High severity · published Aug 25, 2022
CVE-2021-3929
A DMA reentrancy issue was found in the NVM Express Controller (NVME) emulation in QEMU
8.2
CVSS
0.7%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 52% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FE
Fedora · Fedoraproject
35; 36 · source: NVD
QE
Qemu · Qemu
before 7.0.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3929
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-3929
Third Party Advisory
https://access.redhat.com/security/cve/CVE-2021-3929
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2020298
Patch
https://gitlab.com/qemu-project/qemu/-/commit/736b01642d85be832385
Issue Tracking
https://gitlab.com/qemu-project/qemu/-/issues/556
Exploit
https://gitlab.com/qemu-project/qemu/-/issues/782
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XHNN7QJCEQH7AQG5AQP2GEFAQE6K635I/
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