CVE-2022-50731

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: akcipher - default implementation for setting a private key Changes from v1: * removed the default implementation from set_pub_key: it is assumed that an implementation must always have this callback defined as there are no use case for an algorithm, which doesn't need a public key Many akcipher implementations (like ECDSA) support only signature verifications, so they don't have all callbacks defined. Commit 78a0324f4a53 ("crypto: akcipher - default implementations for request callbacks") introduced default callbacks for sign/verify operations, which just return an error code. However, these are not enough, because before calling sign the caller would likely call set_priv_key first on the instantiated transform (as the in-kernel testmgr does). This function does not have a default stub, so the kernel crashes, when trying to set a private key on an akcipher, which doesn't support signature generation. I've noticed this, when trying to add a KAT vector for ECDSA signature to the testmgr. With this patch the testmgr returns an error in dmesg (as it should) instead of crashing the kernel NULL ptr dereference.

PUBLISHED Reserved 2025-12-24 | Published 2025-12-24 | Updated 2025-12-24 | Assigner Linux

Product status

References

git.kernel.org/...c/95c4e20adc3ea00d1594a2a05d9b187ed12ffa8e

git.kernel.org/...c/a1354bdd191d533211b7cb723aa76a66f516f197

git.kernel.org/...c/779a9930f3e152c82699feb389a0e6d6644e747e

git.kernel.org/...c/85bc736a18b872f54912e8bb70682d11770aece0

git.kernel.org/...c/f9058178597059d6307efe96a7916600f8ede08c

git.kernel.org/...c/bc155c6c188c2f0c5749993b1405673d25a80389

cve.org (CVE-2022-50731)

nvd.nist.gov (CVE-2022-50731)

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