CVE-2021-3750
Description
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Mixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 1:7.0+dfsg-1 |
| sid | Fixed | 1:7.0+dfsg-1 |
| forky | Fixed | 1:7.0+dfsg-1 |
| bullseye | Affected | — |
| bookworm | Fixed | 1:7.0+dfsg-1 |
AlmaLinux Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| 9 | Fixed | qemu-kvm-device-display-virtio-gpu-gl-7.0.0-13.el9.aarch64.rpm |
Red Hat Fixed 2 releases
| Version | Status | Fixed in |
|---|---|---|
| 9 | Fixed | — |
| 8 | Fixed | — |
Rocky Linux Fixed 2 releases
| Version | Status | Fixed in |
|---|---|---|
| 9 | Fixed | — |
| 8 | Fixed | — |
References
- https://errata.rockylinux.org/RLSA-2023:6980
- https://access.redhat.com/errata/RHSA-2022:7967
- https://access.redhat.com/errata/RHSA-2023:6368
- https://www.suse.com/security/cve/CVE-2021-3750.html
- https://errata.rockylinux.org/RLSA-2022:7967
- https://security-tracker.debian.org/tracker/CVE-2021-3750
- https://access.redhat.com/errata/RHSA-2023:6980
- https://bugzilla.redhat.com/1999073
- https://bugzilla.redhat.com/2215784
- https://errata.almalinux.org/8/ALSA-2023-6980.html
- https://bugzilla.redhat.com/1951118
- https://bugzilla.redhat.com/1973784
- https://bugzilla.redhat.com/2035002
- https://errata.almalinux.org/9/ALSA-2022-7967.html
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.