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 ...

AZL-74309 CVE-2025-71078 affecting package kernel for versions less than 6.6.121.1-1

In the Linux kernel, the following vulnerability has been resolved: powerpc/64s/slb: Fix SLB multihit issue during SLB preload On systems using the hash MMU, there is a software SLB preload cache that mirrors the entries loaded into the hardware SLB buffer. This preload cache is subject to period...

CVE-2025-71078

In the Linux kernel, the following vulnerability has been resolved: powerpc/64s/slb: Fix SLB multihit issue during SLB preload On systems using the hash MMU, there is a software SLB preload cache that mirrors the entries loaded into the hardware SLB buffer. This preload cache is subject to period...

CVE-2025-71078

CVE-2025-71078 describes a Linux kernel fix for a SLB multihit issue on hash MMU POWERPC 64s. The root cause is a mismatch between the hardware SLB and the software preload cache when the kernel optimizes switch_mm_irqs_off by not calling switch_mmu_context() if prev and next mm_struct are the sa...

CVE-2025-71078 powerpc/64s/slb: Fix SLB multihit issue during SLB preload

In the Linux kernel, the following vulnerability has been resolved: powerpc/64s/slb: Fix SLB multihit issue during SLB preload On systems using the hash MMU, there is a software SLB preload cache that mirrors the entries loaded into the hardware SLB buffer. This preload cache is subject to period...

CVE-2025-71078

In the Linux kernel, the following vulnerability has been resolved: powerpc/64s/slb: Fix SLB multihit issue during SLB preload On systems using the hash MMU, there is a software SLB preload cache that mirrors the entries loaded into the hardware SLB buffer. This preload cache is subject to period...

PT-2026-2599

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description The Linux kernel contains a flaw in the powerpc/64s/slb subsystem related to the SLB preload cache on systems utilizing a hash MMU. Specifically, inconsistencies can arise between the...

CVE-2025-40160

In the Linux kernel, the following vulnerability has been resolved: xen/events: Return -EEXIST for bound VIRQs Change findvirq to return -EEXIST when a VIRQ is bound to a different CPU than the one passed in. With that, remove the BUGON from bindvirqtoirq to propogate the error upwards. Some VIRQ...

UBUNTU-CVE-2025-40160

In the Linux kernel, the following vulnerability has been resolved: xen/events: Return -EEXIST for bound VIRQs Change findvirq to return -EEXIST when a VIRQ is bound to a different CPU than the one passed in. With that, remove the BUGON from bindvirqtoirq to propogate the error upwards. Some VIRQ...

CVE-2025-40160

CVE-2025-40160: In the Linux kernel Xen event handling, find_virq() now returns -EEXIST when a VIRQ bound to a different CPU, replacing the previous BUG_ON() path. This affects per-domain/global VIRQs (which must be bound to CPU0 before migration). A second bind for per-domain/global VIRQs is tre...

CVE-2022-50100

In the Linux kernel, the following vulnerability has been resolved: sched/core: Do not requeue task on CPU excluded from cpusmask The following warning was triggered on a large machine early in boot on a distribution kernel but the same problem should also affect mainline. WARNING: CPU: 439 PID: ...

UBUNTU-CVE-2024-58057

In the Linux kernel, the following vulnerability has been resolved: idpf: convert workqueues to unbound When a workqueue is created with WQUNBOUND, its work items are served by special worker-pools, whose host workers are not bound to any specific CPU. In the default configuration i.e. when...

CVE-2024-42300 erofs: fix race in z_erofs_get_gbuf()

In the Linux kernel, the following vulnerability has been resolved: erofs: fix race in zerofsgetgbuf In zerofsgetgbuf, the current task may be migrated to another CPU between zerofsgbufid and spinlock&gbuf-lock. Therefore, zerofsputgbuf will trigger the following issue which was found by stress...

Important: Red Hat Security Advisory: kernel-rt security and bug fix update

An update for kernel-rt is now available for Red Hat Enterprise MRG 2. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from t...

Important: Red Hat Security Advisory: kernel-rt security and bug fix update

An update for kernel-rt is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from...