Bug 2461444 (CVE-2026-31569)

Summary: CVE-2026-31569 kernel: LoongArch: KVM: Handle the case that EIOINTC's coremap is empty
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) component. When a specific internal data structure, known as EIOINTC's coremap, is empty, the system incorrectly processes a processor ID. This error can lead to an out-of-bounds memory access, meaning the system tries to read or write data beyond its allocated memory space. Such an issue could result in system instability, causing the system to crash, or potentially lead to the disclosure of sensitive information.
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Description OSIDB Bzimport 2026-04-24 15:01:54 UTC 
In the Linux kernel, the following vulnerability has been resolved:

LoongArch: KVM: Handle the case that EIOINTC's coremap is empty

EIOINTC's coremap in eiointc_update_sw_coremap() can be empty, currently
we get a cpuid with -1 in this case, but we actually need 0 because it's
similar as the case that cpuid >= 4.

This fix an out-of-bounds access to kvm_arch::phyid_map::phys_map[].
Comment 1 Keith Grant 2026-04-24 17:59:01 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026042401-CVE-2026-31569-41ce@gregkh/T