DescriptionA DMA reentrancy issue was found in the Tulip device emulation in QEMU. When Tulip reads or writes to the rx/tx descriptor or copies the rx/tx frame, it doesn't check whether the destination address is its own MMIO address. This can cause the device to trigger MMIO handlers multiple times, possibly leading to a stack or heap overflow. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1018055

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+deb11u2fixed

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

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


[bullseye] - qemu <not-affected> (Vulnerable code not present)
[buster] - qemu <not-affected> (Vulnerable code/Tulip NIC emulator added later)
Fixed by: (v7.2.0-rc0)
Introduced by (v7.0.0-rc0)
[stretch] - qemu <not-affected> (Vulnerable code/Tulip NIC emulator added later)
[jessie] - qemu <not-affected> (Vulnerable code/Tulip NIC emulator added later)

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