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CVE-2022-50731

Estado: AplazadaSin puntuar—

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

crypto: akcipher - default implementation for setting a private 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.

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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.

Detalles técnicos trazas, registros y código del informe original
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

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2022-50731",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "78a0324f4a5328088fea9426cfe1d1851276c475",
              "lessThan": "95c4e20adc3ea00d1594a2a05d9b187ed12ffa8e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "78a0324f4a5328088fea9426cfe1d1851276c475",
              "lessThan": "a1354bdd191d533211b7cb723aa76a66f516f197",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "78a0324f4a5328088fea9426cfe1d1851276c475",
              "lessThan": "779a9930f3e152c82699feb389a0e6d6644e747e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "78a0324f4a5328088fea9426cfe1d1851276c475",
              "lessThan": "85bc736a18b872f54912e8bb70682d11770aece0",
              "versionType": "git"
            },
            {
              "status": "affected",
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              "lessThan": "f9058178597059d6307efe96a7916600f8ede08c",
              "versionType": "git"
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            {
              "status": "affected",
              "version": "78a0324f4a5328088fea9426cfe1d1851276c475",
              "lessThan": "bc155c6c188c2f0c5749993b1405673d25a80389",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "crypto/akcipher.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.2"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.2",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.4.220",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "status": "unaffected",
              "version": "5.10.150",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.75",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "5.19.17",
              "versionType": "semver",
              "lessThanOrEqual": "5.19.*"
            },
            {
              "status": "unaffected",
              "version": "6.0.3",
              "versionType": "semver",
              "lessThanOrEqual": "6.0.*"
            },
            {
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "crypto/akcipher.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-24T13:15:59.770",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/779a9930f3e152c82699feb389a0e6d6644e747e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/85bc736a18b872f54912e8bb70682d11770aece0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/95c4e20adc3ea00d1594a2a05d9b187ed12ffa8e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a1354bdd191d533211b7cb723aa76a66f516f197",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bc155c6c188c2f0c5749993b1405673d25a80389",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f9058178597059d6307efe96a7916600f8ede08c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "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."
    }
  ],
  "lastModified": "2026-06-17T05:24:04.930",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}