CVE-2025-40182

Technical 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.git

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References