Improper Initialization in Linux kernel - CVE-2026-64561

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU140940

Improper Initialization in Linux kernel - CVE-2026-64561

Published: August 4, 2026 / Updated: August 14, 2026


Vulnerability identifier: #VU140940
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-2026-64561
CWE-ID: CWE-665
Exploitation vector: Local access
Exploit availability: Public exploit is available

Vulnerability details

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

The vulnerability exists due to improper state management in the KVM x86 shadow MMU page fault handling code when processing stale page faults after reclaiming shadow pages. A local user can trigger page faults that lead KVM to map memory into an invalid root to cause a denial of service.

The issue occurs when reclaiming shadow pages invalidates an in-use root, causing child shadow pages created during map or fetch operations to inherit an invalid role and violate the invariant that invalid shadow pages must not appear on the list of active MMU pages.


Affected software

Linux kernel
Debian Linux
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Live Patching
openSUSE Leap
openEuler
kernel-livepatch-SLE15-SP7-RT_Update_18-debugsource
kernel-livepatch-6_4_0-150700_7_67-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_67-rt
kernel-livepatch-SLE15-SP4_Update_57-debugsource
kernel-livepatch-5_14_21-150400_24_228-default
kernel-livepatch-5_14_21-150400_24_228-default-debuginfo
kernel-livepatch-6_4_0-150700_7_62-rt-debuginfo
kernel-livepatch-SLE15-SP7-RT_Update_17-debugsource
kernel-livepatch-6_4_0-150700_7_62-rt
kernel-livepatch-5_14_21-150400_24_225-default-debuginfo
kernel-livepatch-5_14_21-150400_24_219-default
kernel-livepatch-5_14_21-150400_24_225-default
kernel-livepatch-SLE15-SP4_Update_55-debugsource
kernel-livepatch-5_14_21-150400_24_222-default-debuginfo
kernel-livepatch-5_14_21-150400_24_222-default
kernel-livepatch-5_14_21-150400_24_219-default-debuginfo
kernel-livepatch-SLE15-SP4_Update_54-debugsource
kernel-livepatch-SLE15-SP4_Update_56-debugsource
kernel-livepatch-6_4_0-150700_7_59-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_54-rt
kernel-livepatch-6_4_0-150700_7_54-rt-debuginfo
kernel-livepatch-SLE15-SP7-RT_Update_16-debugsource
kernel-livepatch-SLE15-SP7-RT_Update_15-debugsource
kernel-livepatch-6_4_0-150700_7_59-rt
python3-perf-debuginfo
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-extra-modules
kernel-headers
python3-perf
kernel-source
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
linux (Debian package)
kernel-livepatch-SLE15-SP4_Update_53-debugsource
kernel-livepatch-5_14_21-150400_24_214-default
kernel-livepatch-5_14_21-150400_24_214-default-debuginfo
kernel-livepatch-6_4_0-150700_7_51-rt
kernel-livepatch-6_4_0-150700_7_51-rt-debuginfo
kernel-livepatch-SLE15-SP7-RT_Update_14-debugsource
kernel-livepatch-5_14_21-150400_24_209-default
kernel-livepatch-5_14_21-150400_24_209-default-debuginfo
kernel-livepatch-SLE15-SP4_Update_52-debugsource
kernel-livepatch-5_14_21-150500_55_163-default-debuginfo
kernel-livepatch-5_14_21-150500_55_163-default
kernel-livepatch-SLE15-SP5_Update_39-debugsource
kernel-livepatch-6_4_0-150700_7_44-rt
kernel-livepatch-SLE15-SP7_Update_13-debugsource
kernel-livepatch-SLE15-SP7-RT_Update_13-debugsource
kernel-livepatch-6_4_0-150700_53_45-default
kernel-livepatch-6_4_0-150700_53_45-default-debuginfo
kernel-livepatch-6_4_0-150700_7_44-rt-debuginfo
kernel-livepatch-SLE15-SP4_Update_51-debugsource
kernel-livepatch-5_14_21-150400_24_205-default-debuginfo
kernel-livepatch-5_14_21-150400_24_205-default
kernel-livepatch-SLE15-SP7-RT_Update_12-debugsource
kernel-livepatch-6_4_0-150700_7_40-rt
kernel-livepatch-6_4_0-150700_7_40-rt-debuginfo
kernel-livepatch-5_14_21-150400_24_197-default-debuginfo
