CVE-2015-8555
Xen 4.6.x, 4.5.x, 4.4.x, 4.3.x, and earlier do not initialize x86 FPU stack and XMM registers when XSAVE/XRSTOR are not used to manage guest extended register state, which allows local guest domains to obtain sensitive information from other domains via…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.25%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Xen 4.6.x, 4.5.x, 4.4.x, 4.3.x, and earlier do not initialize x86 FPU stack and XMM registers when XSAVE/XRSTOR are not used to manage guest extended register state, which allows local guest domains to obtain sensitive information from other domains via unspecified vectors.
- CVSS 3.0
- 8.6 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
- EPSS
- 2.25% probability · 82th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-200
- Affected
- citrix/xenserver · xen/xen
- Source
- cve@mitre.org
References
- http://support.citrix.com/article/CTX203879
- http://www.debian.org/security/2016/dsa-3519
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- http://www.securityfocus.com/bid/79543
- http://www.securitytracker.com/id/1034477
- http://xenbits.xen.org/xsa/advisory-165.htmlPatch, Vendor Advisory
- https://security.gentoo.org/glsa/201604-03
- http://support.citrix.com/article/CTX203879
- http://www.debian.org/security/2016/dsa-3519
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- http://www.securityfocus.com/bid/79543
- http://www.securitytracker.com/id/1034477
- http://xenbits.xen.org/xsa/advisory-165.htmlPatch, Vendor Advisory
- https://security.gentoo.org/glsa/201604-03
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.