debuginfo
reiserfs-kmp-rt-debuginfo
kernel-rt-optional
ocfs2-kmp-rt
kernel-rt-debuginfo
kernel-rt_debug-devel-debuginfo
kernel-rt_debug-vdso
kernel-rt_debug-debuginfo
kernel-syms-rt
kernel-rt-extra-debuginfo
kernel-rt-devel
kernel-devel-rt
kernel-source-rt
kernel-rt
kernel-rt_debug
reiserfs-kmp-rt
kernel-rt-devel-debuginfo
cluster-md-kmp-rt-debuginfo
gfs2-kmp-rt-debuginfo
ocfs2-kmp-rt-debuginfo
kselftests-kmp-rt-debuginfo
kernel-rt-livepatch-devel
kernel-rt_debug-vdso-debuginfo
gfs2-kmp-rt
cluster-md-kmp-default
ocfs2-kmp-default-debuginfo
kernel-default
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-default-debugsource
kernel-default-debuginfo
gfs2-kmp-default
dlm-kmp-default-debuginfo
kernel-default-extra
ocfs2-kmp-default
cluster-md-kmp-default-debuginfo
dlm-kmp-default
gfs2-kmp-default-debuginfo
kernel-default-extra-debuginfo
kernel-default-livepatch
kernel-64kb
kernel-default-livepatch-devel
kernel-zfcpdump
kernel-64kb-debuginfo
kernel-64kb-debugsource
kernel-64kb-devel
kernel-64kb-devel-debuginfo
kernel-default-devel
kernel-default-devel-debuginfo
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-docs
kernel-obs-build-debugsource
kernel-syms
kernel-macros
kernel-obs-build
kernel-default-base
linux-gke (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-oracle (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-lowlatency (Ubuntu package)
PowerSwitch Z9864F-ON

How to mitigate CVE-2025-21863

Install update from vendor's website.

