CVE-2016-7777 — Race Condition in XEN

CWE-362 — Race Condition8 documents6 sources
Severity
6.3MEDIUMNVD
EPSS
0.1%
top 68.76%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
XENDebian XEN
Timeline
PublishedOct 7
Latest updateMay 17

Description

Xen 4.7.x and earlier does not properly honor CR0.TS and CR0.EM, which allows local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it.

CVSS vector

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:NExploitability: 1.0 | Impact: 5.2

Affected Packages3 packages

▶debiandebian/xen< xen 4.8.0~rc3-1 (bookworm)
▶Debianxen/xen< 4.8.0~rc3-1+3
▶NVDxen/xen4.7.0

Patches

Patch: xenbits.xen.org ↗Patch: xenbits.xen.org ↗

🔴Vulnerability Details

2
GHSA
GHSA-cr4c-368c-2fc2: Xen 4↗2022-05-17
▶
OSV
CVE-2016-7777: Xen 4↗2016-10-07
▶

📋Vendor Advisories

2
Red Hat
xen: CR0.TS and CR0.EM not always honored for x86 HVM guests (XSA-190)↗2016-10-04
▶
Debian
CVE-2016-7777: xen - Xen 4.7.x and earlier does not properly honor CR0.TS and CR0.EM, which allows lo...↗2016
▶

💬Community

2
Bugzilla
CVE-2016-7777 xsa190 xen: CR0.TS and CR0.EM not always honored for x86 HVM guests (XSA-190) [fedora-all]↗2016-10-04
▶
Bugzilla
CVE-2016-7777 xsa190 xen: CR0.TS and CR0.EM not always honored for x86 HVM guests (XSA-190)↗2016-09-20
▶