UBUNTU-CVE-2019-19578

An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via degenerate chains of linear pagetables, because of an incorrect fix for CVE-2017-15595. "Linear pagetables" is a technique which involves either pointing a pagetable at itself, or to...

CVE-2019-19580

An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to gain host OS privileges by leveraging race conditions in pagetable promotion and demotion operations, because of an incomplete fix for CVE-2019-18421. XSA-299 addressed several critical issues in restartable PV type...

Linear pagetable use / entry miscounts

ISSUE DESCRIPTION "Linear pagetables" is a technique which involves either pointing a pagetable at itself, or to another pagetable of the same or higher level. Xen has limited support for linear pagetables: A page may either point to itself, or point to another pagetable of the same level i.e., L...

VMX: VMentry failure with debug exceptions and blocked states

ISSUE DESCRIPTION Please see XSA-260 for background on the MovSS shadow: http://xenbits.xen.org/xsa/advisory-260.html Please see XSA-156 for background on the need for DB interception: http://xenbits.xen.org/xsa/advisory-156.html The VMX VMEntry checks does not like the exact combination of state...

microcode_ctl security update

2:2.1-53.3.0.4 - set earlymicrocode='no' in virtualized guests to avoid early load bugs Orabug: 30618736 2:2.1-53.3.0.1 - do not late load prior to 3.10.0 - ensure late loading fixes are present on 4.1.12- and 4.14.35- - enable early loading on 06-4f-01 - update 06-55-04 to 0x2000065 - update...

microcode_ctl security update

3:1.17-33.19.0.4 - set earlymicrocode='no' in virtualized guests to avoid early load bugs Orabug: 30618737 3:1.17-33.19.0.1 - merge Oracle changes for early load via dracut - enable late load on install for UEK4 kernels marked safe except BDW-79 - update 06-55-04 to 0x2000065 - update 06-55-07 to...

CVE-2019-6670

On BIG-IP 15.0.0-15.0.1, 14.1.0-14.1.2, 14.0.0-14.0.1, 13.1.0-13.1.3.1, 12.1.0-12.1.5, and 11.5.1-11.6.5, vCMP hypervisors are incorrectly exposing the plaintext unit key for their vCMP guests on the filesystem...

USN-4185-3: Linux kernel vulnerability and regression | Cloud Foundry

Severity High Vendor Canonical Ubuntu Versions Affected Canonical Ubuntu 16.04 Description USN-4185-1 fixed vulnerabilities in the Linux kernel. It was discovered that the kernel fix for CVE-2019-0155 i915 missing Blitter Command Streamer check was incomplete on 64-bit Intel x86 systems. Also, th...

Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerability and regression (USN-4185-3)

The remote Ubuntu 16.04 LTS / 18.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-4185-3 advisory. USN-4185-1 fixed vulnerabilities in the Linux kernel. It was discovered that the kernel fix for CVE-2019-0155 i915 missing Blitter Command Streamer...

Xen Project VCPUOP_initialise DoS (XSA-296)

According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by a denial of service vulnerability due to poor handling of an invalid format string in 'hypercallcreatecontinuation'. This function can be reached via a long-running 'VCPUOPinitialise'...

CVE-2019-18421

A flaw was found in xen. Several race conditions exist that, if triggered, can cause Xen to drop or retain extra type counts allowing guests to get write access to in-use pagetables. The highest threat from this vulnerability is to data confidentiality and integrity as well as to system...

DEBIAN-CVE-2019-18425

An issue was discovered in Xen through 4.12.x allowing 32-bit PV guest OS users to gain guest OS privileges by installing and using descriptors. There is missing descriptor table limit checking in x86 PV emulation. When emulating certain PV guest operations, descriptor table accesses are performe...

ALPINE-CVE-2019-18425

An issue was discovered in Xen through 4.12.x allowing 32-bit PV guest OS users to gain guest OS privileges by installing and using descriptors. There is missing descriptor table limit checking in x86 PV emulation. When emulating certain PV guest operations, descriptor table accesses are performe...

DEBIAN-CVE-2019-18421

An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to gain host OS privileges by leveraging race conditions in pagetable promotion and demotion operations. There are issues with restartable PV type change operations. To avoid using shadow pagetables for PV guests, Xen...

UBUNTU-CVE-2019-18421

An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to gain host OS privileges by leveraging race conditions in pagetable promotion and demotion operations. There are issues with restartable PV type change operations. To avoid using shadow pagetables for PV guests, Xen...

CVE-2019-18421

An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to gain host OS privileges by leveraging race conditions in pagetable promotion and demotion operations. There are issues with restartable PV type change operations. To avoid using shadow pagetables for PV guests, Xen...

UBUNTU-CVE-2019-18420

An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via a VCPUOPinitialise hypercall. hypercallcreatecontinuation is a variadic function which uses a printf-like format string to interpret its parameters. Error handling for a bad format...

VCPUOP_initialise DoS

ISSUE DESCRIPTION hypercallcreatecontinuation is a variadic function which uses a printf-like format string to interpret its parameters. Error handling for a bad format character was done using BUG, which crashes Xen. One path, via the VCPUOPinitialise hypercall, has a bad format character. The B...

PT-2019-4883 · Xen +1 · Xen +1

Name of the Vulnerable Software and Affected Versions: Xen versions through 4.12.x Description: The issue is related to a flaw in restartable PV type change operations, which can be exploited by a remote attacker to gain access to confidential data, compromise its integrity, and cause a denial of...

PT-2019-4882 · Xen +1 · Xen +1

Name of the Vulnerable Software and Affected Versions: Xen versions 4.6 through 4.12.x Description: The issue is related to incorrect error handling for a malformed format character in the hypercall initialise function of the Xen hypervisor. This can be exploited by a remote attacker to cause a...