| Name | CVE-2015-2756 |
| Description | QEMU, as used in Xen 3.3.x through 4.5.x, does not properly restrict access to PCI command registers, which might allow local HVM guest users to cause a denial of service (non-maskable interrupt and host crash) by disabling the (1) memory or (2) I/O decoding for a PCI Express device and then accessing the device, which triggers an Unsupported Request (UR) response. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more) |
| References | DLA-479-1, DSA-3259-1 |
| NVD severity | medium (attack range: local) |
| Debian Bugs | 781620 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| qemu (PTS) | jessie (security), jessie | 1:2.1+dfsg-12+deb8u6 | fixed |
| stretch (security), stretch | 1:2.8+dfsg-6+deb9u4 | fixed | |
| buster, sid | 1:2.12+dfsg-3 | fixed | |
| xen (PTS) | jessie (security), jessie | 4.4.1-9+deb8u10 | fixed |
| buster, sid, stretch (security), stretch | 4.8.3+xsa267+shim4.10.1+xsa267-1+deb9u9 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| qemu | source | (unstable) | 1:2.3+dfsg-3 | medium | ||
| qemu | source | jessie | 1:2.1+dfsg-12 | medium | DSA-3259-1 | |
| qemu | source | squeeze | (not affected) | |||
| qemu | source | wheezy | (not affected) | |||
| qemu-kvm | source | (unstable) | (not affected) | |||
| xen | source | (unstable) | 4.2.0~rc2-1 | medium | 781620 | |
| xen | source | squeeze | (unfixed) | end-of-life | ||
| xen | source | wheezy | 4.1.6.1-1+deb7u1 | medium | DLA-479-1 |
[squeeze] - xen <end-of-life> (Not supported in Squeeze LTS)
[wheezy] - qemu <not-affected> (Vulnerable code not present)
[squeeze] - qemu <not-affected> (Vulnerable code not present)
- qemu-kvm <not-affected> (Vulnerable code not present)
http://xenbits.xen.org/xsa/advisory-126.html