CVE-2021-3527
Published: 26 May 2021
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.
Priority
Status
Package | Release | Status |
---|---|---|
qemu Launchpad, Ubuntu, Debian |
bionic |
Released
(1:2.11+dfsg-1ubuntu7.37)
|
focal |
Released
(1:4.2-3ubuntu6.17)
|
|
groovy |
Released
(1:5.0-5ubuntu9.9)
|
|
hirsute |
Released
(1:5.2+dfsg-9ubuntu3.1)
|
|
impish |
Released
(1:6.0+dfsg-2expubuntu1)
|
|
jammy |
Released
(1:6.0+dfsg-2expubuntu1)
|
|
kinetic |
Released
(1:6.0+dfsg-2expubuntu1)
|
|
lunar |
Released
(1:6.0+dfsg-2expubuntu1)
|
|
trusty |
Needed
|
|
upstream |
Needs triage
|
|
xenial |
Needed
|
|
Patches: upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=7ec54f9eb62b5d177e30eb8b1cad795a5f8d8986 upstream: https://git.qemu.org/?p=qemu.git;a=commit;h=05a40b172e4d691371534828078be47e7fff524c |
||
qemu-kvm Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
focal |
Does not exist
|
|
groovy |
Does not exist
|
|
hirsute |
Does not exist
|
|
impish |
Does not exist
|
|
jammy |
Does not exist
|
|
kinetic |
Does not exist
|
|
lunar |
Does not exist
|
|
trusty |
Does not exist
|
|
upstream |
Needs triage
|
|
xenial |
Does not exist
|
Severity score breakdown
Parameter | Value |
---|---|
Base score | 5.5 |
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
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3527
- https://lists.nongnu.org/archive/html/qemu-devel/2021-05/msg00564.html
- https://lists.nongnu.org/archive/html/qemu-devel/2021-05/msg01372.html
- https://lists.nongnu.org/archive/html/qemu-devel/2021-05/msg01373.html
- https://ubuntu.com/security/notices/USN-5010-1
- NVD
- Launchpad
- Debian