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CVE-2021-3929

Date: August 25, 2022

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.

Severity Score

Related Resources (11)

https://access.redhat.com/security/cve/CVE-2021-3929
https://gitlab.com/qemu-project/qemu/-/issues/782
https://bugzilla.redhat.com/show_bug.cgi?id=2020298
https://gitlab.com/qemu-project/qemu/-/commit/736b01642d85be832385
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XHNN7QJCEQH7AQG5AQP2GEFAQE6K635I/
https://nvd.nist.gov/vuln/detail/CVE-2021-3929
https://security-tracker.debian.org/tracker/CVE-2021-3929
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XHNN7QJCEQH7AQG5AQP2GEFAQE6K635I/
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3929
https://gitlab.com/qemu-project/qemu/-/issues/556
https://www.mend.io/vulnerability-database/CVE-2021-3929

Severity Score

Weakness Type (CWE)

Use After Free

CWE-416

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): HIGH
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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