CVE-2021-3527
Publication date 26 May 2021
Last updated 24 July 2024
Ubuntu priority
Cvss 3 Severity Score
A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a single, large transfer request, to reduce the overhead and improve performance. The combined size of the bulk transfer is used to dynamically allocate a variable length array (VLA) on the stack without proper validation. Since the total size is not bounded, a malicious guest could use this flaw to influence the array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a denial of service.
Status
Package | Ubuntu Release | Status |
---|---|---|
qemu | 24.10 oracular |
Fixed 1:6.0+dfsg-2expubuntu1
|
24.04 LTS noble |
Fixed 1:6.0+dfsg-2expubuntu1
|
|
22.04 LTS jammy |
Fixed 1:6.0+dfsg-2expubuntu1
|
|
20.04 LTS focal |
Fixed 1:4.2-3ubuntu6.17
|
|
18.04 LTS bionic |
Fixed 1:2.11+dfsg-1ubuntu7.37
|
|
16.04 LTS xenial |
Vulnerable
|
|
14.04 LTS trusty |
Vulnerable
|
|
qemu-kvm | 24.10 oracular | 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 | 5.5 · Medium |
Attack vector | Local |
Attack complexity | Low |
Privileges required | Low |
User interaction | None |
Scope | Unchanged |
Confidentiality | None |
Integrity impact | None |
Availability impact | High |
Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-5010-1
- QEMU vulnerabilities
- 15 July 2021