CVE-2021-22543

Description

An 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.

Problem types

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

Product status

Credits

David Stevens 0x400822c8c0

Kevin Hamacher 0x400822c8d0

Jann Horn 0x400822c8e0

References

https://github.com/google/security-research/security/advisories/GHSA-7wq5-phmq-m584

http://www.openwall.com/lists/oss-security/2021/06/26/1 ([oss-security] 20210626 Re: CVE-2021-22543 - /dev/kvm LPE) mailing-list

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4G5YBUVEPHZYXMKNGBZ3S6INFCTEEL4E/ (FEDORA-2021-fe826f202e) vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ROQIXQB7ZAWI3KSGSHR6H5RDUWZI775S/ (FEDORA-2021-95f2f1cfc7) vendor-advisory

https://security.netapp.com/advisory/ntap-20210708-0002/

https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html ([debian-lts-announce] 20211015 [SECURITY] [DLA 2785-1] linux-4.19 security update) mailing-list

https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html ([debian-lts-announce] 20211216 [SECURITY] [DLA 2843-1] linux security update) mailing-list

cve.org CVE-2021-22543

nvd.nist.gov CVE-2021-22543

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