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CVE-2015-2756
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…
Medium4.9EPSS 0.45%
- Published
- Updated
- Reserved
- Assigned by
- mitre
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Medium4.9 | AV:L/AC:L/Au:N/C:N/I:N/A:C |
- EPSS (exploitation in 30 days)
- 0.45% · top 61% of all CVEs (4 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.9.
Weakness
Affected products
n/a
- affected n/a
References (13)
- 72577 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- GLSA-201504-04 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- https://support.citrix.com/article/CTX206006 (opens in a new tab)x_refsource_CONFIRMx_transferred
- DSA-3259 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- FEDORA-2015-5295 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- FEDORA-2015-5208 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- http://support.citrix.com/article/CTX201145 (opens in a new tab)x_refsource_CONFIRMx_transferred
- [Qemu-devel] 20150331 [PATCH][XSA-126] xen: limit guest control of PCI command register (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- http://xenbits.xen.org/xsa/advisory-126.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- openSUSE-SU-2015:0732 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- USN-2608-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- 1031998 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- FEDORA-2015-5402 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2015-2756)Record last updated .