Bug 2395789 (CVE-2025-39815)

Summary: CVE-2025-39815 kernel: RISC-V: KVM: fix stack overrun when loading vlenb
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 2025-09-16 14:02:36 UTC 
In the Linux kernel, the following vulnerability has been resolved:

RISC-V: KVM: fix stack overrun when loading vlenb

The userspace load can put up to 2048 bits into an xlen bit stack
buffer.  We want only xlen bits, so check the size beforehand.
Comment 1 Keith Grant 2025-09-16 16:01:16 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091615-CVE-2025-39815-a663@gregkh/T