UBUNTU-CVE-2020-28368

Xen through 4.14.x allows guest OS administrators to obtain sensitive information such as AES keys from outside the guest via a side-channel attack on a power/energy monitoring interface, aka a "Platypus" attack. NOTE: there is only one logically independent fix: to change the access control for...

[SECURITY] Fedora 33 Update: xen-4.14.0-6.fc33

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

Fedora: Security Advisory for xen (FEDORA-2020-97775b4234)

The remote host is missing an update for the SPDX-FileCopyrightText: 2020 Greenbone AG 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-only ifdescription...

CVE-2020-27674

A flaw was found in the Xen hypercalls with INVLPG-like behavior used by x86 PV guests to invalidate TLB entries. This flaw allows a malicious unprivileged guest user to escalate their privileges to the kernel level within the guest. Mitigation There is no known mitigation for this flaw apart fro...

DEBIAN-CVE-2020-27673

An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. Guest OS users can cause a denial of service host OS hang via a high rate of events to dom0, aka CID-e99502f76271...

DEBIAN-CVE-2020-27675

An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. drivers/xen/events/eventsbase.c allows event-channel removal during the event-handling loop a race condition. This can cause a use-after-free or NULL pointer dereference, as demonstrated by a dom0 crash vi...

DEBIAN-CVE-2020-27674

An issue was discovered in Xen through 4.14.x allowing x86 PV guest OS users to gain guest OS privileges by modifying kernel memory contents, because invalidation of TLB entries is mishandled during use of an INVLPG-like attack technique...

UBUNTU-CVE-2020-27673

An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. Guest OS users can cause a denial of service host OS hang via a high rate of events to dom0, aka CID-e99502f76271...

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.

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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...

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...

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...

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 ...

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...