CVE-2012-3516

Severity: medium (CVSS 6.9 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: 2012-11-23 · updated 2026-06-16
Weakness: CWE-264

Description

The GNTTABOP_swap_grant_ref sub-operation in the grant table hypercall in Xen 4.2 and Citrix XenServer 6.0.2 allows local guest kernels or administrators to cause a denial of service (host crash) and possibly gain privileges via a crafted grant reference that triggers a write to an arbitrary hypervisor memory location.

Affected products

Citrix XenServer: through 6.0.2
xen: 4.2.0

References

http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00004.html
http://secunia.com/advisories/50472
http://secunia.com/advisories/50530
http://support.citrix.com/article/CTX134708
http://wiki.xen.org/wiki/Security_Announcements#XSA-18_grant_table_entry_swaps_have_inadequate_bounds_checking
http://www.openwall.com/lists/oss-security/2012/09/05/11
http://www.securityfocus.com/bid/55411
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00004.html
http://secunia.com/advisories/50472
http://secunia.com/advisories/50530
http://support.citrix.com/article/CTX134708
http://wiki.xen.org/wiki/Security_Announcements#XSA-18_grant_table_entry_swaps_have_inadequate_bounds_checking

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