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()")
Affected versions
Linux kernel versions
3.9
and later are affected. Fixed in
6.1.157,
6.6.113,
6.12.54,
6.17.4,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40193 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/151bd88859474cdaccc1e4c8b21fbf72dbba2ab4
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PatchKernel patch commithttps://git.kernel.org/stable/c/5d5f08fd0cd970184376bee07d59f635c8403f63
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PatchKernel patch commithttps://git.kernel.org/stable/c/a0c2c36d864ef3676b05cfd8c58b72ee3214cb1a
Frequently asked questions
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What is CVE-2025-40193?
CVE-2025-40193 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 3.9 onward and has been patched in 6.1.157, 6.6.113, 6.12.54 and others. CVE-2025-40193 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-2025-40193?
Yes — CVE-2025-40193 has been patched. Fixed versions include 6.1.157, 6.6.113, 6.12.54 and others. If you are running Linux kernel 3.9 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40193 actively exploited?
No — CVE-2025-40193 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.