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

CVE-2026-23553 is an issue in the Xen hypervisor: during context switches, Xen may skip IBPB when a vCPU returns to the same physical CPU, potentially allowing stale BTB/GPU state to persist across tasks and undermine guest kernel isolation. The advisory chain shows the vulnerability is tied to i...

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 ...

Xen security vulnerabilities

Xen is an open-source virtual machine monitor product developed by Xen. This product allows different and incompatible operating systems to run on the same computer. It also supports migration during runtime, ensuring smooth operation and avoiding downtime. Xen has security vulnerabilities; these...

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 ...

Security update for xen

This update for xen fixes the following issues: CVE-2025-58150: Fixed buffer overrun with shadow paging and tracing XSA-477 bsc1256745 CVE-2026-23553: Fixed incomplete IBPB for vCPU isolation XSA-479 bsc1256747 Special Instructions and Notes: Please reboot the system after installing this update...

SUSE-SU-2026:0306-1 Security update for xen

This update for xen fixes the following issues: - CVE-2025-58150: Fixed buffer overrun with shadow paging and tracing XSA-477 bsc1256745 - CVE-2026-23553: Fixed incomplete IBPB for vCPU isolation XSA-479 bsc1256747...

SUSE-SU-2026:0304-1 Security update for xen

This update for xen fixes the following issues: - CVE-2025-58150: Fixed buffer overrun with shadow paging and tracing XSA-477 bsc1256745 - CVE-2026-23553: Fixed incomplete IBPB for vCPU isolation XSA-479 bsc1256747...

SUSE-SU-2026:0303-1 Security update for xen

This update for xen fixes the following issues: Security fixes: - CVE-2025-58150: Fixed buffer overrun with shadow paging and tracing XSA-477 bsc1256745 - CVE-2026-23553: Fixed incomplete IBPB for vCPU isolation XSA-479 bsc1256747 - CVE-2025-58149: Fixed incorrect removal od permissions on PCI...

x86: incomplete IBPB for vCPU isolation

ISSUE DESCRIPTION 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 CP...

CVE-2025-71159

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free warning in btrfsgetorcreatedelayednode Previously, btrfsgetorcreatedelayednode set the delayednode's refcount before acquiring the root-delayednodes lock. Commit e8513c012de7 "btrfs: implement reftracker...

UBUNTU-CVE-2025-71159

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free warning in btrfsgetorcreatedelayednode Previously, btrfsgetorcreatedelayednode set the delayednode's refcount before acquiring the root-delayednodes lock. Commit e8513c012de7 "btrfs: implement reftracker...

CVE-2025-71159 btrfs: fix use-after-free warning in btrfs_get_or_create_delayed_node()

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free warning in btrfsgetorcreatedelayednode Previously, btrfsgetorcreatedelayednode set the delayednode's refcount before acquiring the root-delayednodes lock. Commit e8513c012de7 "btrfs: implement reftracker...

CVE-2025-71159

CVE-2025-71159 — Linux kernel btrfs use-after-free in delayed inode . Affected: the btrfs_get_or_create_delayed_node() path in fs/btrfs/delayed-inode.c. Root cause: the delayed_node refcount was set before acquiring root->delayed_nodes, creating a missing memory barrier and allowing stores to ...

CVE-2025-71159 btrfs: fix use-after-free warning in btrfs_get_or_create_delayed_node()

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free warning in btrfsgetorcreatedelayednode Previously, btrfsgetorcreatedelayednode set the delayednode's refcount before acquiring the root-delayednodes lock. Commit e8513c012de7 "btrfs: implement reftracker...

CVE-2025-71159

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free warning in btrfsgetorcreatedelayednode Previously, btrfsgetorcreatedelayednode set the delayednode's refcount before acquiring the root-delayednodes lock. Commit e8513c012de7 "btrfs: implement reftracker...

Linux Distros Unpatched Vulnerability : CVE-2025-71159

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free warning in btrfsgetorcreatedelayednode Previously,...

MiracleLinux 9 : kernel-5.14.0-427.26.1.el9_4 (AXSA:2024-8593:22)

The remote MiracleLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2024-8593:22 advisory. kernel: TIPC message reassembly use-after-free remote code execution vulnerability CVE-2024-36886 kernel: ethernet: hisilicon: hns: hnsdsafmisc: fix...

Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-004372)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-004372 advisory. A flaw was found in the Linux kernel before 5.8-rc1 in the implementation of the Enhanced IBPB Indirect Branch Prediction Barrier. The IBPB mitigation will be disabl...