[SECURITY] Fedora 42 Update: xen-4.19.4-2.fc42

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

[SECURITY] Fedora 43 Update: xen-4.20.2-3.fc43

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

CVE-2026-23553

In the context switch logic Xen attempts to skip an IBPB in the case of a vCPU returning to a CPU on which it was the previous vCPU to run. While safe for Xen's isolation between vCPUs, this prevents the guest kernel correctly isolating between tasks. Consider: 1 vCPU runs on CPU A, running task ...

CVE-2026-23553

In the context switch logic Xen attempts to skip an IBPB in the case of a vCPU returning to a CPU on which it was the previous vCPU to run. While safe for Xen's isolation between vCPUs, this prevents the guest kernel correctly isolating between tasks. Consider: 1 vCPU runs on CPU A, running task ...

ALPINE-CVE-2026-23553

In the context switch logic Xen attempts to skip an IBPB in the case of a vCPU returning to a CPU on which it was the previous vCPU to run. While safe for Xen's isolation between vCPUs, this prevents the guest kernel correctly isolating between tasks. Consider: 1 vCPU runs on CPU A, running task ...

UBUNTU-CVE-2026-23553

In the context switch logic Xen attempts to skip an IBPB in the case of a vCPU returning to a CPU on which it was the previous vCPU to run. While safe for Xen's isolation between vCPUs, this prevents the guest kernel correctly isolating between tasks. Consider: 1 vCPU runs on CPU A, running task ...

CVE-2026-23553

In the context switch logic Xen attempts to skip an IBPB in the case of a vCPU returning to a CPU on which it was the previous vCPU to run. While safe for Xen's isolation between vCPUs, this prevents the guest kernel correctly isolating between tasks. Consider: 1 vCPU runs on CPU A, running task ...

CVE-2026-23553

The Xen hypervisor contains a flaw in its context switch logic where it attempts to skip an Indirect Branch Prediction Barrier (IBPB) when a vCPU returns to a CPU where it was the previous vCPU to run. While this maintains isolation between vCPUs, it prevents the guest kernel from correctly isola...

EUVD-2026-4882

In the context switch logic Xen attempts to skip an IBPB in the case of a vCPU returning to a CPU on which it was the previous vCPU to run. While safe for Xen's isolation between vCPUs, this prevents the guest kernel correctly isolating between tasks. Consider: 1 vCPU runs on CPU A, running task ...

Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-001278)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-001278 advisory. An issue was discovered in the Linux kernel through 4.17.11, as used in Xen through 4.11.x. The xenfailsafecallback entry point in arch/x86/entry/entry64.S does not...

Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-000732)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-000732 advisory. The PCI backend driver in Xen, when running on an x86 system and using Linux 3.1.x through 4.3.x as the driver domain, allows local guest administrators to hit BUG...

Unity Linux 20.1070e Security Update: kernel (UTSA-2026-001357)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-001357 advisory. 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...

Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-001816)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-001816 advisory. The netback driver in Xen, when using certain Linux versions that do not allow sleeping in softirq context, allows local guest administrators to cause a denial of...

Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2026-002090)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-002090 advisory. The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a denial of service host OS panic or hang by...

CVE-2021-28707

PoD operations on misaligned GFNs This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE. x86 HVM and PVH guests may be started in populate-on-demand PoD mode, to provide a way for them to later easily have more memory assigne...

CVE-2021-28703

grant table v2 status pages may remain accessible after de-allocation take two Guest get permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, get de-allocated whe...

USN-7934-1 linux-azure, linux-azure-6.14 vulnerabilities

It was discovered that improper initialization of CPU cache memory could allow a local attacker with hypervisor access to overwrite SEV-SNP guest memory resulting in loss of data integrity. CVE-2024-36331 Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered that the Linux...

The vulnerability of the send_ipi() function in cross-platform Xen hypervisors of Linux operating systems allows attackers to access confidential information.

The vulnerability of the sendipi function in the cross-platform hypervisor of the Linux operating system is related to reading data outside of the allowed range. Exploiting this vulnerability can allow a remote attacker to gain access to confidential information...

USN-7879-4 linux-gcp-6.14, linux-raspi vulnerabilities

It was discovered that improper initialization of CPU cache memory could allow a local attacker with hypervisor access to overwrite SEV-SNP guest memory resulting in loss of data integrity. CVE-2024-36331 Several security issues were discovered in the Linux kernel. An attacker could possibly use...

[SECURITY] [DSA 6068-1] xen security update

------------------------------------------------------------------------- Debian Security Advisory DSA-6068-1 [email protected] https://www.debian.org/security/ Moritz Muehlenhoff December 02, 2025 https://www.debian.org/security/faq -...