Xen PCI Passthrough Code Reading Back Hardware Registers DoS (XSA-337)

According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by a denial of service DoS vulnerability. Code paths in Xen's MSI handling have been identified which act on unsanitized values read back from device hardware registers. While devices strict...

Denial Of Service (DoS)

xen is vulnerable to denial of service DoS. There are missing memory barriers when accessing/allocating an event channel. Event channels control structures can be accessed lockless as long as the port is considered to be valid. Such a sequence is missing an appropriate memory barrier e.g., smpmb ...

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...

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-2020-25604

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-2020-25604

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 ...

Privilege escalation

An issue was discovered in Xen through 4.14.x. There are missing memory barriers when accessing/allocating an event channel. Event channels control structures can be accessed lockless as long as the port is considered to be valid. Such a sequence is missing an appropriate memory barrier e.g., smp...

CVE-2020-25603

CVE-2020-25603 affects Xen up to 4.14.x, where missing memory barriers in event-channel access/allocation allow lockless manipulation of event-channel state. A malicious guest could crash the hypervisor, causing a Denial of Service, with potential information leaks or privilege escalation. Public...

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...

CVE-2020-25604

CVE-2020-25604 in Xen up to 4.14.x describes a race condition when migrating timers between x86 HVM vCPUs. The locking model can allow a second vCPU of the same guest to release a lock it did not acquire, potentially causing a hang or crash (DoS) of the hypervisor. Affected: all Xen versions on x...

Citrix Hypervisor Security Update

Description of Problem Several security issues have been identified in Citrix Hypervisor formerly Citrix XenServer that may allow privileged code in a guest VM to cause the host to crash or become unresponsive. In addition, unprivileged code in a PV guest VM may be able to cause that guest VM to...

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...

CVE-2020-25604

A race condition flaw was found in Xen. When migrating timers of x86 HVM guests between its vCPUs, the locking model that is used allows for a second vCPU of the same guest that is also operating on the timers, to release a lock that was not acquired. The issue leads to the hypervisor hanging or...

CVE-2020-25603

A security flaw was found in Xen. Event channels control structures can be accessed without lock as long as the port is considered to be valid. A malicious guest may be able to cause a hypervisor crash resulting in a denial of service DoS. An information leak and privilege escalation cannot be...

Missing memory barriers when accessing/allocating an event channel

ISSUE DESCRIPTION Event channels control structures can be accessed lockless as long as the port is considered to be valid. Such sequence is missing appropriate memory barrier e.g smpmb to prevent both the compiler and CPU to re-order access. IMPACT A malicious guest may be able to cause a...

The vulnerability of VMware Fusion’s hypervisor, related to privilege management errors, allows a perpetrator to elevate their privileges.

The vulnerability of VMware Fusion relates to privilege management errors. Exploiting this vulnerability can allow an attacker to enhance their privileges...

The vulnerability of the management tools for virtual infrastructure, such as VMware vCenter Server and VMware ESXi hypervisor, related to authentication deficiencies, allows attackers to cause partial service interruptions.

The vulnerability of the virtual infrastructure management tools VMware vCenter Server and VMware ESXi hypervisor is related to authentication deficiencies. Exploiting this vulnerability can allow a malicious actor to cause partial service disruption from a remote location...

Fedora: Security Advisory for xen (FEDORA-2020-eeb29955ed)

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...