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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.

Notes

AuthorNote
mdeslaur
Part of the DMA reentrancy issues

Priority

Medium

Cvss 3 Severity Score

8.2

Score breakdown

Status

Package Release Status
qemu
Launchpad, Ubuntu, Debian
bionic
Released (1:2.11+dfsg-1ubuntu7.41)
focal
Released (1:4.2-3ubuntu6.24)
hirsute Ignored
(reached end-of-life)
impish Ignored
(reached end-of-life)
jammy
Released (1:6.2+dfsg-2ubuntu6.6)
kinetic
Released (1:7.0+dfsg-7ubuntu1)
trusty Not vulnerable
(code not present)
upstream Needs triage

xenial Not vulnerable
(code not present)
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=b9d383ab797f54ae5fa8746117770709921dc529 (1/3)
upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=58e74682baf4e1ad26b064d8c02e5bc99c75c5d9 (2/3)
upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=3ab6fdc91b72e156da22848f0003ff4225690ced (3/3)
upstream: https://gitlab.com/qemu-project/qemu/-/commit/3ab6fdc9

Severity score breakdown

Parameter Value
Base score 8.2
Attack vector Local
Attack complexity Low
Privileges required High
User interaction None
Scope Changed
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H