CVE-2025-68237
Unknown
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.
SeverityUnknown
CVSS—
Exploit probability—
Product
Linux
PublishedDec 16, 2025
First seenDec 16, 2025
How to fix
Update
- Linux Linuxf37efdd97fd1ec3e0d0f1eec279c8279e28f981e, 457376c6fbf0c69326a9bf1f72416225f681192b, eb9361484814fb12f3b7544b33835ea67d7a6a97, 37944f4f8199cd153fef74e95ca268020162f212, e4185bed738da755b191aa3f2e16e8b48450e1b8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 6420ac0af95dbcb2fd8452e2d551ab50e1bbad83 ≤ v < f37efdd97fd1ec3e0d0f1eec279c8279e28f981e, 6420ac0af95dbcb2fd8452e2d551ab50e1bbad83 ≤ v < 457376c6fbf0c69326a9bf1f72416225f681192b, 6420ac0af95dbcb2fd8452e2d551ab50e1bbad83 ≤ v < eb9361484814fb12f3b7544b33835ea67d7a6a97, 6420ac0af95dbcb2fd8452e2d551ab50e1bbad83 ≤ v < 37944f4f8199cd153fef74e95ca268020162f212, 6420ac0af95dbcb2fd8452e2d551ab50e1bbad83 ≤ v < e4185bed738da755b191aa3f2e16e8b48450e1b8, 5.17 | f37efdd97fd1ec3e0d0f1eec279c8279e28f981e, 457376c6fbf0c69326a9bf1f72416225f681192b, eb9361484814fb12f3b7544b33835ea67d7a6a97, 37944f4f8199cd153fef74e95ca268020162f212, e4185bed738da755b191aa3f2e16e8b48450e1b8 |
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