CVE-2026-74610

Estado: RecibidaAlta (7.8)—

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

tls: don't leave a full plaintext sk_msg ring unpushed

When the copy path in tls_sw_sendmsg_locked() adds the fragment that fills the plaintext sk_msg ring, it does not set full_record, so the record is left full and unpushed. A later splice() then adds to an already full ring: sk_msg_page_add() has no fullness check of its own, so sg.end wraps onto sg.start and the ring appears empty. Fragments added after that overwrite live entries, and sg.size no longer matches what is reachable between sg.start and sg.end, so pushing the record runs the scatterwalk off the end of the scatterlist.

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An unprivileged user can trigger this on a loopback TCP socket with the "tls" ULP attached:

Set full_record in the copy path when the ring becomes full, and push a record that is already full on entry to the sendmsg loop.

Detalles técnicos trazas, registros y código del informe original

  BUG: kernel NULL pointer dereference, address: 0000000000000008
  RIP: 0010:memcpy_from_scatterwalk+0x32/0xc0
  Call Trace:
   skcipher_walk_next+0x1d1/0x2c0
   gcm_encrypt_aesni_avx+0x1e9/0x220
   bpf_exec_tx_verdict+0x3bb/0x860
   tls_sw_sendmsg+0xa1a/0xca0
   __sys_sendto+0x1da/0x1f0

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.18%
Percentil entre todas las CVEs puntuadas: 6
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1499.004 Application or System Exploitationimpact75 %

Acceso local (AV:L, PR:L) sin interacción. Vulnerabilidad de corrupción de memoria en kernel que causa NULL pointer dereference (BUG), permitiendo DoS por crash de servicios TLS.

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 Program Filter Network Traffic Execution Prevention Application Isolation and Sandboxing Exploit Protection Update 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 Kernel^AI

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-74610",
  "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
      }
    ]
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  "affected": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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              "status": "affected",
              "version": "fe1e81d4f73b6cbaed4fcc476960d26770642842",
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          ],
          "programFiles": [
            "net/tls/tls_sw.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.5"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.5",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
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              "version": "7.1.9",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/tls/tls_sw.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-22T16:16:33.547",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/3c5f8f2aa57c647b83add4896aab64aac5fdedad",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/aa8b14647721b5a4958712b35cf43e3125d47753",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f634289a0b557a197c5f37284b623cefedfe73d5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntls: don't leave a full plaintext sk_msg ring unpushed\n\nWhen the copy path in tls_sw_sendmsg_locked() adds the fragment that fills\nthe plaintext sk_msg ring, it does not set full_record, so the record is\nleft full and unpushed.  A later splice() then adds to an already full\nring: sk_msg_page_add() has no fullness check of its own, so sg.end wraps\nonto sg.start and the ring appears empty.  Fragments added after that\noverwrite live entries, and sg.size no longer matches what is reachable\nbetween sg.start and sg.end, so pushing the record runs the scatterwalk off\nthe end of the scatterlist.\n\nAn unprivileged user can trigger this on a loopback TCP socket with the\n\"tls\" ULP attached:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000008\n  RIP: 0010:memcpy_from_scatterwalk+0x32/0xc0\n  Call Trace:\n   skcipher_walk_next+0x1d1/0x2c0\n   gcm_encrypt_aesni_avx+0x1e9/0x220\n   bpf_exec_tx_verdict+0x3bb/0x860\n   tls_sw_sendmsg+0xa1a/0xca0\n   __sys_sendto+0x1da/0x1f0\n\nSet full_record in the copy path when the ring becomes full, and push a\nrecord that is already full on entry to the sendmsg loop."
    }
  ],
  "lastModified": "2026-08-25T06:18:38.140",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}