Linux kernel - update to 6.13.5
kernel-livepatch-6_4_0-150600_10_39-rt - update to 1-150600.1.3.2
kernel-livepatch-6_4_0-150600_10_39-rt-debuginfo - update to 1-150600.1.3.2
kernel-livepatch-SLE15-SP6-RT_Update_11-debugsource - update to 1-150600.1.3.2
kernel-livepatch-SLE15-SP7_Update_1-debugsource - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_3-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_3-default - update to 1-150700.15.3.1
PowerSwitch Z9864F-ON - update to 3.5.0
kernel-debugsource - addressed in versions 4.19.90-2504.4.0.0325, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
kernel-devel - addressed in versions 4.19.90-2504.4.0.0325, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
kernel-source - addressed in versions 4.19.90-2504.4.0.0325, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
kernel-tools - addressed in versions 4.19.90-2504.4.0.0325, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
kernel-tools-debuginfo - addressed in versions 4.19.90-2504.4.0.0325, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
kernel-tools-devel - addressed in versions 4.19.90-2504.4.0.0325, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
perf - addressed in versions 4.19.90-2504.4.0.0325, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
perf-debuginfo - addressed in versions 4.19.90-2504.4.0.0325, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
python2-perf - update to 4.19.90-2504.4.0.0325
python2-perf-debuginfo - update to 4.19.90-2504.4.0.0325
kernel - addressed in versions 4.19.90-2504.4.0.0325, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
python3-perf - addressed in versions 4.19.90-2504.4.0.0325, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
bpftool - addressed in versions 4.19.90-2504.4.0.0325, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
bpftool-debuginfo - addressed in versions 4.19.90-2504.4.0.0325, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
kernel-debuginfo - addressed in versions 4.19.90-2504.4.0.0325, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
python3-perf-debuginfo - addressed in versions 4.19.90-2504.4.0.0325, 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
kernel-headers - addressed in versions 5.10.0-259.0.0.161, 5.10.0-259.0.0.162, 6.6.0-85.0.0.79, 6.6.0-85.0.0.90
kernel (Red Hat package) - update to 5.14.0-570.84.1.el9_6
linux (Ubuntu package) - addressed in versions 5.15.0.184.155, 5.15.0-184.194, 5.15.0-184.194~20.04.1, 5.15.0.186.166, 5.15.0-186.196, 5.15.0-186.196~20.04.1, 5.15.0.1075.78, 5.15.0-1075.79, 5.15.0.1095.94, 5.15.0-1095.103, 5.15.0.1104.100, 5.15.0-1104.109, 5.15.0.1108.107, 5.15.0-1108.114, 5.15.0.1111.115, 5.15.0-1111.120+fips1, 5.15.0.1112.102, 5.15.0.1112.109, 5.15.0-1112.122, 5.15.0-1112.122+fips1, 6.8.0-78.78, 6.8.0-78.78.1, 6.8.0-78.78.1~22.04.1, 6.8.0-1035.37, 6.8.1-1030.31, 6.11.0-26.26, 6.11.0-26.26~24.04.1, 6.11.0-1010.10, 6.11.0-1013.13, 6.11.0-1015.15, 6.11.0-1015.15~24.04.1, 6.11.0-1022.22
linux-aws (Ubuntu package) - addressed in versions 5.15.0.186.109, 5.15.0-186.196+fips1, 5.15.0.1106.103, 5.15.0-1106.110, 5.15.0.1107.107, 5.15.0-1107.108, 5.15.0.1112.108, 5.15.0.1112.115, 5.15.0-1112.119, 5.15.0-1112.119+fips1, 5.15.0-1112.119~20.04.1, 6.11.0-1014.15
linux-nvidia-tegra (Ubuntu package) - addressed in versions 5.15.0-1053.53, 5.15.0.1053.55, 5.15.0.1064.64, 5.15.0-1064.66
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, 5.15.0.1104.108, 5.15.0-1107.113~20.04.1
linux-raspi (Ubuntu package) - addressed in versions 5.15.0.1106.104, 5.15.0-1106.109
linux-intel-iotg (Ubuntu package) - addressed in versions 5.15.0.1107.106, 5.15.0-1107.113
linux-azure (Ubuntu package) - addressed in versions 5.15.0.1109.105, 5.15.0-1109.115, 5.15.0.1117.115, 5.15.0-1117.126, 6.8.0-1022.23, 6.8.0-1034.39, 6.8.0-1034.39~22.04.1
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-gcp-5.15 (Ubuntu package) - update to 5.15.0-1112.122~20.04.1
linux-azure-fips (Ubuntu package) - addressed in versions 5.15.0.1117.102, 5.15.0-1117.126+fips1
linux-azure-fde (Ubuntu package) - update to 5.15.0-1117.126
reiserfs-kmp-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco_debug-debugsource - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco_debug-devel - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco-debugsource - update to 6.4.0-15061.21.coco15sp6.1
kernel-devel-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco_debug-devel-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco-vdso-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
reiserfs-kmp-coco-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco-devel - update to 6.4.0-15061.21.coco15sp6.1
kernel-syms-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco_debug-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco_debug - update to 6.4.0-15061.21.coco15sp6.1
kernel-source-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-azure-optional-debuginfo - update to 6.4.0-150600.8.37.1
cluster-md-kmp-azure - update to 6.4.0-150600.8.37.1
ocfs2-kmp-azure - update to 6.4.0-150600.8.37.1
kernel-devel-azure - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
kernel-source-azure - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
cluster-md-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
kernel-azure-devel - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
kernel-azure-debugsource - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
