CVE-2018-18883
published 2018-11-01CVE-2018-18883: An issue was discovered in Xen 4.9.x through 4.11.x, on Intel x86 platforms, allowing x86 HVM and PVH guests to cause a host OS denial of service (NULL pointer…
PriorityP434high8.8CVSS 3.0
AVLACLPRLUINSCCHIHAH
EPSS
0.44%
35.8th percentile
An issue was discovered in Xen 4.9.x through 4.11.x, on Intel x86 platforms, allowing x86 HVM and PVH guests to cause a host OS denial of service (NULL pointer dereference) or possibly have unspecified other impact because nested VT-x is not properly restricted.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | xen | < xen 4.11.1-1 (bookworm) | xen 4.11.1-1 (bookworm) |
| xen | xen | >= 0 < 4.11.1-1 | 4.11.1-1 |
| xen | xen | >= 0 < 4.11.1-1 | 4.11.1-1 |
| xen | xen | >= 0 < 4.11.1-1 | 4.11.1-1 |
| xen | xen | >= 0 < 4.11.1-1 | 4.11.1-1 |
| xen | xen | 4.9.0 – 4.11.0 | — |
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: Nested VT-x usable even when disabled
vendor_redhat·2018-10-24·CVSS 8.8
CVE-2018-18883 [HIGH] CWE-250 xen: Nested VT-x usable even when disabled
xen: Nested VT-x usable even when disabled
An issue was discovered in Xen 4.9.x through 4.11.x, on Intel x86 platforms, allowing x86 HVM and PVH guests to cause a host OS denial of service (NULL pointer dereference) or possibly have unspecified other impact because nested VT-x is not properly restricted.
Package: xen (Red Hat Enterprise Linux 5) - Not affected
Debian
CVE-2018-18883: xen - An issue was discovered in Xen 4.9.x through 4.11.x, on Intel x86 platforms, all...
vendor_debian·2018·CVSS 8.8
CVE-2018-18883 [HIGH] CVE-2018-18883: xen - An issue was discovered in Xen 4.9.x through 4.11.x, on Intel x86 platforms, all...
An issue was discovered in Xen 4.9.x through 4.11.x, on Intel x86 platforms, allowing x86 HVM and PVH guests to cause a host OS denial of service (NULL pointer dereference) or possibly have unspecified other impact because nested VT-x is not properly restricted.
Scope: local
bookworm: resolved (fixed in 4.11.1-1)
bullseye: resolved (fixed in 4.11.1-1)
forky: resolved (fixed in 4.11.1-1)
sid: resolved (fixed in 4.11.1-1)
trixie: resolved (fixed in 4.11.1-1)
GHSA
GHSA-7xx2-fw34-h693: An issue was discovered in Xen 4
ghsa_unreviewed·2022-05-14
CVE-2018-18883 [HIGH] CWE-476 GHSA-7xx2-fw34-h693: An issue was discovered in Xen 4
An issue was discovered in Xen 4.9.x through 4.11.x, on Intel x86 platforms, allowing x86 HVM and PVH guests to cause a host OS denial of service (NULL pointer dereference) or possibly have unspecified other impact because nested VT-x is not properly restricted.
OSV
CVE-2018-18883: An issue was discovered in Xen 4
osv·2018-11-01·CVSS 8.8
CVE-2018-18883 [HIGH] CVE-2018-18883: An issue was discovered in Xen 4
An issue was discovered in Xen 4.9.x through 4.11.x, on Intel x86 platforms, allowing x86 HVM and PVH guests to cause a host OS denial of service (NULL pointer dereference) or possibly have unspecified other impact because nested VT-x is not properly restricted.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2018-18883 xen: Nested VT-x usable even when disabled
bugzilla·2018-10-25·CVSS 8.8
CVE-2018-18883 [HIGH] CVE-2018-18883 xen: Nested VT-x usable even when disabled
CVE-2018-18883 xen: Nested VT-x usable even when disabled
When running HVM guests, virtual extensions are enabled in hardware because
Xen is using them. As a result, a guest can blindly execute the
virtualisation instructions, and will exit to Xen for processing.
In the case that the guest hasn't followed the correct (virtual) configuration
procedure, it shouldn't be able to use the instructions, and Xen should
respond with #UD exception. When nested virtualisation is disabled for the
guest, it is not permitted to complete the configuration procedure.
Unfortunately, when nested virtualisation is intended to be disabled for the
guest, an incorrect default value leads Xen to believe that the configuration
procedure has already been completed.
References:
https://seclists.org/oss-sec/201
Bugzilla
CVE-2018-18883 xen: Nested VT-x usable even when disabled [fedora-all]
bugzilla·2018-10-25·CVSS 8.8
CVE-2018-18883 [HIGH] CVE-2018-18883 xen: Nested VT-x usable even when disabled [fedora-all]
CVE-2018-18883 xen: Nested VT-x usable even when disabled [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-all.
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 changelog and the
fedpkg commit message.
NOTE: this issue affects multiple supported versions of Fed
2018-11-01
Published