Linux Kernel CVE-2025-68726

In the Linux kernel, the following vulnerability has been resolved:

crypto: aead - 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 instead of setting reqsize using crypto_*_set_reqsize(). Using cra_reqsize in aead 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. [1]

Add proper set_reqsize calls in the aead init function to properly initialize reqsize for these algorithms in the framework.

[1]: https://gist.github.com/Pratham-T/24247446f1faf4b7843e4014d5089f6b

The affected product is the mainline and stable Linux kernel, in the window between the introduction of cra_reqsize by commit afddce13ce81d and the corrective commits. No exact kernel version range or CPE was provided in the input; affected/fixed points are identified only by stable-tree commit hashes 12b413f5460c393d1151a37f591140693eca0f84, 64377e66e187164bd6737112d07257f5f0feb681, and 9b04d8f00569573796dd05397f5779135593eb24 (git.kernel.org). Any distribution kernel that backported the cra_reqsize change to AEAD without the corresponding set_reqsize fix is potentially affected; distributors should map these commits to their own package versions.