kernel-livepatch-5_14_21-150400_24_197-default
kernel-livepatch-5_14_21-150400_24_200-default
kernel-livepatch-5_14_21-150400_24_200-default-debuginfo
kernel-livepatch-SLE15-SP4_Update_50-debugsource
kernel-livepatch-SLE15-SP4_Update_49-debugsource
kernel-livepatch-SLE15-SP5_Update_36-debugsource
kernel-livepatch-5_14_21-150500_55_144-default-debuginfo
kernel-livepatch-5_14_21-150500_55_144-default
kernel-livepatch-5_14_21-150500_55_141-default-debuginfo
kernel-livepatch-5_14_21-150500_55_141-default
kernel-livepatch-SLE15-SP5_Update_37-debugsource
kernel-livepatch-6_4_0-150700_7_37-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_37-rt
kernel-livepatch-6_4_0-150700_7_34-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_34-rt
kernel-livepatch-SLE15-SP7-RT_Update_10-debugsource
kernel-livepatch-SLE15-SP7-RT_Update_11-debugsource
kernel-livepatch-5_14_21-150400_24_194-default
kernel-livepatch-SLE15-SP4_Update_48-debugsource
kernel-livepatch-5_14_21-150400_24_194-default-debuginfo
kernel-livepatch-SLE15-SP7-RT_Update_9-debugsource
kernel-livepatch-6_4_0-150700_7_31-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_31-rt
kernel-livepatch-5_14_21-150500_55_136-default
kernel-livepatch-5_14_21-150500_55_136-default-debuginfo
kernel-livepatch-SLE15-SP5_Update_35-debugsource
kernel-livepatch-SLE15-SP7-RT_Update_7-debugsource
kernel-livepatch-6_4_0-150700_7_25-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_28-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_28-rt
kernel-livepatch-SLE15-SP7-RT_Update_8-debugsource
kernel-livepatch-6_4_0-150700_7_25-rt
kernel-livepatch-5_14_21-150400_24_187-default
kernel-livepatch-5_14_21-150400_24_187-default-debuginfo
kernel-livepatch-5_14_21-150400_24_184-default-debuginfo
kernel-livepatch-SLE15-SP4_Update_46-debugsource
kernel-livepatch-SLE15-SP4_Update_47-debugsource
kernel-livepatch-5_14_21-150400_24_184-default
kernel-livepatch-SLE15-SP5_Update_33-debugsource
kernel-livepatch-5_14_21-150500_55_133-default
kernel-livepatch-5_14_21-150500_55_127-default
kernel-livepatch-5_14_21-150500_55_127-default-debuginfo
kernel-livepatch-5_14_21-150500_55_130-default-debuginfo
kernel-livepatch-5_14_21-150500_55_133-default-debuginfo
kernel-livepatch-SLE15-SP5_Update_32-debugsource
kernel-livepatch-SLE15-SP5_Update_34-debugsource
kernel-livepatch-5_14_21-150500_55_130-default
kernel-livepatch-SLE15-SP7-RT_Update_6-debugsource
kernel-livepatch-6_4_0-150700_7_22-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_22-rt
kernel-livepatch-SLE15-SP6_Update_16-debugsource
kernel-livepatch-6_4_0-150600_23_73-default-debuginfo
kernel-livepatch-6_4_0-150600_23_73-default
kernel-livepatch-6_4_0-150700_7_19-rt-debuginfo
kernel-livepatch-SLE15-SP7-RT_Update_5-debugsource
kernel-livepatch-6_4_0-150700_7_19-rt
kernel-livepatch-5_14_21-150500_55_124-default-debuginfo
kernel-livepatch-5_14_21-150500_55_124-default
kernel-livepatch-SLE15-SP5_Update_31-debugsource
kernel-livepatch-SLE15-SP4_Update_45-debugsource
kernel-livepatch-5_14_21-150400_24_179-default
kernel-livepatch-5_14_21-150400_24_179-default-debuginfo
kernel-livepatch-6_4_0-150700_7_16-rt
kernel-livepatch-SLE15-SP7-RT_Update_3-debugsource
kernel-livepatch-SLE15-SP7-RT_Update_4-debugsource
kernel-livepatch-6_4_0-150700_7_16-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_13-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_13-rt
kernel-livepatch-5_14_21-150500_55_121-default
kernel-livepatch-5_14_21-150500_55_121-default-debuginfo
kernel-livepatch-SLE15-SP5_Update_30-debugsource
kernel-livepatch-SLE15-SP4_Update_44-debugsource
kernel-livepatch-5_14_21-150400_24_176-default-debuginfo
kernel-livepatch-5_14_21-150400_24_176-default
kernel-livepatch-5_14_21-150400_24_173-default
kernel-livepatch-SLE15-SP4_Update_43-debugsource
kernel-livepatch-5_14_21-150400_24_173-default-debuginfo

