{"affected":[],"cveId":"CVE-2022-50731","cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: akcipher - default implementation for setting a private key\n\nChanges from v1:\n  * removed the default implementation from set_pub_key: it is assumed that\n    an implementation must always have this callback defined as there are\n    no use case for an algorithm, which doesn't need a public key\n\nMany akcipher implementations (like ECDSA) support only signature\nverifications, so they don't have all callbacks defined.\n\nCommit 78a0324f4a53 (\"crypto: akcipher - default implementations for\nrequest callbacks\") introduced default callbacks for sign/verify\noperations, which just return an error code.\n\nHowever, these are not enough, because before calling sign the caller would\nlikely call set_priv_key first on the instantiated transform (as the\nin-kernel testmgr does). This function does not have a default stub, so the\nkernel crashes, when trying to set a private key on an akcipher, which\ndoesn't support signature generation.\n\nI've noticed this, when trying to add a KAT vector for ECDSA signature to\nthe testmgr.\n\nWith this patch the testmgr returns an error in dmesg (as it should)\ninstead of crashing the kernel NULL ptr dereference.","epss":null,"exploits":[],"kev":null,"metrics":[],"modifiedAt":1794312600177,"publishedAt":1766582159770,"references":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/779a9930f3e152c82699feb389a0e6d6644e747e"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/85bc736a18b872f54912e8bb70682d11770aece0"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/95c4e20adc3ea00d1594a2a05d9b187ed12ffa8e"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/a1354bdd191d533211b7cb723aa76a66f516f197"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/bc155c6c188c2f0c5749993b1405673d25a80389"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"url":"https://git.kernel.org/stable/c/f9058178597059d6307efe96a7916600f8ede08c"}],"remediation":[],"revision":"77be0560a0dbdba451b7faedf160a2e259bfdc35f03bdfde30d556a445bb4837","sources":[{"modifiedAt":1794312600177,"name":"NVD","retrievedAt":1794313074491,"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50731"}],"ssvc":null,"status":"published","title":"CVE-2022-50731","updatedAt":1794313074491}