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Vulnerability Details : CVE-2021-22543

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.
Publish Date : 2021-05-26 Last Update Date : 2021-10-16
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) OverflowBypass a restriction or similar
CWE ID 119

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2021:3044: kpatch-patch security update (Important) oval:com.redhat.rhsa:def:20213044 unix
RHSA-2021:3057: kernel security, bug fix, and enhancement update (Important) oval:com.redhat.rhsa:def:20213057 unix
RHSA-2021:3088: kernel-rt security and bug fix update (Important) oval:com.redhat.rhsa:def:20213088 unix
RHSA-2021:3768: kpatch-patch security update (Important) oval:com.redhat.rhsa:def:20213768 unix
RHSA-2021:3801: kernel security and bug fix update (Important) oval:com.redhat.rhsa:def:20213801 unix
RHSA-2021:3802: kernel-rt security and bug fix update (Important) oval:com.redhat.rhsa:def:20213802 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2021-22543

# Product Type Vendor Product Version Update Edition Language
1 OS Linux Linux Kernel 2021-05-18 * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Linux Linux Kernel 1

- References For CVE-2021-22543[email protected]/message/4G5YBUVEPHZYXMKNGBZ3S6INFCTEEL4E/
MLIST [debian-lts-announce] 20211015 [SECURITY] [DLA 2785-1] linux-4.19 security update
MLIST [oss-security] 20210626 Re: CVE-2021-22543 - /dev/kvm LPE[email protected]/message/ROQIXQB7ZAWI3KSGSHR6H5RDUWZI775S/
FEDORA FEDORA-2021-95f2f1cfc7

- Metasploit Modules Related To CVE-2021-22543

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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