CVE-2021-3929

NameCVE-2021-3929
DescriptionA 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
qemu (PTS)bullseye1:5.2+dfsg-11+deb11u3vulnerable
bullseye (security)1:5.2+dfsg-11+deb11u2vulnerable
bookworm1:7.2+dfsg-7+deb12u7fixed
sid, trixie1:9.1.0+ds-8fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
qemusourcestretch(not affected)
qemusourcebuster(not affected)
qemusource(unstable)1:7.0+dfsg-1

Notes

[bullseye] - qemu <ignored> (Minor issue; nvme support preliminary supported)
[buster] - qemu <not-affected> (nvme support preliminary supported; PoC doesn't trigger)
[stretch] - qemu <not-affected> (Vulnerable code introduced later)
https://bugzilla.redhat.com/show_bug.cgi?id=2020298
https://gitlab.com/qemu-project/qemu/-/issues/556 (generic)
https://gitlab.com/qemu-project/qemu/-/issues/782 (specific)
Proposed patchset (generic): https://lists.nongnu.org/archive/html/qemu-devel/2021-08/msg03692.html
Proposed patchset (specific): https://lists.nongnu.org/archive/html/qemu-devel/2022-01/msg04577.html
Fixed by: https://gitlab.com/qemu-project/qemu/-/commit/736b01642d85be832385063f278fe7cd4ffb5221 (v7.0.0-rc0)

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