CVE-2016-9383
published 2017-01-23CVE-2016-9383: Xen, when running on a 64-bit hypervisor, allows local x86 guest OS users to modify arbitrary memory and consequently obtain sensitive information, cause a…
PriorityP337high8.8CVSS 3.0
AVLACLPRLUINSCCHIHAH
EPSS
0.51%
42.2th percentile
Xen, when running on a 64-bit hypervisor, allows local x86 guest OS users to modify arbitrary memory and consequently obtain sensitive information, cause a denial of service (host crash), or execute arbitrary code on the host by leveraging broken emulation of bit test instructions.
Affected
16 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| citrix | citrix_adm | — | — |
| citrix | citrix_hypervisor | — | — |
| citrix | citrix_virtual_apps_and_desktops | — | — |
| citrix | endpoint_management | — | — |
| citrix | netscaler_adc | — | — |
| citrix | netscaler_gateway | — | — |
| citrix | xenserver | — | — |
| citrix | xenserver | — | — |
| citrix | xenserver | — | — |
| citrix | xenserver | — | — |
| citrix | xenserver | — | — |
| debian | xen | < xen 4.8.0-1 (bookworm) | xen 4.8.0-1 (bookworm) |
| xen | xen | >= 0 < 4.8.0-1 | 4.8.0-1 |
| xen | xen | >= 0 < 4.8.0-1 | 4.8.0-1 |
| xen | xen | >= 0 < 4.8.0-1 | 4.8.0-1 |
| xen | xen | >= 0 < 4.8.0-1 | 4.8.0-1 |
CVSS provenance
nvdv3.08.8HIGHCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
nvdv2.07.2HIGHAV:L/AC:L/Au:N/C:C/I:C/A:C
osv8.8HIGH
vendor_debian8.8HIGH
vendor_redhat8.8HIGH
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Red Hat
xen: x86 64-bit bit test instruction emulation broken (XSA-195)
vendor_redhat·2016-11-22·CVSS 8.8
CVE-2016-9383 [HIGH] xen: x86 64-bit bit test instruction emulation broken (XSA-195)
xen: x86 64-bit bit test instruction emulation broken (XSA-195)
Xen, when running on a 64-bit hypervisor, allows local x86 guest OS users to modify arbitrary memory and consequently obtain sensitive information, cause a denial of service (host crash), or execute arbitrary code on the host by leveraging broken emulation of bit test instructions.
Package: xen (Red Hat Enterprise Linux 5) - Will not fix
Debian
CVE-2016-9383: xen - Xen, when running on a 64-bit hypervisor, allows local x86 guest OS users to mod...
vendor_debian·2016·CVSS 8.8
CVE-2016-9383 [HIGH] CVE-2016-9383: xen - Xen, when running on a 64-bit hypervisor, allows local x86 guest OS users to mod...
Xen, when running on a 64-bit hypervisor, allows local x86 guest OS users to modify arbitrary memory and consequently obtain sensitive information, cause a denial of service (host crash), or execute arbitrary code on the host by leveraging broken emulation of bit test instructions.
Scope: local
bookworm: resolved (fixed in 4.8.0-1)
bullseye: resolved (fixed in 4.8.0-1)
forky: resolved (fixed in 4.8.0-1)
sid: resolved (fixed in 4.8.0-1)
trixie: resolved (fixed in 4.8.0-1)
Citrix
Citrix Security Bulletin CTX218775
vendor_citrix·CVSS 7.9
CVE-2016-9379 [HIGH] Citrix Security Bulletin CTX218775
Citrix Security Bulletin CTX218775
CVE References: CVE-2016-9379, CVE-2016-9380, CVE-2016-9381, CVE-2016-9382, CVE-2016-9383, CVE-2016-9385, CVE-2016-9386, CVE-2025-12101, CVE-2025-62626, CVE-2026-23554, CVE-2026-3055, CVE-2026-4368, CVE-2026-4397
Affected Products: Citrix ADM, Citrix Hypervisor, Citrix Virtual Apps and Desktops, Endpoint Management, NetScaler ADC, NetScaler Gateway, XenServer
GHSA
GHSA-qw22-r72h-rf56: Xen, when running on a 64-bit hypervisor, allows local x86 guest OS users to modify arbitrary memory and consequently obtain sensitive information, ca
ghsa_unreviewed·2022-05-17
CVE-2016-9383 [HIGH] CWE-20 GHSA-qw22-r72h-rf56: Xen, when running on a 64-bit hypervisor, allows local x86 guest OS users to modify arbitrary memory and consequently obtain sensitive information, ca
Xen, when running on a 64-bit hypervisor, allows local x86 guest OS users to modify arbitrary memory and consequently obtain sensitive information, cause a denial of service (host crash), or execute arbitrary code on the host by leveraging broken emulation of bit test instructions.
