CVE details
CVE-2021-3929
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.
Affected ports (2)
| Port | Package | Version | Status | Maintainer |
|---|---|---|---|---|
| emulators/qemu-cheri | qemu-cheri | 0.d20260108 | unaddressed | brooks@FreeBSD.org |
| emulators/qemu-user-static | qemu-user-static | 3.1.0_16 | unaddressed | emulation@FreeBSD.org |
Template for a VuXML entry
Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.
<vuln vid="FIXME (make newentry)">
<topic>FIXME -- FIXME</topic>
<affects>
<package>
<name>qemu-cheri</name>
<range><lt>7.0.0</lt></range>
</package>
<package>
<name>qemu-user-static</name>
<range><lt>7.0.0</lt></range>
</package>
</affects>
<description>
<body xmlns="http://www.w3.org/1999/xhtml">
<p>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.</p>
</body>
</description>
<references>
<cvename>CVE-2021-3929</cvename>
<url>https://nvd.nist.gov/vuln/detail/CVE-2021-3929</url>
</references>
<dates>
<discovery>2022-08-25</discovery>
<entry>2026-10-25</entry>
</dates>
</vuln>