How to mitigate CVE-2026-64561

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-livepatch-SLE15-SP7-RT_Update_18-debugsource - update to 2-150700.2.1
kernel-livepatch-6_4_0-150700_7_67-rt-debuginfo - update to 2-150700.2.1
kernel-livepatch-6_4_0-150700_7_67-rt - update to 2-150700.2.1
kernel-livepatch-SLE15-SP4_Update_57-debugsource - update to 3-150400.2.1
kernel-livepatch-5_14_21-150400_24_228-default - update to 3-150400.2.1
kernel-livepatch-5_14_21-150400_24_228-default-debuginfo - update to 3-150400.2.1
kernel-livepatch-6_4_0-150700_7_62-rt-debuginfo - update to 4-150700.2.1
kernel-livepatch-SLE15-SP7-RT_Update_17-debugsource - update to 4-150700.2.1
kernel-livepatch-6_4_0-150700_7_62-rt - update to 4-150700.2.1
kernel-livepatch-5_14_21-150400_24_225-default-debuginfo - update to 5-150400.2.1
kernel-livepatch-5_14_21-150400_24_219-default - update to 5-150400.2.1
kernel-livepatch-5_14_21-150400_24_225-default - update to 5-150400.2.1
kernel-livepatch-SLE15-SP4_Update_55-debugsource - update to 5-150400.2.1
kernel-livepatch-5_14_21-150400_24_222-default-debuginfo - update to 5-150400.2.1
kernel-livepatch-5_14_21-150400_24_222-default - update to 5-150400.2.1
kernel-livepatch-5_14_21-150400_24_219-default-debuginfo - update to 5-150400.2.1
kernel-livepatch-SLE15-SP4_Update_54-debugsource - update to 5-150400.2.1
kernel-livepatch-SLE15-SP4_Update_56-debugsource - update to 5-150400.2.1
kernel-livepatch-6_4_0-150700_7_59-rt-debuginfo - update to 5-150700.2.1
kernel-livepatch-6_4_0-150700_7_54-rt - update to 5-150700.2.1
kernel-livepatch-6_4_0-150700_7_54-rt-debuginfo - update to 5-150700.2.1
kernel-livepatch-SLE15-SP7-RT_Update_16-debugsource - update to 5-150700.2.1
kernel-livepatch-SLE15-SP7-RT_Update_15-debugsource - update to 5-150700.2.1
kernel-livepatch-6_4_0-150700_7_59-rt - update to 5-150700.2.1
python3-perf-debuginfo - update to 6.6.0-145.3.29.160
kernel - update to 6.6.0-145.3.29.160
bpftool - update to 6.6.0-145.3.29.160
bpftool-debuginfo - update to 6.6.0-145.3.29.160
kernel-debuginfo - update to 6.6.0-145.3.29.160
kernel-debugsource - update to 6.6.0-145.3.29.160
kernel-devel - update to 6.6.0-145.3.29.160
kernel-extra-modules - update to 6.6.0-145.3.29.160
kernel-headers - update to 6.6.0-145.3.29.160
python3-perf - update to 6.6.0-145.3.29.160
kernel-source - update to 6.6.0-145.3.29.160
kernel-tools - update to 6.6.0-145.3.29.160
kernel-tools-debuginfo - update to 6.6.0-145.3.29.160
kernel-tools-devel - update to 6.6.0-145.3.29.160
perf - update to 6.6.0-145.3.29.160
perf-debuginfo - update to 6.6.0-145.3.29.160
linux (Debian package) - update to 6.12.101-1
kernel-livepatch-SLE15-SP4_Update_53-debugsource - update to 6-150400.2.1
kernel-livepatch-5_14_21-150400_24_214-default - update to 6-150400.2.1
kernel-livepatch-5_14_21-150400_24_214-default-debuginfo - update to 6-150400.2.1
kernel-livepatch-6_4_0-150700_7_51-rt - update to 6-150700.2.1
kernel-livepatch-6_4_0-150700_7_51-rt-debuginfo - update to 6-150700.2.1
kernel-livepatch-SLE15-SP7-RT_Update_14-debugsource - update to 6-150700.2.1
kernel-livepatch-5_14_21-150400_24_209-default - update to 7-150400.2.1
kernel-livepatch-5_14_21-150400_24_209-default-debuginfo - update to 7-150400.2.1
kernel-livepatch-SLE15-SP4_Update_52-debugsource - update to 7-150400.2.1
kernel-livepatch-5_14_21-150500_55_163-default-debuginfo - update to 7-150500.2.1
kernel-livepatch-5_14_21-150500_55_163-default - update to 7-150500.2.1
