QEMU NVM Express Controller Emulation nvme_ctrl_reset use after free

CVSS Meta Temp Score
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CTI Interest Score
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6.7$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in QEMU. This impacts the function nvme_ctrl_reset of the component NVM Express Controller Emulation. This manipulation causes use after free. This vulnerability is tracked as CVE-2021-3929. No exploit exists. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability has been found in QEMU (Virtualization Software) (the affected version is unknown) and classified as problematic. Affected by this vulnerability is the function nvme_ctrl_reset of the component NVM Express Controller Emulation. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was disclosed 08/26/2022 as 556. The advisory is shared at gitlab.com. This vulnerability is known as CVE-2021-3929 since 11/05/2021. Technical details are known, but no exploit is available.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at gitlab.com.

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Productinfo

Type

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.7

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.2
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: gitlab.com

Timelineinfo

11/05/2021 🔍
08/26/2022 +293 days 🔍
08/26/2022 +0 days 🔍
02/28/2025 +917 days 🔍

Sourcesinfo

Product: qemu.org

Advisory: 556
Status: Confirmed

CVE: CVE-2021-3929 (🔍)
GCVE (CVE): GCVE-0-2021-3929
GCVE (VulDB): GCVE-100-207337

Entryinfo

Created: 08/26/2022 09:34
Updated: 02/28/2025 15:14
Changes: 08/26/2022 09:34 (41), 10/02/2022 08:36 (11), 02/28/2025 15:14 (15)
Complete: 🔍
Cache ID: 216::103

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