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CVE-2026-89609

Estado: RecibidaAlta (7.8)—

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

ecryptfs: hold msg ctx list lock when cleaning daemon queue

ecryptfs_exorcise_daemon() drops queued messages from a dying daemon without holding ecryptfs_msg_ctx_lists_mux, but ecryptfs_msg_ctx_alloc_to_free() requires that lock.

Take the list lock while moving the queued contexts back to the free list to avoid racing with other global msg ctx list users.

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 en kernel Linux (acceso local, PR:L) con impacto en disponibilidad (A:H) por race condition en limpieza de colas; permite DoS por falta de sincronización.

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 ProgramFilter Network TrafficExecution 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)

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{
  "id": "CVE-2026-89609",
  "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": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1",
              "lessThan": "64d8998e36cfd2bb7114f3af0aa51c5a559a39b3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1",
              "lessThan": "4d50b8aea11ad9594c8704a4c647e11311ab7b19",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1",
              "lessThan": "956541efd125a10442f9514668bc5c852702c93b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1",
              "lessThan": "ec1627bcb5b51ddd46b1ef27a9d5a9834abb0a6a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1",
              "lessThan": "7e48afafe7abc275f7b6916613bb18b821e7d94a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1",
              "lessThan": "0d9636ecba34bd553ecf19049f7705505aea62fd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1",
              "lessThan": "4c02acbe0a2692ca9991c51e62bbe6d6b59dac31",
              "versionType": "git"
            },
            {
              "status": "affected",
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              "lessThan": "779972513c2fa8c7938e54976f686091dafff22f",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/ecryptfs/messaging.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.26"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.26",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/ecryptfs/messaging.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-11T20:19:45.983",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0d9636ecba34bd553ecf19049f7705505aea62fd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4c02acbe0a2692ca9991c51e62bbe6d6b59dac31",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4d50b8aea11ad9594c8704a4c647e11311ab7b19",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/64d8998e36cfd2bb7114f3af0aa51c5a559a39b3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/779972513c2fa8c7938e54976f686091dafff22f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7e48afafe7abc275f7b6916613bb18b821e7d94a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/956541efd125a10442f9514668bc5c852702c93b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ec1627bcb5b51ddd46b1ef27a9d5a9834abb0a6a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\necryptfs: hold msg ctx list lock when cleaning daemon queue\n\necryptfs_exorcise_daemon() drops queued messages from a dying daemon\nwithout holding ecryptfs_msg_ctx_lists_mux, but\necryptfs_msg_ctx_alloc_to_free() requires that lock.\n\nTake the list lock while moving the queued contexts back to the free\nlist to avoid racing with other global msg ctx list users."
    }
  ],
  "lastModified": "2026-09-14T13:19:15.237",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}