CVE-2020-25723
Publication date 18 November 2020
Last updated 18 August 2025
Ubuntu priority
Description
A reachable assertion issue was found in the USB EHCI emulation code of QEMU. It could occur while processing USB requests due to missing handling of DMA memory map failure. A malicious privileged user within the guest may abuse this flaw to send bogus USB requests and crash the QEMU process on the host, resulting in a denial of service.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| qemu | 25.10 questing |
Fixed 1:5.2+dfsg-2ubuntu1
|
| 25.04 plucky |
Fixed 1:5.2+dfsg-2ubuntu1
|
|
| 24.04 LTS noble |
Fixed 1:5.2+dfsg-2ubuntu1
|
|
| 22.04 LTS jammy |
Fixed 1:5.2+dfsg-2ubuntu1
|
|
| 20.04 LTS focal |
Fixed 1:4.2-3ubuntu6.10
|
|
| 18.04 LTS bionic |
Fixed 1:2.11+dfsg-1ubuntu7.34
|
|
| 16.04 LTS xenial |
Fixed 1:2.5+dfsg-5ubuntu10.48
|
|
| 14.04 LTS trusty |
Vulnerable
|
|
| qemu-kvm | 25.10 questing | Not in release |
| 25.04 plucky | Not in release | |
| 24.04 LTS noble | Not in release | |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Not in release | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release |
Patch details
| Package | Patch details |
|---|---|
| qemu |
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
3.2 · Low
|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | High |
| User interaction | None |
| Scope | Changed |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | Low |
| Vector | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L |
References
Related Ubuntu Security Notices (USN)
- USN-4650-1
- QEMU vulnerabilities
- 30 November 2020