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CVE-2021-22543

Improper memory handling in Linux KVM

Published: May 26, 2021Updated: Nov 21, 2024 Sources: CVE List NVD BDUCWE-119
NVD MITRE
7.8CVSSHIGH
EPSS Score
0.7%
Top 53.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-119

Affected Products

Red Hat Enterprise LinuxRed Hat Inc.
On-premOS
Operating Systems / linux-distro
Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
UbuntuCanonical Ltd.
On-premOS
Operating Systems / linux-distro
Astra Linux Special EditionООО «РусБИТех-Астра»
On-premOS
Operating Systems / linux-distro
OpenSUSE LeapNovell Inc.
On-premOS
Operating Systems / linux-distro
red hat inc.commercialUSOperating Systemsaka red hat
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
canonical ltd.commercialGBOperating Systemsaka canonical
ооо «русбитех-астра»commercialRUOperating Systemsaka rusbitech-astra
novell inc.commercialUSOperating Systems
and 18 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

http://www.openwall.com/lists/oss-security/2021/05/26/3
openwall.com
http://www.openwall.com/lists/oss-security/2021/05/26/4
openwall.com
http://www.openwall.com/lists/oss-security/2021/05/26/5
openwall.com
and 46 more references View all →

Timeline

Published
May 26, 2021
Last Updated
Nov 21, 2024

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