PT-2020-4727 · Linux +5 · Linux Kernel +5

Name of the Vulnerable Software and Affected Versions: Linux kernel versions up to 5.9.1 Xen versions up to 4.14.x Description: An issue in the Linux kernel allows guest OS users to cause a denial of service, resulting in a host OS hang, by sending a high rate of events to dom0. This issue is...

Xen evtchn_reset() race conditions privelege escalation (XSA-339)

A privilege escalation vulnerability exists in EVTCHNOPreset potentially by a guest on itself or XENDOMCTLsoftreset due to a race condition present in evtchnreset. An authenticated, local attacker can exploit this, via a violation of various internal assumptions, to gain elevate their privilege t...

Xen x86 PV guest kernels DoS (XSA-339)

A denial of service DoS vulnerability exists in Xen servers when using x86 PV guest kernels due to a mishandling of SYSENTER state sanitization activities. An authenticated, local attacker can exploit this issue, via the SYSENTER instruction in 64bit mode, to cause a VM Denial of Service. Note th...

Fedora: Security Advisory for xen (FEDORA-2020-d46fe34349)

The remote host is missing an update for the Copyright C 2020 Greenbone Networks GmbH Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-or-later This program is free software; you can...

[SECURITY] Fedora 31 Update: xen-4.12.3-5.fc31

This package contains the XenD daemon and xm command line tools, needed to manage virtual machines running under the Xen hypervisor...

[SECURITY] Fedora 33 Update: xen-4.14.0-5.fc33

This package contains the XenD daemon and xm command line tools, needed to manage virtual machines running under the Xen hypervisor...

Xen in the Linux kernel when running a guest on a host without hardware assisted paging (HAP) allows guest users to cause a denial of service (invalid pointer dereference and hypervisor crash) via the SAHF instruction.

...

DEBIAN-CVE-2020-25600

An issue was discovered in Xen through 4.14.x. Out of bounds event channels are available to 32-bit x86 domains. The so called 2-level event channel model imposes different limits on the number of usable event channels for 32-bit x86 domains vs 64-bit or Arm either bitness ones. 32-bit x86 domain...

ALPINE-CVE-2020-25604

An issue was discovered in Xen through 4.14.x. There is a race condition when migrating timers between x86 HVM vCPUs. When migrating timers of x86 HVM guests between its vCPUs, the locking model used allows for a second vCPU of the same guest also operating on the timers to release a lock that it...

UBUNTU-CVE-2020-25599

An issue was discovered in Xen through 4.14.x. There are evtchnreset race conditions. Uses of EVTCHNOPreset potentially by a guest on itself or XENDOMCTLsoftreset by itself covered by XSA-77 can lead to the violation of various internal assumptions. This may lead to out of bounds memory accesses ...

UBUNTU-CVE-2020-25604

An issue was discovered in Xen through 4.14.x. There is a race condition when migrating timers between x86 HVM vCPUs. When migrating timers of x86 HVM guests between its vCPUs, the locking model used allows for a second vCPU of the same guest also operating on the timers to release a lock that it...

Vulnerabilities fixed in Xen

Xen developers have fixed vulnerabilities in the hypervisor. The vulnerability with reference CVE-2020-25604 makes it possible for a local malicious person who can migrate timers between vCPU-s to cause a denial-of-service. The vulnerability with attribute CVE-2020-25595 allows a local malicious...

[SECURITY] Fedora 32 Update: xen-4.13.1-5.fc32

This package contains the XenD daemon and xm command line tools, needed to manage virtual machines running under the Xen hypervisor...

[SECURITY] Fedora 31 Update: xen-4.12.3-4.fc31

This package contains the XenD daemon and xm command line tools, needed to manage virtual machines running under the Xen hypervisor...

[SECURITY] Fedora 31 Update: xen-4.12.3-3.fc31

This package contains the XenD daemon and xm command line tools, needed to manage virtual machines running under the Xen hypervisor...

UBUNTU-CVE-2020-15852

An issue was discovered in the Linux kernel 5.5 through 5.7.9, as used in Xen through 4.13.x for x86 PV guests. An attacker may be granted the I/O port permissions of an unrelated task. This occurs because tssinvalidateiobitmap mishandling causes a loss of synchronization between the I/O bitmaps ...

[SECURITY] Fedora 32 Update: xen-4.13.1-4.fc32

This package contains the XenD daemon and xm command line tools, needed to manage virtual machines running under the Xen hypervisor...

Xen Input Validation Error Vulnerability (CNVD-2021-17751)

Xen is an open source virtual machine monitor product. It enables different and incompatible operating systems to run on the same computer and supports runtime migration to ensure uptime and avoid downtime. A security vulnerability exists in Xen 4.13.x and earlier versions. An attacker could...

ALPINE-CVE-2020-15566

An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a host OS crash because of incorrect error handling in event-channel port allocation. The allocation of an event-channel port may fail for multiple reasons: 1 port is already in use, 2 the memory allocation failed, or...

UBUNTU-CVE-2020-15565

An issue was discovered in Xen through 4.13.x, allowing x86 Intel HVM guest OS users to cause a host OS denial of service or possibly gain privileges because of insufficient cache write-back under VT-d. When page tables are shared between IOMMU and CPU, changes to them require flushing of both...