kernel-azure-optional - update to 6.4.0-150600.8.37.1
reiserfs-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
kernel-azure-extra - update to 6.4.0-150600.8.37.1
dlm-kmp-azure - update to 6.4.0-150600.8.37.1
kernel-azure-extra-debuginfo - update to 6.4.0-150600.8.37.1
gfs2-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
kselftests-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
kselftests-kmp-azure - update to 6.4.0-150600.8.37.1
kernel-azure-devel-debuginfo - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
kernel-azure-vdso - update to 6.4.0-150600.8.37.1
kernel-azure-vdso-debuginfo - update to 6.4.0-150600.8.37.1
kernel-azure - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
dlm-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
kernel-azure-debuginfo - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
ocfs2-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
gfs2-kmp-azure - update to 6.4.0-150600.8.37.1
kernel-syms-azure - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
reiserfs-kmp-azure - update to 6.4.0-150600.8.37.1
dlm-kmp-rt - update to 6.4.0-150600.10.39.1
kernel-rt_debug-debugsource - update to 6.4.0-150600.10.39.1
kselftests-kmp-rt - update to 6.4.0-150600.10.39.1
kernel-rt_debug-devel - update to 6.4.0-150600.10.39.1
kernel-rt-vdso - update to 6.4.0-150600.10.39.1
kernel-rt-extra - update to 6.4.0-150600.10.39.1
kernel-rt-debugsource - update to 6.4.0-150600.10.39.1
cluster-md-kmp-rt - update to 6.4.0-150600.10.39.1
dlm-kmp-rt-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt-vdso-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt-optional-debuginfo - update to 6.4.0-150600.10.39.1
reiserfs-kmp-rt-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt-optional - update to 6.4.0-150600.10.39.1
ocfs2-kmp-rt - update to 6.4.0-150600.10.39.1
kernel-rt-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt_debug-devel-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt_debug-vdso - update to 6.4.0-150600.10.39.1
kernel-rt_debug-debuginfo - update to 6.4.0-150600.10.39.1
kernel-syms-rt - update to 6.4.0-150600.10.39.1
kernel-rt-extra-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt-devel - update to 6.4.0-150600.10.39.1
kernel-devel-rt - update to 6.4.0-150600.10.39.1
kernel-source-rt - update to 6.4.0-150600.10.39.1
kernel-rt - update to 6.4.0-150600.10.39.1
kernel-rt_debug - update to 6.4.0-150600.10.39.1
reiserfs-kmp-rt - update to 6.4.0-150600.10.39.1
kernel-rt-devel-debuginfo - update to 6.4.0-150600.10.39.1
cluster-md-kmp-rt-debuginfo - update to 6.4.0-150600.10.39.1
gfs2-kmp-rt-debuginfo - update to 6.4.0-150600.10.39.1
ocfs2-kmp-rt-debuginfo - update to 6.4.0-150600.10.39.1
kselftests-kmp-rt-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt-livepatch-devel - update to 6.4.0-150600.10.39.1
kernel-rt_debug-vdso-debuginfo - update to 6.4.0-150600.10.39.1
gfs2-kmp-rt - update to 6.4.0-150600.10.39.1
cluster-md-kmp-default - update to 6.4.0-150700.53.3.1
kernel-source - update to 6.4.0-150700.53.3.1
ocfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.3.1
kernel-default - update to 6.4.0-150700.53.3.1
reiserfs-kmp-default - update to 6.4.0-150700.53.3.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.3.1
kernel-default-debugsource - update to 6.4.0-150700.53.3.1
kernel-default-debuginfo - update to 6.4.0-150700.53.3.1
gfs2-kmp-default - update to 6.4.0-150700.53.3.1
dlm-kmp-default-debuginfo - update to 6.4.0-150700.53.3.1
kernel-devel - update to 6.4.0-150700.53.3.1
kernel-default-extra - update to 6.4.0-150700.53.3.1
ocfs2-kmp-default - update to 6.4.0-150700.53.3.1
cluster-md-kmp-default-debuginfo - update to 6.4.0-150700.53.3.1
dlm-kmp-default - update to 6.4.0-150700.53.3.1
gfs2-kmp-default-debuginfo - update to 6.4.0-150700.53.3.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.3.1
kernel-default-livepatch - update to 6.4.0-150700.53.3.1
kernel-64kb - update to 6.4.0-150700.53.3.1
kernel-default-livepatch-devel - update to 6.4.0-150700.53.3.1
kernel-zfcpdump - update to 6.4.0-150700.53.3.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.3.1
kernel-64kb-debugsource - update to 6.4.0-150700.53.3.1
kernel-64kb-devel - update to 6.4.0-150700.53.3.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.3.1
kernel-default-devel - update to 6.4.0-150700.53.3.1
kernel-default-devel-debuginfo - update to 6.4.0-150700.53.3.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.3.1
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.3.1
kernel-docs - update to 6.4.0-150700.53.3.1
kernel-obs-build-debugsource - update to 6.4.0-150700.53.3.1
kernel-syms - update to 6.4.0-150700.53.3.1
kernel-macros - update to 6.4.0-150700.53.3.1
kernel-obs-build - update to 6.4.0-150700.53.3.1
kernel-default-base - update to 6.4.0-150700.53.3.1.150700.17.2.1
linux-gke (Ubuntu package) - addressed in versions 6.8.0-78.78~22.04.1, 6.8.0-1032.36, 6.8.0-1035.38, 6.8.0-1035.38.1, 6.8.0-1035.38~22.04.1, 6.8.0-1035.39
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1019.21~22.04.1, 6.8.0-1033.33, 6.8.0-1033.33~22.04.1, 6.8.0-1035.37~22.04.1, 6.8.0-1036.38, 6.8.0-1036.38~22.04.1
linux-oracle (Ubuntu package) - update to 6.8.0-1032.33~22.04.1
linux-raspi-realtime (Ubuntu package) - update to 6.8.0-2028.29
linux-lowlatency (Ubuntu package) - addressed in versions 6.11.0-1014.15, 6.11.0-1014.15~24.04.1, 6.11.0-1016.17

External References

Related Security Bulletins