kernel-livepatch-SLE15-SP5_Update_39-debugsource - update to 7-150500.2.1
kernel-livepatch-6_4_0-150700_7_44-rt - update to 7-150700.2.1
kernel-livepatch-SLE15-SP7_Update_13-debugsource - update to 7-150700.2.1
kernel-livepatch-SLE15-SP7-RT_Update_13-debugsource - update to 7-150700.2.1
kernel-livepatch-6_4_0-150700_53_45-default - update to 7-150700.2.1
kernel-livepatch-6_4_0-150700_53_45-default-debuginfo - update to 7-150700.2.1
kernel-livepatch-6_4_0-150700_7_44-rt-debuginfo - update to 7-150700.2.1
kernel-livepatch-SLE15-SP4_Update_51-debugsource - update to 8-150400.2.1
kernel-livepatch-5_14_21-150400_24_205-default-debuginfo - update to 8-150400.2.1
kernel-livepatch-5_14_21-150400_24_205-default - update to 8-150400.2.1
kernel-livepatch-SLE15-SP7-RT_Update_12-debugsource - update to 8-150700.2.1
kernel-livepatch-6_4_0-150700_7_40-rt - update to 8-150700.2.1
kernel-livepatch-6_4_0-150700_7_40-rt-debuginfo - update to 8-150700.2.1
kernel-livepatch-5_14_21-150400_24_197-default-debuginfo - update to 9-150400.2.1
kernel-livepatch-5_14_21-150400_24_197-default - update to 9-150400.2.1
kernel-livepatch-5_14_21-150400_24_200-default - update to 9-150400.2.1
kernel-livepatch-5_14_21-150400_24_200-default-debuginfo - update to 9-150400.2.1
kernel-livepatch-SLE15-SP4_Update_50-debugsource - update to 9-150400.2.1
kernel-livepatch-SLE15-SP4_Update_49-debugsource - update to 9-150400.2.1
kernel-livepatch-SLE15-SP5_Update_36-debugsource - update to 9-150500.2.1
kernel-livepatch-5_14_21-150500_55_144-default-debuginfo - update to 9-150500.2.1
kernel-livepatch-5_14_21-150500_55_144-default - update to 9-150500.2.1
kernel-livepatch-5_14_21-150500_55_141-default-debuginfo - update to 9-150500.2.1
kernel-livepatch-5_14_21-150500_55_141-default - update to 9-150500.2.1
kernel-livepatch-SLE15-SP5_Update_37-debugsource - update to 9-150500.2.1
kernel-livepatch-6_4_0-150700_7_37-rt-debuginfo - update to 9-150700.2.1
kernel-livepatch-6_4_0-150700_7_37-rt - update to 9-150700.2.1
kernel-livepatch-6_4_0-150700_7_34-rt-debuginfo - update to 9-150700.2.1
kernel-livepatch-6_4_0-150700_7_34-rt - update to 9-150700.2.1
kernel-livepatch-SLE15-SP7-RT_Update_10-debugsource - update to 9-150700.2.1
kernel-livepatch-SLE15-SP7-RT_Update_11-debugsource - update to 9-150700.2.1
kernel-livepatch-5_14_21-150400_24_194-default - update to 11-150400.2.1
kernel-livepatch-SLE15-SP4_Update_48-debugsource - update to 11-150400.2.1
kernel-livepatch-5_14_21-150400_24_194-default-debuginfo - update to 11-150400.2.1
kernel-livepatch-SLE15-SP7-RT_Update_9-debugsource - update to 11-150700.2.1
kernel-livepatch-6_4_0-150700_7_31-rt-debuginfo - update to 11-150700.2.1
kernel-livepatch-6_4_0-150700_7_31-rt - update to 11-150700.2.1
kernel-livepatch-5_14_21-150500_55_136-default - update to 12-150500.2.1
kernel-livepatch-5_14_21-150500_55_136-default-debuginfo - update to 12-150500.2.1
kernel-livepatch-SLE15-SP5_Update_35-debugsource - update to 12-150500.2.1
kernel-livepatch-SLE15-SP7-RT_Update_7-debugsource - update to 12-150700.2.1
kernel-livepatch-6_4_0-150700_7_25-rt-debuginfo - update to 12-150700.2.1
kernel-livepatch-6_4_0-150700_7_28-rt-debuginfo - update to 12-150700.2.1
kernel-livepatch-6_4_0-150700_7_28-rt - update to 12-150700.2.1
kernel-livepatch-SLE15-SP7-RT_Update_8-debugsource - update to 12-150700.2.1
kernel-livepatch-6_4_0-150700_7_25-rt - update to 12-150700.2.1
kernel-livepatch-5_14_21-150400_24_187-default - update to 13-150400.2.1
