CVE-2016-5403

Publication date 2 August 2016

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

5.5 · Medium

Score breakdown

Description

The virtqueue_pop function in hw/virtio/virtio.c in QEMU allows local guest OS administrators to cause a denial of service (memory consumption and QEMU process crash) by submitting requests without waiting for completion.

Read the notes from the security team

Status

Package Ubuntu Release Status
qemu 16.10 yakkety
Fixed 1:2.6.1+dfsg-0ubuntu5.1
16.04 LTS xenial
Fixed 1:2.5+dfsg-5ubuntu10.6
15.10 wily Ignored end of life
14.04 LTS trusty
Fixed 2.0.0+dfsg-2ubuntu1.30
12.04 LTS precise Not in release
qemu-kvm 16.10 yakkety Not in release
16.04 LTS xenial Not in release
15.10 wily Not in release
14.04 LTS trusty Not in release
12.04 LTS precise
Fixed 1.0+noroms-0ubuntu14.31
xen 16.10 yakkety
Not affected
16.04 LTS xenial
Not affected
15.10 wily Ignored end of life
14.04 LTS trusty
Fixed 4.4.2-0ubuntu0.14.04.7
12.04 LTS precise
Fixed 4.1.6.1-0ubuntu0.12.04.12

Notes

mdeslaur

the patch for this CVE introduced a regression and was later reverted pending investigation. See LP: #1612089. proposed regression fixes: http://lists.nongnu.org/archive/html/qemu-devel/2016-08/msg01038.html http://lists.nongnu.org/archive/html/qemu-devel/2016-08/msg02666.html

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

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)

Other references