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  • CPE Product Version: cpe:/a:citrix:xenserver:7.2
There are 5 matching records.
Displaying matches 1 through 5.
Vuln ID Summary CVSS Severity
CVE-2018-8897

A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures Software Developer's Manual (SDM) was mishandled in the development of some or all operating-system kernels, resulting in unexpected behavior for #DB exceptions that are deferred by MOV SS or POP SS, as demonstrated by (for example) privilege escalation in Windows, macOS, some Xen configurations, or FreeBSD, or a Linux kernel crash. The MOV to SS and POP SS instructions inhibit interrupts (including NMIs), data breakpoints, and single step trap exceptions until the instruction boundary following the next instruction (SDM Vol. 3A; section 6.8.3). (The inhibited data breakpoints are those on memory accessed by the MOV to SS or POP to SS instruction itself.) Note that debug exceptions are not inhibited by the interrupt enable (EFLAGS.IF) system flag (SDM Vol. 3A; section 2.3). If the instruction following the MOV to SS or POP to SS instruction is an instruction like SYSCALL, SYSENTER, INT 3, etc. that transfers control to the operating system at CPL < 3, the debug exception is delivered after the transfer to CPL < 3 is complete. OS kernels may not expect this order of events and may therefore experience unexpected behavior when it occurs.

Published: May 08, 2018; 2:29:00 PM -0400
V3.0: 7.8 HIGH
V2.0: 7.2 HIGH
CVE-2017-12137

arch/x86/mm.c in Xen allows local PV guest OS users to gain host OS privileges via vectors related to map_grant_ref.

Published: August 24, 2017; 10:29:00 AM -0400
V3.0: 8.8 HIGH
V2.0: 7.2 HIGH
CVE-2017-12136

Race condition in the grant table code in Xen 4.6.x through 4.9.x allows local guest OS administrators to cause a denial of service (free list corruption and host crash) or gain privileges on the host via vectors involving maptrack free list handling.

Published: August 24, 2017; 10:29:00 AM -0400
V3.0: 7.8 HIGH
V2.0: 6.9 MEDIUM
CVE-2017-12135

Xen allows local OS guest users to cause a denial of service (crash) or possibly obtain sensitive information or gain privileges via vectors involving transitive grants.

Published: August 24, 2017; 10:29:00 AM -0400
V3.0: 8.8 HIGH
V2.0: 4.6 MEDIUM
CVE-2017-12134

The xen_biovec_phys_mergeable function in drivers/xen/biomerge.c in Xen might allow local OS guest users to corrupt block device data streams and consequently obtain sensitive memory information, cause a denial of service, or gain host OS privileges by leveraging incorrect block IO merge-ability calculation.

Published: August 24, 2017; 10:29:00 AM -0400
V3.0: 8.8 HIGH
V2.0: 7.2 HIGH