Bug 2422753 (CVE-2025-68237)

Summary: CVE-2025-68237 kernel: mtdchar: fix integer overflow in read/write ioctls
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-12-16 15:02:17 UTC 
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.
Comment 1 Alexander B 2025-12-16 22:40:11 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025121635-CVE-2025-68237-7f03@gregkh/T