| 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, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-479-1, DSA-3259-1 |
| Debian Bugs | 781620 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| qemu (PTS) | bullseye | 1:5.2+dfsg-11+deb11u3 | fixed |
| bullseye (security) | 1:5.2+dfsg-11+deb11u4 | fixed |
| bookworm | 1:7.2+dfsg-7+deb12u13 | fixed |
| trixie, sid | 1:10.0.2+ds-1 | fixed |
| xen (PTS) | bullseye | 4.14.6-1 | fixed |
| bullseye (security) | 4.14.5+94-ge49571868d-1 | fixed |
| bookworm | 4.17.5+23-ga4e5191dc0-1+deb12u1 | fixed |
| bookworm (security) | 4.17.5+23-ga4e5191dc0-1 | fixed |
| trixie, sid | 4.20.0+68-g35cb38b222-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| qemu | source | squeeze | (not affected) | | | |
| qemu | source | wheezy | (not affected) | | | |
| qemu | source | jessie | 1:2.1+dfsg-12 | | DSA-3259-1 | |
| qemu | source | (unstable) | 1:2.3+dfsg-3 | | | |
| qemu-kvm | source | (unstable) | (not affected) | | | |
| xen | source | squeeze | (unfixed) | end-of-life | | |
| xen | source | wheezy | 4.1.6.1-1+deb7u1 | | DLA-479-1 | |
| xen | source | (unstable) | 4.2.0~rc2-1 | | | 781620 |
Notes
[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