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CVE-2026-74438

Estado: RecibidaAlta (7.8)—

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

crypto: sun4i-ss - Remove insecure and unused rng_alg

Remove sun4i_ss_rng, as it is insecure and unused:

The sun4i_ss_prng_seed() buffer overflow was reported by Tianchu Chen and discovered by Atuin - Automated Vulnerability Discovery Engine

There's no point in fixing all these vulnerabilities individually when this is unused code, so let's just remove it.

Detalles técnicos trazas, registros y código del informe original
- It has multiple vulnerabilities.  sun4i_ss_prng_seed() is missing
  locking and has a buffer overflow.  sun4i_ss_prng_generate() fails to
  fill the entire buffer with cryptographic random bytes, because it
  rounds the destination length down and also doesn't actually wait for
  the hardware to be ready before pulling bytes from it.

- No user of this code is known.  It's usable only theoretically via the
  "rng" algorithm type of AF_ALG.  But userspace actually just uses the
  actual Linux RNG (/dev/random etc) instead.  And rng_algs don't
  contribute entropy to the actual Linux RNG either.  (This may have
  been confused with hwrng, which does contribute entropy.)

CVSS

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad local (AV:L, PR:L) en kernel Linux con desbordamiento de búfer en sun4i_ss_prng_seed() sin sincronización. Permite escalada de privilegios desde usuario local hacia acceso administrativo del kernel.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

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)

Mostrar
{
  "id": "CVE-2026-74438",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "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": "b8ae5c7387ad075ee61e8c8774ce2bca46bc9236",
              "lessThan": "2eafecaba1b46bb9774eaf3556619fd5b6a17c1c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b8ae5c7387ad075ee61e8c8774ce2bca46bc9236",
              "lessThan": "ee2458f8188732aa53a5d42f56e87bfad288b44e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b8ae5c7387ad075ee61e8c8774ce2bca46bc9236",
              "lessThan": "306ded31bfa00a69d25823a60d7c797170bfb4f8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b8ae5c7387ad075ee61e8c8774ce2bca46bc9236",
              "lessThan": "e4b7b9819811c4c51064c3d3d3c02f0be7491707",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b8ae5c7387ad075ee61e8c8774ce2bca46bc9236",
              "lessThan": "c401492e01c7bfd38cf14c94d85c7efafe7d1a25",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b8ae5c7387ad075ee61e8c8774ce2bca46bc9236",
              "lessThan": "9c8086d9511189c34dfa3f9e3a03f2bee12f56a5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b8ae5c7387ad075ee61e8c8774ce2bca46bc9236",
              "lessThan": "b2c41fa9dd8fc740c489e060b199165771f268d1",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "arch/arm/configs/sunxi_defconfig",
            "drivers/crypto/allwinner/Kconfig",
            "drivers/crypto/allwinner/sun4i-ss/Makefile",
            "drivers/crypto/allwinner/sun4i-ss/sun4i-ss-core.c",
            "drivers/crypto/allwinner/sun4i-ss/sun4i-ss-prng.c",
            "drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.14"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.14",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "arch/arm/configs/sunxi_defconfig",
            "drivers/crypto/allwinner/Kconfig",
            "drivers/crypto/allwinner/sun4i-ss/Makefile",
            "drivers/crypto/allwinner/sun4i-ss/sun4i-ss-core.c",
            "drivers/crypto/allwinner/sun4i-ss/sun4i-ss-prng.c",
            "drivers/crypto/allwinner/sun4i-ss/sun4i-ss.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:22:45.903",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/2eafecaba1b46bb9774eaf3556619fd5b6a17c1c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/306ded31bfa00a69d25823a60d7c797170bfb4f8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9c8086d9511189c34dfa3f9e3a03f2bee12f56a5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b2c41fa9dd8fc740c489e060b199165771f268d1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c401492e01c7bfd38cf14c94d85c7efafe7d1a25",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e4b7b9819811c4c51064c3d3d3c02f0be7491707",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ee2458f8188732aa53a5d42f56e87bfad288b44e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: sun4i-ss - Remove insecure and unused rng_alg\n\nRemove sun4i_ss_rng, as it is insecure and unused:\n\n- It has multiple vulnerabilities.  sun4i_ss_prng_seed() is missing\n  locking and has a buffer overflow.  sun4i_ss_prng_generate() fails to\n  fill the entire buffer with cryptographic random bytes, because it\n  rounds the destination length down and also doesn't actually wait for\n  the hardware to be ready before pulling bytes from it.\n\n- No user of this code is known.  It's usable only theoretically via the\n  \"rng\" algorithm type of AF_ALG.  But userspace actually just uses the\n  actual Linux RNG (/dev/random etc) instead.  And rng_algs don't\n  contribute entropy to the actual Linux RNG either.  (This may have\n  been confused with hwrng, which does contribute entropy.)\n\nThe sun4i_ss_prng_seed() buffer overflow was reported by Tianchu Chen\nand discovered by Atuin - Automated Vulnerability Discovery Engine\n\nThere's no point in fixing all these vulnerabilities individually when\nthis is unused code, so let's just remove it."
    }
  ],
  "lastModified": "2026-08-17T06:19:39.477",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}