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…
- 4.9MediumCVSS base score
- 0.45%Exploitation in 30 daysEPSS · top 61% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By mitre
- 5 days later
· 5 days later
Published
- 9 years later
· 9 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
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 (10 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.9.
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)
- EUVD EUVD-2015-2846 (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)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2015-2756)Record last updated .