Vulnerability in Linux
CVE-2025-39815
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.
EPSS: 0.002 (4.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Linux — versions 2fa290372dfe7dd248b1c16f943f273a3e674f22, 6.8, 0
- Linux Linux_kernel — versions 6.17
Public proof-of-concept exploits
References
Frequently asked questions
- What is CVE-2025-39815?
- CVE-2025-39815 is a high-severity vulnerability in Linux. CVSS score: 7.8/10. Published 2025-09-16.
- How severe is CVE-2025-39815?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2025-39815 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.