x86 HVM hypercalls may trigger Xen bug check

ISSUE DESCRIPTION Unlike 32-bit PV guests, HVM guests may switch freely between 64-bit and other modes. This in particular means that they may set registers used to pass 32-bit-mode hypercall arguments to values outside of the range 32-bit code would be able to set them to. When processing of...

PT-2024-6307 · Xen +3 · Xen +3

Name of the Vulnerable Software and Affected Versions: Xen affected versions not specified Description: The issue is related to the x86 HVM hypercall handler in the Xen hypervisor. HVM guests can switch freely between 64-bit and other modes, allowing them to set registers used to pass 32-bit-mode...

CVE-2023-46840

Incorrect placement of a preprocessor directive in source code results in logic that doesn't operate as intended when support for HVM guests is compiled out of Xen...

CVE-2023-46840

Incorrect placement of a preprocessor directive in source code results in logic that doesn't operate as intended when support for HVM guests is compiled out of Xen...

CVE-2023-46840

Incorrect placement of a preprocessor directive in source code results in logic that doesn't operate as intended when support for HVM guests is compiled out of Xen...

CVE-2023-46840

CVE-2023-46840 concerns Xen where an incorrect placement of a preprocessor directive in Xen source leads to logic that does not operate as intended when HVM guest support is compiled out. The vulnerability is described across multiple connected advisories (e.g., Nessus/OPENVAS entries and OSV/nvd...

CVE-2023-46840 VT-d: Failure to quarantine devices in !HVM builds

Incorrect placement of a preprocessor directive in source code results in logic that doesn't operate as intended when support for HVM guests is compiled out of Xen...

CVE-2023-46840

Incorrect placement of a preprocessor directive in source code results in logic that doesn't operate as intended when support for HVM guests is compiled out of Xen...

CVE-2023-46840 VT-d: Failure to quarantine devices in !HVM builds

Incorrect placement of a preprocessor directive in source code results in logic that doesn't operate as intended when support for HVM guests is compiled out of Xen...

SUSE SLED15: xen / xen-devel / xen-doc-html / xen-libs / xen-libs-32bit / etc (SUSE-SU-2024:0830-1)

The remote SUSE Linux SLED15 / SLEDSAP15 / SLES15 / SLESSAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2024:0830-1 advisory. - CVE-2023-46839: Fixed memory access through PCI device with phantom functions XSA-449...

x86: shadow stack vs exceptions from emulation stubs

ISSUE DESCRIPTION Recent x86 CPUs offer functionality named Control-flow Enforcement Technology CET. A sub-feature of this are Shadow Stacks CET-SS. CET-SS is a hardware feature designed to protect against Return Oriented Programming attacks. When enabled, traditional stacks holding both data and...

SUSE CVE-2023-46840

Incorrect placement of a preprocessor directive in source code results in logic that doesn't operate as intended when support for HVM guests is compiled out of Xen...

SUSE-SU-2024:0266-1 Security update for xen

This update for xen fixes the following issues: - CVE-2023-46839: Fixed phantom functions assigned to incorrect contexts XSA-449 bsc1218851 - CVE-2023-46840: Fixed VT-d: Failure to quarantine devices in !HVM builds XSA-450 bsc1219080...

VT-d: Failure to quarantine devices in !HVM builds

ISSUE DESCRIPTION Incorrect placement of a preprocessor directive in source code results in logic that doesn't operate as intended when support for HVM guests is compiled out of Xen. IMPACT When a device is removed from a domain, it is not properly quarantined and retains its access to the domain...

CVE-2023-34328

This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE. AMD CPUs since 2014 have extensions to normal x86 debugging functionality. Xen supports guests using these extensions. Unfortunately there are errors in Xen's handling of...

UBUNTU-CVE-2023-34328

This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE. AMD CPUs since 2014 have extensions to normal x86 debugging functionality. Xen supports guests using these extensions. Unfortunately there are errors in Xen's handling of...

SUSE SLES15: xen / xen-devel / xen-libs / xen-tools / xen-tools-domU / etc (SUSE-SU-2023:4183-1)

The remote SUSE Linux SLES15 / SLESSAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2023:4183-1 advisory. - CVE-2023-34323: Fixed a potential crash in C Xenstored due to an incorrect assertion XSA-440 bsc1215744. - CVE-2023-34326: Fixed ...

Xen: x86/AMD: Debug Mask handling (XSA-444)

AMD CPUs since 2014 have extensions to normal x86 debugging functionality. Xen supports guests using these extensions. Unfortunately there are errors in Xen's handling of the guest state, leading to denials of service. - CVE-2023-34327 - An HVM vCPU can end up operating in the context of a previo...

x86/AMD: Debug Mask handling

ISSUE DESCRIPTION AMD CPUs since 2014 have extensions to normal x86 debugging functionality. Xen supports guests using these extensions. Unfortunately there are errors in Xen's handling of the guest state, leading to denials of service. 1 CVE-2023-34327 - An HVM vCPU can end up operating in the...

Mishandling of guest SSBD selection on AMD hardware

ISSUE DESCRIPTION The current logic to set SSBD on AMD Family 17h and Hygon Family 18h processors requires that the setting of SSBD is coordinated at a core level, as the setting is shared between threads. Logic was introduced to keep track of how many threads require SSBD active in order to...