OSV
CVE-2016-9383: Xen, when running on a 64-bit hypervisor, allows local x86 guest OS users to modify arbitrary memory and consequently obtain sensitive information, ca
osv·2017-01-23·CVSS 8.8
CVE-2016-9383 [HIGH] CVE-2016-9383: Xen, when running on a 64-bit hypervisor, allows local x86 guest OS users to modify arbitrary memory and consequently obtain sensitive information, ca
Xen, when running on a 64-bit hypervisor, allows local x86 guest OS users to modify arbitrary memory and consequently obtain sensitive information, cause a denial of service (host crash), or execute arbitrary code on the host by leveraging broken emulation of bit test instructions.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2016-9377 CVE-2016-9378 CVE-2016-9379 CVE-2016-9380 CVE-2016-9381 CVE-2016-9382 CVE-2016-9383 CVE-2016-9384 CVE-2016-9385 CVE-2016-9386 xen: various flaws [fedora-all]
bugzilla·2016-11-22·CVSS 5.5
CVE-2016-9377 [MEDIUM] CVE-2016-9377 CVE-2016-9378 CVE-2016-9379 CVE-2016-9380 CVE-2016-9381 CVE-2016-9382 CVE-2016-9383 CVE-2016-9384 CVE-2016-9385 CVE-2016-9386 xen: various flaws [fedora-all]
CVE-2016-9377 CVE-2016-9378 CVE-2016-9379 CVE-2016-9380 CVE-2016-9381 CVE-2016-9382 CVE-2016-9383 CVE-2016-9384 CVE-2016-9385 CVE-2016-9386 xen: various flaws [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of Fedora.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM chan
Bugzilla
CVE-2016-9383 xsa195 xen: x86 64-bit bit test instruction emulation broken (XSA-195)
bugzilla·2016-11-08·CVSS 8.8
CVE-2016-9383 [HIGH] CVE-2016-9383 xsa195 xen: x86 64-bit bit test instruction emulation broken (XSA-195)
CVE-2016-9383 xsa195 xen: x86 64-bit bit test instruction emulation broken (XSA-195)
ISSUE DESCRIPTION
The x86 instructions BT, BTC, BTR, and BTS, when used with a
destination memory operand and a source register rather than an
immediate operand, access a memory location offset from that specified
by the memory operand as specified by the high bits of the register
source.
When Xen needs to emulate such an instruction, to efficiently handle
the emulation, the memory address and register operand are
recalculated internally to Xen. In this process, the high bits of an
intermediate expression were discarded, leading to both the memory
location and the register operand being wrong.
The wrong memory location would have only a guest local effect (either
access to an unintended location, or a
http://www.securityfocus.com/bid/94474http://www.securitytracker.com/id/1037346http://xenbits.xen.org/xsa/advisory-195.htmlhttps://security.gentoo.org/glsa/201612-56https://support.citrix.com/article/CTX218775http://www.securityfocus.com/bid/94474http://www.securitytracker.com/id/1037346http://xenbits.xen.org/xsa/advisory-195.htmlhttps://security.gentoo.org/glsa/201612-56https://support.citrix.com/article/CTX218775
2017-01-23
Published