CVE-2025-40182
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-11-12

Last updated on: 2025-11-14

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: crypto: skcipher - Fix reqsize handling Commit afddce13ce81d ("crypto: api - Add reqsize to crypto_alg") introduced cra_reqsize field in crypto_alg struct to replace type specific reqsize fields. It looks like this was introduced specifically for ahash and acomp from the commit description as subsequent commits add necessary changes in these alg frameworks. However, this is being recommended for use in all crypto algs [1] instead of setting reqsize using crypto_*_set_reqsize(). Using cra_reqsize in skcipher algorithms, hence, causes memory corruptions and crashes as the underlying functions in the algorithm framework have not been updated to set the reqsize properly from cra_reqsize. [2] Add proper set_reqsize calls in the skcipher init function to properly initialize reqsize for these algorithms in the framework. [1]: https://lore.kernel.org/linux-crypto/[email protected]/ [2]: https://gist.github.com/Pratham-T/24247446f1faf4b7843e4014d5089f6b
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Meta Information
Published
2025-11-12
Last Modified
2025-11-14
Generated
2026-05-07
AI Q&A
2025-11-13
EPSS Evaluated
2026-05-05
NVD
CVE-2025-40182
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
Helpful Resources
Exploitability
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CWE ID Description
CWE-UNKNOWN
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AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is in the Linux kernel's crypto subsystem, specifically in the skcipher (symmetric key cipher) algorithms. A recent change introduced a new field called cra_reqsize to replace older request size fields. However, this field was not properly handled in skcipher algorithms, causing memory corruptions and crashes because the reqsize was not correctly initialized. The fix involved adding proper set_reqsize calls during the initialization of these algorithms to prevent such issues.


How can this vulnerability impact me? :

This vulnerability can cause memory corruption and crashes in the Linux kernel when using certain cryptographic algorithms. This can lead to system instability, potential denial of service, or unexpected behavior in applications relying on these crypto functions.


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