CVE-2021-22543

NameCVE-2021-22543
DescriptionAn issue was discovered in Linux: KVM through Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks and can lead to pages being freed while still accessible by the VMM and guest. This allows users with the ability to start and control a VM to read/write random pages of memory and can result in local privilege escalation.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)stretch4.9.228-1vulnerable
stretch (security)4.9.272-2vulnerable
buster4.19.194-1vulnerable
buster (security)4.19.194-3vulnerable
bookworm, sid, bullseye5.10.46-4fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)5.10.46-2

Notes

https://www.openwall.com/lists/oss-security/2021/05/26/3
https://github.com/google/security-research/security/advisories/GHSA-7wq5-phmq-m584
https://git.kernel.org/linus/f8be156be163a052a067306417cd0ff679068c97

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