{"id":"CVE-2022-50731","state":"PUBLISHED","title":"crypto: akcipher - default implementation for setting a private key","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.","publishedAt":"2025-12-24T12:22:51.122Z","updatedAt":"2026-05-11T19:24:25.645Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"78a0324f4a5328088fea9426cfe1d1851276c475","status":"affected","lessThan":"95c4e20adc3ea00d1594a2a05d9b187ed12ffa8e","versionType":"git"},{"version":"78a0324f4a5328088fea9426cfe1d1851276c475","status":"affected","lessThan":"a1354bdd191d533211b7cb723aa76a66f516f197","versionType":"git"},{"version":"78a0324f4a5328088fea9426cfe1d1851276c475","status":"affected","lessThan":"779a9930f3e152c82699feb389a0e6d6644e747e","versionType":"git"},{"version":"78a0324f4a5328088fea9426cfe1d1851276c475","status":"affected","lessThan":"85bc736a18b872f54912e8bb70682d11770aece0","versionType":"git"},{"version":"78a0324f4a5328088fea9426cfe1d1851276c475","status":"affected","lessThan":"f9058178597059d6307efe96a7916600f8ede08c","versionType":"git"},{"version":"78a0324f4a5328088fea9426cfe1d1851276c475","status":"affected","lessThan":"bc155c6c188c2f0c5749993b1405673d25a80389","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["crypto/akcipher.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.2","versionType":"semver"},{"version":"5.4.220","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.150","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.75","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.19.17","status":"unaffected","lessThanOrEqual":"5.19.*","versionType":"semver"},{"version":"6.0.3","status":"unaffected","lessThanOrEqual":"6.0.*","versionType":"semver"},{"version":"6.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["crypto/akcipher.c"]}],"references":["https://git.kernel.org/stable/c/95c4e20adc3ea00d1594a2a05d9b187ed12ffa8e","https://git.kernel.org/stable/c/a1354bdd191d533211b7cb723aa76a66f516f197","https://git.kernel.org/stable/c/779a9930f3e152c82699feb389a0e6d6644e747e","https://git.kernel.org/stable/c/85bc736a18b872f54912e8bb70682d11770aece0","https://git.kernel.org/stable/c/f9058178597059d6307efe96a7916600f8ede08c","https://git.kernel.org/stable/c/bc155c6c188c2f0c5749993b1405673d25a80389"],"weaknesses":[],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/50xxx/CVE-2022-50731.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-50731","state":"PUBLISHED","datePublished":"2025-12-24T12:22:51.122Z","dateUpdated":"2026-05-11T19:24:25.645Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-24T12:20:40.331Z"},"containers":{"cna":{"title":"crypto: akcipher - default implementation for setting a private key","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"78a0324f4a5328088fea9426cfe1d1851276c475","status":"affected","lessThan":"95c4e20adc3ea00d1594a2a05d9b187ed12ffa8e","versionType":"git"},{"version":"78a0324f4a5328088fea9426cfe1d1851276c475","status":"affected","lessThan":"a1354bdd191d533211b7cb723aa76a66f516f197","versionType":"git"},{"version":"78a0324f4a5328088fea9426cfe1d1851276c475","status":"affected","lessThan":"779a9930f3e152c82699feb389a0e6d6644e747e","versionType":"git"},{"version":"78a0324f4a5328088fea9426cfe1d1851276c475","status":"affected","lessThan":"85bc736a18b872f54912e8bb70682d11770aece0","versionType":"git"},{"version":"78a0324f4a5328088fea9426cfe1d1851276c475","status":"affected","lessThan":"f9058178597059d6307efe96a7916600f8ede08c","versionType":"git"},{"version":"78a0324f4a5328088fea9426cfe1d1851276c475","status":"affected","lessThan":"bc155c6c188c2f0c5749993b1405673d25a80389","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["crypto/akcipher.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.2","versionType":"semver"},{"version":"5.4.220","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.150","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.75","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.19.17","status":"unaffected","lessThanOrEqual":"5.19.*","versionType":"semver"},{"version":"6.0.3","status":"unaffected","lessThanOrEqual":"6.0.*","versionType":"semver"},{"version":"6.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["crypto/akcipher.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/95c4e20adc3ea00d1594a2a05d9b187ed12ffa8e"},{"url":"https://git.kernel.org/stable/c/a1354bdd191d533211b7cb723aa76a66f516f197"},{"url":"https://git.kernel.org/stable/c/779a9930f3e152c82699feb389a0e6d6644e747e"},{"url":"https://git.kernel.org/stable/c/85bc736a18b872f54912e8bb70682d11770aece0"},{"url":"https://git.kernel.org/stable/c/f9058178597059d6307efe96a7916600f8ede08c"},{"url":"https://git.kernel.org/stable/c/bc155c6c188c2f0c5749993b1405673d25a80389"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:24:25.645Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"5.4.220"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"5.10.150"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"5.15.75"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"5.19.17"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"6.0.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"6.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}