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)jessie, jessie (lts)1:2.1+dfsg-12+deb8u23fixed
stretch (security)1:2.8+dfsg-6+deb9u17fixed
stretch (lts), stretch1:2.8+dfsg-6+deb9u19fixed
buster (security)1:3.1+dfsg-8+deb10u12fixed
bullseye (security)1:5.2+dfsg-11+deb11u2vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
qemusourcejessie(not affected)
qemusourcestretch(not affected)
qemusourcebuster(not affected)


[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) (generic) (specific)
Proposed patchset (generic):
Proposed patchset (specific):
Fixed by: (v7.0.0-rc0)
[jessie] - qemu <not-affected> (Vulnerable code introduced later)

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