High 7.8Published Sep 16, 2025

CVE-2025-39815RISC-V: KVM: fix stack overrun when loading vlenb

Updated under an hour ago (Oct 27, 2026, 3:50 PM ET)

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 2fa290372dfe7dd248b1c16f943f273a3e674f22 before c76bf8359188a11f8fd790e5bbd6077894a245cc; from 2fa290372dfe7dd248b1c16f943f273a3e674f22 before 6d28659b692a0212f360f8bd8a58712b339f9aac; from 2fa290372dfe7dd248b1c16f943f273a3e674f22 before 799766208f09f95677a9ab111b93872d414fbad7	CNA record
linux linux_kernel linux:linux_kernel	from 6.8 before 6.12.45; from 6.13 before 6.16.5; 6.17; 6.17; 6.17	NVD

References

References

https://git.kernel.org/stable/c/c76bf8359188a11f8fd790e5bbd6077894a245cc	patch
https://git.kernel.org/stable/c/6d28659b692a0212f360f8bd8a58712b339f9aac	patch
https://git.kernel.org/stable/c/799766208f09f95677a9ab111b93872d414fbad7	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.