Bug 2383904 (CVE-2025-38469)

Summary: CVE-2025-38469 kernel: KVM: x86/xen: Fix cleanup logic in emulation of Xen schedop poll hypercalls
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-07-28 12:02:20 UTC 
In the Linux kernel, the following vulnerability has been resolved:

KVM: x86/xen: Fix cleanup logic in emulation of Xen schedop poll hypercalls

kvm_xen_schedop_poll does a kmalloc_array() when a VM polls the host
for more than one event channel potr (nr_ports > 1).

After the kmalloc_array(), the error paths need to go through the
"out" label, but the call to kvm_read_guest_virt() does not.

[Adjusted commit message. - Paolo]
Comment 1 Avinash Hanwate 2025-07-28 15:43:45 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025072811-CVE-2025-38469-4e11@gregkh/T