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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Fedora Affected 2 releases
| Version | Status | Fixed in |
|---|---|---|
| 21 | Affected | — |
| 20 | Affected | — |
Ubuntu Affected 4 releases
| Version | Status | Fixed in |
|---|---|---|
| 15.04 | Affected | — |
| 14.10 | Affected | — |
| 14.04 | Affected | — |
| 12.04 | Affected | — |
Debian Mixed 7 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 1:2.3+dfsg-3 |
| sid | Fixed | 1:2.3+dfsg-3 |
| forky | Fixed | 1:2.3+dfsg-3 |
| bullseye | Fixed | 1:2.3+dfsg-3 |
| bookworm | Fixed | 1:2.3+dfsg-3 |
| 8.0 | Affected | — |
| 7.0 | Affected | — |
References
- http://lists.fedoraproject.org/pipermail/package-announce/2015-April/154574.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-April/154579.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155198.html
- http://lists.nongnu.org/archive/html/qemu-devel/2015-03/msg06179.html
- http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00014.html
- http://support.citrix.com/article/CTX201145
- http://www.debian.org/security/2015/dsa-3259
- http://www.securityfocus.com/bid/72577
- http://www.securitytracker.com/id/1031998
- http://www.ubuntu.com/usn/USN-2608-1
- http://xenbits.xen.org/xsa/advisory-126.html
- https://security.gentoo.org/glsa/201504-04
- https://support.citrix.com/article/CTX206006
- https://security-tracker.debian.org/tracker/CVE-2015-2756
CWEs
CWE-264
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.