Race Condition Vulnerability in QEMU 9pfs Server Implementation
CVE-2021-20181

7.5HIGH

Key Information:

Vendor

Qemu
Status
Qemu
Vendor
CVE Published:
13 May 2021

What is CVE-2021-20181?

A race condition flaw exists within the 9pfs server implementation of QEMU versions up to 5.2.0. This vulnerability can be exploited by a malicious 9p client, leading to a use-after-free error, which may result in unauthorized privilege escalation on the affected system. The impact extends to critical aspects such as confidentiality, integrity, and the overall availability of the system.

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Affected Version(s)

qemu up to, including 5.2.0

References

https://www.zerodayinitiative.com/advisories/ZDI-21-159/
x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2021/02/msg0...
mailing-listx_refsource_MLIST
https://bugzilla.redhat.com/show_bug.cgi?id=1927007
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
High
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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