CVEvulnerability

CVE-2021-20181

7.5 HIGH Published 2021-05-13 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-05-13
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS 2.0 ([email protected])
6.9 MEDIUM — AV:L/AC:M/Au:N/C:C/I:C/A:C
Weaknesses
CWE-362, CWE-367

Description

A race condition flaw was found in the 9pfs server implementation of QEMU up to and including 5.2.0. This flaw allows a malicious 9p client to cause a use-after-free error, potentially escalating their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.

Affected configurations

• qemu qemu (<= 5.2.0) • debian debian linux 9.0 • debian debian linux 10.0

Related

Weakness · CWE (2)

  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization weakness
  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition weakness

References