CVE-2015-7970

Severity: medium (CVSS 4.9 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2015-10-30 · updated 2026-06-17
Weakness: CWE-399

Description

The p2m_pod_emergency_sweep function in arch/x86/mm/p2m-pod.c in Xen 3.4.x, 3.5.x, and 3.6.x is not preemptible, which allows local x86 HVM guest administrators to cause a denial of service (CPU consumption and possibly reboot) via crafted memory contents that triggers a "time-consuming linear scan," related to Populate-on-Demand.

Affected products

xen: 3.4.0, 3.4.1, 3.4.2, 3.4.3, 3.4.4

References

http://lists.fedoraproject.org/pipermail/package-announce/2015-November/171082.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-November/171185.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-November/171249.html
http://lists.opensuse.org/opensuse-updates/2015-12/msg00053.html
http://support.citrix.com/article/CTX202404
http://www.debian.org/security/2015/dsa-3414
http://www.securityfocus.com/bid/77362
http://www.securitytracker.com/id/1034034
http://xenbits.xen.org/xsa/advisory-150.html
https://security.gentoo.org/glsa/201604-03
http://lists.fedoraproject.org/pipermail/package-announce/2015-November/171082.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-November/171185.html

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