kernel-livepatch-5_14_21-150400_24_187-default-debuginfo - update to 13-150400.2.1
kernel-livepatch-5_14_21-150400_24_184-default-debuginfo - update to 13-150400.2.1
kernel-livepatch-SLE15-SP4_Update_46-debugsource - update to 13-150400.2.1
kernel-livepatch-SLE15-SP4_Update_47-debugsource - update to 13-150400.2.1
kernel-livepatch-5_14_21-150400_24_184-default - update to 13-150400.2.1
kernel-livepatch-SLE15-SP5_Update_33-debugsource - update to 13-150500.2.1
kernel-livepatch-5_14_21-150500_55_133-default - update to 13-150500.2.1
kernel-livepatch-5_14_21-150500_55_127-default - update to 13-150500.2.1
kernel-livepatch-5_14_21-150500_55_127-default-debuginfo - update to 13-150500.2.1
kernel-livepatch-5_14_21-150500_55_130-default-debuginfo - update to 13-150500.2.1
kernel-livepatch-5_14_21-150500_55_133-default-debuginfo - update to 13-150500.2.1
kernel-livepatch-SLE15-SP5_Update_32-debugsource - update to 13-150500.2.1
kernel-livepatch-SLE15-SP5_Update_34-debugsource - update to 13-150500.2.1
kernel-livepatch-5_14_21-150500_55_130-default - update to 13-150500.2.1
kernel-livepatch-SLE15-SP7-RT_Update_6-debugsource - update to 13-150700.2.1
kernel-livepatch-6_4_0-150700_7_22-rt-debuginfo - update to 13-150700.2.1
kernel-livepatch-6_4_0-150700_7_22-rt - update to 13-150700.2.1
kernel-livepatch-SLE15-SP6_Update_16-debugsource - update to 14-150600.2.1
kernel-livepatch-6_4_0-150600_23_73-default-debuginfo - update to 14-150600.2.1
kernel-livepatch-6_4_0-150600_23_73-default - update to 14-150600.2.1
kernel-livepatch-6_4_0-150700_7_19-rt-debuginfo - update to 14-150700.2.1
kernel-livepatch-SLE15-SP7-RT_Update_5-debugsource - update to 14-150700.2.1
kernel-livepatch-6_4_0-150700_7_19-rt - update to 14-150700.2.1
kernel-livepatch-5_14_21-150500_55_124-default-debuginfo - update to 16-150500.2.1
kernel-livepatch-5_14_21-150500_55_124-default - update to 16-150500.2.1
kernel-livepatch-SLE15-SP5_Update_31-debugsource - update to 16-150500.2.1
kernel-livepatch-SLE15-SP4_Update_45-debugsource - update to 17-150400.2.1
kernel-livepatch-5_14_21-150400_24_179-default - update to 17-150400.2.1
kernel-livepatch-5_14_21-150400_24_179-default-debuginfo - update to 17-150400.2.1
kernel-livepatch-6_4_0-150700_7_16-rt - update to 17-150700.2.1
kernel-livepatch-SLE15-SP7-RT_Update_3-debugsource - update to 17-150700.2.1
kernel-livepatch-SLE15-SP7-RT_Update_4-debugsource - update to 17-150700.2.1
kernel-livepatch-6_4_0-150700_7_16-rt-debuginfo - update to 17-150700.2.1
kernel-livepatch-6_4_0-150700_7_13-rt-debuginfo - update to 17-150700.2.1
kernel-livepatch-6_4_0-150700_7_13-rt - update to 17-150700.2.1
kernel-livepatch-5_14_21-150500_55_121-default - update to 18-150500.2.1
kernel-livepatch-5_14_21-150500_55_121-default-debuginfo - update to 18-150500.2.1
kernel-livepatch-SLE15-SP5_Update_30-debugsource - update to 18-150500.2.1
kernel-livepatch-SLE15-SP4_Update_44-debugsource - update to 19-150400.2.1
kernel-livepatch-5_14_21-150400_24_176-default-debuginfo - update to 19-150400.2.1
kernel-livepatch-5_14_21-150400_24_176-default - update to 19-150400.2.1
kernel-livepatch-5_14_21-150400_24_173-default - update to 20-150400.2.1
kernel-livepatch-SLE15-SP4_Update_43-debugsource - update to 20-150400.2.1
kernel-livepatch-5_14_21-150400_24_173-default-debuginfo - update to 20-150400.2.1

Links to Public Exploits and PoC-codes

External References

Related Security Bulletins