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CVE-2026-74425

Estado: RecibidaAlta (7.5)—

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

afs: handle CB.InitCallBackState3 requests without a server record

The cache manager callback path now attaches the server record to an incoming call through the rxrpc peer's app data. That association is not guaranteed to exist for every callback request, and most callback handlers already tolerate that case.

Make CB.InitCallBackState3 follow the same pattern by checking whether a server record was attached before using it. If the peer is not mapped to a server record, trace the request and ignore it, matching the existing behaviour for other unmatched callback requests.

Leer descripción completaMostrar menos

This keeps the callback handler consistent with the rest of the cache manager service and avoids depending on peer state that may not be available for a given request.

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.

Inferido por reglas deterministas a partir del vector CVSS y la CWE. Solo orientativo.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

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-2026-74425",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "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": "39ba6af83a7f9dee3e6a7916f41a48bcbda54eba",
              "lessThan": "42e3917cdbdc3d35e191c525687a6d5427f237fd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "40e8b52fe8c8ab6920ea5f59c5469b6918cce624",
              "lessThan": "cc848a080f7a6848dfeef441722419fdcbfe9b8d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "40e8b52fe8c8ab6920ea5f59c5469b6918cce624",
              "lessThan": "0bd5f2786a878148190b4c7c259d01313d5f2357",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "40e8b52fe8c8ab6920ea5f59c5469b6918cce624",
              "lessThan": "f3cf725cd284b7912d5522babb44721bf38c8887",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/afs/cmservice.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.15",
              "versionType": "semver"
            },
            {
              "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": [
            "fs/afs/cmservice.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:22:44.590",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0bd5f2786a878148190b4c7c259d01313d5f2357",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/42e3917cdbdc3d35e191c525687a6d5427f237fd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cc848a080f7a6848dfeef441722419fdcbfe9b8d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f3cf725cd284b7912d5522babb44721bf38c8887",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: handle CB.InitCallBackState3 requests without a server record\n\nThe cache manager callback path now attaches the server record to an\nincoming call through the rxrpc peer's app data.  That association is\nnot guaranteed to exist for every callback request, and most callback\nhandlers already tolerate that case.\n\nMake CB.InitCallBackState3 follow the same pattern by checking whether a\nserver record was attached before using it.  If the peer is not mapped\nto a server record, trace the request and ignore it, matching the\nexisting behaviour for other unmatched callback requests.\n\nThis keeps the callback handler consistent with the rest of the cache\nmanager service and avoids depending on peer state that may not be\navailable for a given request."
    }
  ],
  "lastModified": "2026-08-17T06:19:37.997",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}