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

🗓️ 12 Oct 2021 16:12:12Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 4 Views

KVM flaw: PFN MAP VMAs bypass RO checks, freeing pages accessible to VMM and guest, enabling local privilege escalation.

Related
Packages
Refs
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IBM Security Bulletins		Security Bulletin: IBM Data Risk Manager is affected by multiple vulnerabilities
13 Jan 202215:19
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IBM Security Bulletins		Security Bulletin: Multiple vulnerabilities in Linux Kernel affect IBM QRadar SIEM (CVE-2021-22543, CVE-2021-3653, CVE-2021-3656, CVE-2021-37576)
28 Apr 202220:56
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IBM Security Bulletins		Security Bulletin: Publicly disclosed vulnerability from Kernel affects IBM Netezza Host Management
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IBM Security Bulletins		Security Bulletin: Cloud Pak for Security uses packages that are vulnerable to several CVEs
19 Oct 202115:38
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Tenable Nessus		Amazon Linux 2 : kernel (ALAS-2021-1699)
29 Sep 202100:00
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Tenable Nessus		Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.10-2022-002 (ALASKERNEL-5.10-2022-002)
2 May 202200:00
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Tenable Nessus		Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.4-2022-004 (ALASKERNEL-5.4-2022-004)
2 May 202200:00
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Tenable Nessus		Amazon Linux AMI : kernel (ALAS-2021-1539)
4 Oct 202100:00
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Tenable Nessus		AlmaLinux 8 : kernel (ALSA-2021:3057)
9 Feb 202200:00
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Tenable Nessus		CentOS 8 : kernel (CESA-2021:3057)
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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux7ppc64bpftool3.10.0-1160.45.1.el7bpftool-3.10.0-1160.45.1.el7.ppc64.rpm
Red Hat Enterprise Linux7ppc64lebpftool3.10.0-1160.45.1.el7bpftool-3.10.0-1160.45.1.el7.ppc64le.rpm
Red Hat Enterprise Linux7s390xbpftool3.10.0-1160.45.1.el7bpftool-3.10.0-1160.45.1.el7.s390x.rpm
Red Hat Enterprise Linux7x86_64bpftool3.10.0-1160.45.1.el7bpftool-3.10.0-1160.45.1.el7.x86_64.rpm
Red Hat Enterprise Linux7ppc64bpftool-debuginfo3.10.0-1160.45.1.el7bpftool-debuginfo-3.10.0-1160.45.1.el7.ppc64.rpm
Red Hat Enterprise Linux7ppc64lebpftool-debuginfo3.10.0-1160.45.1.el7bpftool-debuginfo-3.10.0-1160.45.1.el7.ppc64le.rpm
Red Hat Enterprise Linux7s390xbpftool-debuginfo3.10.0-1160.45.1.el7bpftool-debuginfo-3.10.0-1160.45.1.el7.s390x.rpm
Red Hat Enterprise Linux7x86_64bpftool-debuginfo3.10.0-1160.45.1.el7bpftool-debuginfo-3.10.0-1160.45.1.el7.x86_64.rpm
Red Hat Enterprise Linux7ppc64kernel3.10.0-1160.45.1.el7kernel-3.10.0-1160.45.1.el7.ppc64.rpm
Red Hat Enterprise Linux7ppc64lekernel3.10.0-1160.45.1.el7kernel-3.10.0-1160.45.1.el7.ppc64le.rpm
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28 Jun 2026 12:11Current
7High risk
Vulners AI Score7
CVSS 24.6
CVSS 3.17.8
CVSS 48.7
EPSS0.0066
CWE-863
linux kernelkvm vulnerabilitypfn map vmapsread only bypasslocal privilege escalationmemory access
4