CVE-2025-40193
Published Nov 12, 2025
Modified Apr 15, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: xtensa: simdisk: add input size check in proc_write_simdisk A malicious user could pass an arbitrarily bad value to memdup_user_nul(), potentially causing kernel crash. This follows the same pattern as commit ee76746387f6 ("netdevsim: prevent bad user input in nsim_dev_health_break_write()")
Is your site exposed to CVE-2025-40193?
Run a free security scan — no signup, results in seconds.
References
Other References
https://git.kernel.org/stable/c/151bd88859474cdaccc1e4c8b21fbf72dbba2ab4
https://git.kernel.org/stable/c/5d5f08fd0cd970184376bee07d59f635c8403f63
https://git.kernel.org/stable/c/a0c2c36d864ef3676b05cfd8c58b72ee3214cb1a
https://git.kernel.org/stable/c/d381de7fd4cdc928ede96987dc64b133e6480dd6
https://git.kernel.org/stable/c/f40405ccfb87b71175f2d5d004c0b8a0aebcc2cf
Frequently Asked Questions
What is CVE-2025-40193? +
In the Linux kernel, the following vulnerability has been resolved:
xtensa: simdisk: add input size check in proc_write_simdisk
A malicious user could pass an arbitrarily bad value
to memdup_user_nul(), potentially causing kernel crash.
This follows the same pattern as commit ee76746387f6
("netdevsim: prevent bad user input in nsim_dev_health_break_write()")
How do I check if I'm vulnerable to CVE-2025-40193? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.