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.
Affected versions
Linux kernel versions
5.17
and later are affected. Fixed in
6.1.159,
6.6.118,
6.12.60,
6.17.10,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-68237 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/37944f4f8199cd153fef74e95ca268020162f212
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PatchKernel patch commithttps://git.kernel.org/stable/c/457376c6fbf0c69326a9bf1f72416225f681192b
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PatchKernel patch commithttps://git.kernel.org/stable/c/e4185bed738da755b191aa3f2e16e8b48450e1b8
Frequently asked questions
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What is CVE-2025-68237?
CVE-2025-68237 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.17 onward and has been patched in 6.1.159, 6.6.118, 6.12.60 and others. CVE-2025-68237 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-68237?
Yes — CVE-2025-68237 has been patched. Fixed versions include 6.1.159, 6.6.118, 6.12.60 and others. If you are running Linux kernel 5.17 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-68237 actively exploited?
No — CVE-2025-68237 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.