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kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks

🗓️ 31 Aug 2021 08:56:13Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 9 Views

Kernel KVM mismanages virtual memory areas, bypassing read-only checks and freeing pages.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.2x86_64kernel-rt4.18.0-193.64.1.rt13.115.el8_2kernel-rt-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
Red Hat Enterprise Linux8.2x86_64kernel-rt-core4.18.0-193.64.1.rt13.115.el8_2kernel-rt-core-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
Red Hat Enterprise Linux8.2x86_64kernel-rt-debug4.18.0-193.64.1.rt13.115.el8_2kernel-rt-debug-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
Red Hat Enterprise Linux8.2x86_64kernel-rt-debug-core4.18.0-193.64.1.rt13.115.el8_2kernel-rt-debug-core-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
Red Hat Enterprise Linux8.2x86_64kernel-rt-debug-debuginfo4.18.0-193.64.1.rt13.115.el8_2kernel-rt-debug-debuginfo-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
Red Hat Enterprise Linux8.2x86_64kernel-rt-debug-devel4.18.0-193.64.1.rt13.115.el8_2kernel-rt-debug-devel-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
Red Hat Enterprise Linux8.2x86_64kernel-rt-debug-kvm4.18.0-193.64.1.rt13.115.el8_2kernel-rt-debug-kvm-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
Red Hat Enterprise Linux8.2x86_64kernel-rt-debug-modules4.18.0-193.64.1.rt13.115.el8_2kernel-rt-debug-modules-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
Red Hat Enterprise Linux8.2x86_64kernel-rt-debug-modules-extra4.18.0-193.64.1.rt13.115.el8_2kernel-rt-debug-modules-extra-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
Red Hat Enterprise Linux8.2x86_64kernel-rt-debuginfo4.18.0-193.64.1.rt13.115.el8_2kernel-rt-debuginfo-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
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11 Jul 2026 17:41Current
7High risk
Vulners AI Score7
CVSS 24.6
CVSS 3.17.8
CVSS 48.7
EPSS0.0066
CWE-863
linux kernelvirtual memory areasread only checkspage freeingprivilege escalation
9