CVE-2026-63800

Estado: AnalizadaCrítica (9.8)—

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

pNFS: Fix use-after-free in pnfs_update_layout()

When hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(), the code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds, pnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(), which still references 'lo'. This results in a use-after-free when the tracepoint accesses lo's fields.

Fix this by moving the tracepoint call before pnfs_put_layout_hdr(lo).

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 9.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.53%
Percentil entre todas las CVEs puntuadas: 43
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.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access75 %

CVE-2026-63800 es una vulnerabilidad use-after-free (CWE-416) en el kernel de Linux accesible remotamente (AV:N, PR:N, UI:N). Aunque es un defecto de memoria, la criticidad CVSS y el acceso remoto sin privilegios sugieren explotabilidad para ejecución remota (T1190). El impacto potencial es ejecució

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

Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Filter Network Traffic Application Isolation and Sandboxing

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-416

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-63800",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "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": "06f58dbc49a23c99e5c0f246879ed16667f7bf8f",
              "lessThan": "4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "lessThan": "1f24b8302c77dcaf79c64c073877a3b9f4dd25d2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "lessThan": "9c0fb5c09ae5bd68dc0038692af8127029cb0385",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "lessThan": "7e37e9b3e82ade881e1798e2f4fcc54aff7793c1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "lessThan": "2883ddd7542b4437a2ab4908fe2773f690e20889",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "lessThan": "200e7637f4d6a1342987045eea72641524f909dc",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "lessThan": "9645aaf689aff57427ece3b9fa47d5b5399417f4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2c8d5fc37fe2384a9bdb6965443ab9224d46f704",
              "lessThan": "13e198a90ca4050f4bee8a3f23680389a6563ccc",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aa2399f55eff4ec78330bb6fe55f9df53e5cae0c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5.10.9",
              "lessThan": "5.10.260",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "5.4.91",
              "lessThan": "5.5",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "fs/nfs/pnfs.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.11"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.11",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.260",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.211",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.177",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.144",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.95",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.38",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.3",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/nfs/pnfs.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-07-19T12:16:52.553",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npNFS: Fix use-after-free in pnfs_update_layout()\n\nWhen hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(),\nthe code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds,\npnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(),\nwhich still references 'lo'. This results in a use-after-free when the\ntracepoint accesses lo's fields.\n\nFix this by moving the tracepoint call before pnfs_put_layout_hdr(lo)."
    }
  ],
  "lastModified": "2026-08-17T05:17:16.393",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1FDC12D0-2C56-4F4C-9EBF-45DCF5316E5D",
              "versionEndExcluding": "5.5",
              "versionStartIncluding": "5.4.91"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7257F51A-BFB1-4EFF-8AB1-DEEF700EF3D5",
              "versionEndExcluding": "5.10.260",
              "versionStartIncluding": "5.10.9"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "655F31B9-4770-4EFA-8C26-7508934F4CDF",
              "versionEndExcluding": "5.15.211",
              "versionStartIncluding": "5.11.1"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "333C9E30-7FD4-46A2-94EF-C1AA1F3EE28B",
              "versionEndExcluding": "6.1.177",
              "versionStartIncluding": "5.16"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C8AD3BC8-C843-423C-B9DB-CB52F67F578E",
              "versionEndExcluding": "6.6.144",
              "versionStartIncluding": "6.2"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4E206B86-E0E3-4394-A93F-39F2D50A8AA8",
              "versionEndExcluding": "6.12.95",
              "versionStartIncluding": "6.7"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FA591B28-5D62-449E-BDBE-3C9391BF070A",
              "versionEndExcluding": "6.18.38",
              "versionStartIncluding": "6.13"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9526B150-E2B3-4C6F-8AE5-1AF92B75AD9E",
              "versionEndExcluding": "7.1.3",
              "versionStartIncluding": "6.19"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.11:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7AD3510E-E8FA-47F3-9AD5-D8EA4A2719D1"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.11:rc4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A330B043-47EA-4D06-82BF-153A1735FC11"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.11:rc5:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F0EE963C-B36C-4143-96A9-65BCA7D8F2EF"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.11:rc6:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B511E2F6-2917-4797-8909-8F7EA4870C7B"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.11:rc7:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E9FA9D80-C790-41EA-8A21-DF7B170465E0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}