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CVE-2026-74344

Estado: RecibidaAlta (7.8)—

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

bpf: Clear rb node linkage when freeing bpf_rb_root

bpf_rb_root_free() detaches the root by copying the current rb_root_cached and then replacing the live root with RB_ROOT_CACHED. It then walks the copied root and drops each object contained in the tree.

This leaves the rb node state intact while dropping the object. If the object is refcounted and survives the drop, its bpf_rb_node_kern still contains an owner pointer to the freed root and stale rb tree linkage. If a later bpf_rb_root allocation reuses the same address, bpf_rbtree_remove() can incorrectly pass the owner check and call rb_erase_cached() on a node whose rb pointers belong to the old tree.

Leer descripción completaMostrar menos

Mirror the list draining behavior by marking nodes as busy while the root is being detached, then clear the rb node and release the owner before dropping the containing object. This makes surviving nodes unowned and safe to reject from remove or accept for a later add.

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 de kernel (AV:L, PR:L) que permite escalada mediante manipulación de estructuras de datos RB-tree; puede lograr ejecución de código o corrupción de datos con privilegios elevados.

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 ProgramRestrict File and Directory PermissionsRemote Data StorageExecution PreventionEncrypt Sensitive InformationApplication 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-2026-74344",
  "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": "9c395c1b99bd23f74bc628fa000480c49593d17f",
              "lessThan": "2eb39de4962f842d653e96818ae372665cd481fd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9c395c1b99bd23f74bc628fa000480c49593d17f",
              "lessThan": "574612793bed416f6c05fe7c9b50e9eb0441997e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9c395c1b99bd23f74bc628fa000480c49593d17f",
              "lessThan": "4a7910ee060d8ce55612f5b3cc267f3a265a3cec",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1d0675957d35ac5e514073481beda62e4e1e2ec5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.2.15",
              "lessThan": "6.3",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "kernel/bpf/helpers.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.3",
              "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": [
            "kernel/bpf/helpers.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:22:35.487",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/2eb39de4962f842d653e96818ae372665cd481fd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4a7910ee060d8ce55612f5b3cc267f3a265a3cec",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/574612793bed416f6c05fe7c9b50e9eb0441997e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Clear rb node linkage when freeing bpf_rb_root\n\nbpf_rb_root_free() detaches the root by copying the current rb_root_cached\nand then replacing the live root with RB_ROOT_CACHED. It then walks the\ncopied root and drops each object contained in the tree.\n\nThis leaves the rb node state intact while dropping the object. If the\nobject is refcounted and survives the drop, its bpf_rb_node_kern still\ncontains an owner pointer to the freed root and stale rb tree linkage. If\na later bpf_rb_root allocation reuses the same address, bpf_rbtree_remove()\ncan incorrectly pass the owner check and call rb_erase_cached() on a node\nwhose rb pointers belong to the old tree.\n\nMirror the list draining behavior by marking nodes as busy while the root\nis being detached, then clear the rb node and release the owner before\ndropping the containing object. This makes surviving nodes unowned and\nsafe to reject from remove or accept for a later add."
    }
  ],
  "lastModified": "2026-08-17T06:19:28.960",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}