CVE-2015-7835

Severity: high (CVSS 7.2 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-20

Description

The mod_l2_entry function in arch/x86/mm.c in Xen 3.4 through 4.6.x does not properly validate level 2 page table entries, which allows local PV guest administrators to gain privileges via a crafted superpage mapping.

Affected products

xen: 3.4.0, 3.4.1, 3.4.2, 3.4.3, 3.4.4, 4.0.0 (+24)

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/2015-11/msg00063.html
http://lists.opensuse.org/opensuse-updates/2015-12/msg00053.html
http://support.citrix.com/article/CTX202404
http://www.debian.org/security/2015/dsa-3390
http://www.securityfocus.com/bid/77366
http://www.securitytracker.com/id/1034032
http://xenbits.xen.org/xsa/advisory-148.html
https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-022-2015.txt
https://security.gentoo.org/glsa/201604-03

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