CVE-2024-26584

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

net: tls: handle backlogging of crypto requests

Since were setting the CRYPTO_TFM_REQ_MAY_BACKLOG flag on our requests to the crypto API, crypto_aead_{encrypt,decrypt} can return -EBUSY instead of -EINPROGRESS in valid situations. For example, when the cryptd queue for AESNI is full (easy to trigger with an artificially low cryptd.cryptd_max_cpu_qlen), requests will be enqueued to the backlog but still processed. In that case, the async callback will also be called twice: first with err == -EINPROGRESS, which it seems we can just ignore, then with err == 0.

Compared to Sabrinas original patch this version uses the new tls_*crypt_async_wait() helpers and converts the EBUSY to EINPROGRESS to avoid having to modify all the error handling paths. The handling is identical.

Weakness

The product does not handle or incorrectly handles an exceptional condition.

Affected Software

References

• https://git.kernel.org/stable/c/13eca403876bbea3716e82cdfe6f1e6febb38754
• https://git.kernel.org/stable/c/3ade391adc584f17b5570fd205de3ad029090368
• https://git.kernel.org/stable/c/8590541473188741055d27b955db0777569438e3
• https://git.kernel.org/stable/c/ab6397f072e5097f267abf5cb08a8004e6b17694
• https://git.kernel.org/stable/c/cd1bbca03f3c1d845ce274c0d0a66de8e5929f72