CVE-2025-68237
Published Dec 16, 2025
Modified Apr 15, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: mtdchar: fix integer overflow in read/write ioctls The "req.start" and "req.len" variables are u64 values that come from the user at the start of the function. We mask away the high 32 bits of "req.len" so that's capped at U32_MAX but the "req.start" variable can go up to U64_MAX which means that the addition can still integer overflow. Use check_add_overflow() to fix this bug.
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References
Other References
https://git.kernel.org/stable/c/37944f4f8199cd153fef74e95ca268020162f212
https://git.kernel.org/stable/c/457376c6fbf0c69326a9bf1f72416225f681192b
https://git.kernel.org/stable/c/e4185bed738da755b191aa3f2e16e8b48450e1b8
https://git.kernel.org/stable/c/eb9361484814fb12f3b7544b33835ea67d7a6a97
https://git.kernel.org/stable/c/f37efdd97fd1ec3e0d0f1eec279c8279e28f981e
Frequently Asked Questions
What is CVE-2025-68237? +
In the Linux kernel, the following vulnerability has been resolved:
mtdchar: fix integer overflow in read/write ioctls
The "req.start" and "req.len" variables are u64 values that come from the
user at the start of the function. We mask away the high 32 bits of
"req.len" so that's capped at U32_MAX but the "req.start" variable can go
up to U64_MAX which means that the addition can still integer overflow.
Use check_add_overflow() to fix this bug.
How do I check if I'm vulnerable to CVE-2025-68237? +
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.