CVE-2021-3929

Advisory lineage Upstream: 0 Downstream: 9
Modified
Published: 25 Aug 2022, 19:36
Last modified:28 Feb 2025, 13:07

Vulnerability Summary

Overall Risk (default)
medium
44/100
CVSS Score
8.2 HIGH
v3.1 (nvd)
EPSS Score
4.73% LOW
5% probability -0.16%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

25 Aug 2022, 19:36
Published
Vulnerability first disclosed
28 Feb 2025, 13:07
Last Modified
Vulnerability information updated

Description

A DMA reentrancy issue was found in the NVM Express Controller (NVME) emulation in QEMU. This CVE is similar to CVE-2021-3750 and, just like it, when the reentrancy write triggers the reset function nvme_ctrl_reset(), data structs will be freed leading to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition or, potentially, executing arbitrary code within the context of the QEMU process on the host.

CVSS Metrics

  • v3.1•HIGH•Score: 8.2CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 4.73%• Percentile: 90%

Techniques & Countermeasures

  • CWE-416•Use After Free

    The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

  • fedoraproject•fedora

    35 | 36

  • qemu•qemu

    < 7.0.0

References (7)