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CVE-2021-3750

Published: 2 May 2022

A DMA reentrancy issue was found in the USB EHCI controller emulation of QEMU. EHCI does not verify if the Buffer Pointer overlaps with its MMIO region when it transfers the USB packets. Crafted content may be written to the controller's registers and trigger undesirable actions (such as reset) while the device is still transferring packets. This can ultimately lead 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 execute arbitrary code within the context of the QEMU process on the host. This flaw affects QEMU versions before 7.0.0.

Priority

Medium

CVSS 3 base score: 8.2

Status

Package Release Status
qemu
Launchpad, Ubuntu, Debian
bionic Needed

focal Needed

hirsute Ignored
(reached end-of-life)
impish Needed

jammy Needed

trusty Needed

upstream Needs triage

xenial Needed

Patches:
upstream: https://lists.nongnu.org/archive/html/qemu-devel/2021-08/msg03692.html
upstream: https://lists.nongnu.org/archive/html/qemu-devel/2021-12/msg02356.html (newer)
upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=58e74682baf4e1ad26b064d8c02e5bc99c75c5d9
upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=3ab6fdc91b72e156da22848f0003ff4225690ced

Notes

AuthorNote
mdeslaur
as of 2022-06-09, the proposed patches have not been committed
into the upstream tree

Part of the DMA reentrancy issues

need to investigate the 3rd patch that was not commited

References

Bugs