CVE-2025-40160 - xen/events: Return -EEXIST for bound VIRQs

CVE-2025-40160 - xen/events: Return -EEXIST for bound VIRQs

https://cvefeed.io/rssfeed/latest.atom / Wed, 11/12/2025 - 13:48
CVE ID : CVE-2025-40160
Published : Nov. 12, 2025, 10:24 a.m. | 35 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: xen/events: Return -EEXIST for bound VIRQs Change find_virq() to return -EEXIST when a VIRQ is bound to a different CPU than the one passed in. With that, remove the BUG_ON() from bind_virq_to_irq() to propogate the error upwards. Some VIRQs are per-cpu, but others are per-domain or global. Those must be bound to CPU0 and can then migrate elsewhere. The lookup for per-domain and global will probably fail when migrated off CPU 0, especially when the current CPU is tracked. This now returns -EEXIST instead of BUG_ON(). A second call to bind a per-domain or global VIRQ is not expected, but make it non-fatal to avoid trying to look up the irq, since we don't know which per_cpu(virq_to_irq) it will be in.
Severity: 0.0 | NA
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