« Volver al listado

CVE-2026-43211

Estado: AnalizadaAlta (7.8)—

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

PCI: Fix pci_slot_trylock() error handling

Commit a4e772898f8b ("PCI: Add missing bridge lock to pci_bus_lock()") delegates the bridge device's pci_dev_trylock() to pci_bus_trylock() in pci_slot_trylock(), but it forgets to remove the corresponding pci_dev_unlock() when pci_bus_trylock() fails.

Before a4e772898f8b, the code did:

After a4e772898f8b the bridge-device lock is no longer taken, but the pci_dev_unlock(dev) on the failure path was left in place, leading to the bug.

This yields one of two errors:

Fix it by removing the now-redundant pci_dev_unlock(dev) on the failure path.

Leer descripción completaMostrar menos

[Same patch later posted by Keith at https://patch.msgid.link/20260116184150.3013258-1-kbusch@meta.com]

Detalles técnicos trazas, registros y código del informe original
  if (!pci_dev_trylock(dev)) /* <- lock bridge device */
    goto unlock;
  if (dev->subordinate) {
    if (!pci_bus_trylock(dev->subordinate)) {
      pci_dev_unlock(dev);   /* <- unlock bridge device */
      goto unlock;
    }
  }

  1. A warning that the lock is being unlocked when no one holds it.
  2. An incorrect unlock of a lock that belongs to another thread.

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) causada por manejo incorrecto de locks que permite a un usuario local causar DoS o corrupción de memoria; acceso local sin interacción (T1068) con impacto de denegación de servicio y manipulación de datos del sistema de archivos.

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)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-43211",
  "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": "e2355d513b89a2cb511b4ded0deb426cdb01acd0",
              "lessThan": "ebb27b7399ab8b9eb1f792b329aa5f6250c590d4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "04e85a3285b0e5c5af6fd2c0fd6e95ffecc01945",
              "lessThan": "fbe06a3058114bf95a17a4941b205f4b321c6f0a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7253b4fed46471cc247c6cacefac890a8472c083",
              "lessThan": "943ed56606a7ab2fe5a99cad572dd17d484310c7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "78c6e39fef5c428960aff742149bba302dd46f5a",
              "lessThan": "a19b61fdb958ffadbba85b43c991eb9fc70c1c1c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a4e772898f8bf2e7e1cf661a12c60a5612c4afab",
              "lessThan": "0425aaf20b407d2f2cf3bf469808e4a35f9abb8b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a4e772898f8bf2e7e1cf661a12c60a5612c4afab",
              "lessThan": "bd435f4b738130d732ef64e0e57e45185f77165d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a4e772898f8bf2e7e1cf661a12c60a5612c4afab",
              "lessThan": "8b08ea9690b212b7bf7f12414039259cf34b1aa0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a4e772898f8bf2e7e1cf661a12c60a5612c4afab",
              "lessThan": "9368d1ee62829b08aa31836b3ca003803caf0b72",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0790b89c7e911003b8c50ae50e3ac7645de1fae9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "df77a678c33871a6e4ac5b54a71662f1d702335b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "81c68e218ab883dfa368460a59b674084c0240da",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5.10.226",
              "lessThan": "5.10.252",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "5.15.167",
              "lessThan": "5.15.202",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.1.110",
              "lessThan": "6.1.165",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.6.51",
              "lessThan": "6.6.128",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "4.19.322",
              "lessThan": "4.20",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "5.4.284",
              "lessThan": "5.5",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.10.10",
              "lessThan": "6.11",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "drivers/pci/pci.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.11",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.252",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.202",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "6.19.6",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/pci/pci.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-05-06T12:16:40.527",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0425aaf20b407d2f2cf3bf469808e4a35f9abb8b",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8b08ea9690b212b7bf7f12414039259cf34b1aa0",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9368d1ee62829b08aa31836b3ca003803caf0b72",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/943ed56606a7ab2fe5a99cad572dd17d484310c7",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a19b61fdb958ffadbba85b43c991eb9fc70c1c1c",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bd435f4b738130d732ef64e0e57e45185f77165d",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ebb27b7399ab8b9eb1f792b329aa5f6250c590d4",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fbe06a3058114bf95a17a4941b205f4b321c6f0a",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-667"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: Fix pci_slot_trylock() error handling\n\nCommit a4e772898f8b (\"PCI: Add missing bridge lock to pci_bus_lock()\")\ndelegates the bridge device's pci_dev_trylock() to pci_bus_trylock() in\npci_slot_trylock(), but it forgets to remove the corresponding\npci_dev_unlock() when pci_bus_trylock() fails.\n\nBefore a4e772898f8b, the code did:\n\n  if (!pci_dev_trylock(dev)) /* <- lock bridge device */\n    goto unlock;\n  if (dev->subordinate) {\n    if (!pci_bus_trylock(dev->subordinate)) {\n      pci_dev_unlock(dev);   /* <- unlock bridge device */\n      goto unlock;\n    }\n  }\n\nAfter a4e772898f8b the bridge-device lock is no longer taken, but the\npci_dev_unlock(dev) on the failure path was left in place, leading to the\nbug.\n\nThis yields one of two errors:\n\n  1. A warning that the lock is being unlocked when no one holds it.\n  2. An incorrect unlock of a lock that belongs to another thread.\n\nFix it by removing the now-redundant pci_dev_unlock(dev) on the failure\npath.\n\n[Same patch later posted by Keith at\nhttps://patch.msgid.link/20260116184150.3013258-1-kbusch@meta.com]"
    }
  ],
  "lastModified": "2026-06-17T10:49:09.683",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A3FCD7A0-ABE5-49E8-A47C-F0169215C4B7",
              "versionEndExcluding": "4.20",
              "versionStartIncluding": "4.19.322"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "69E2B19B-E681-4963-ABD2-D4141E9A6B64",
              "versionEndExcluding": "5.5",
              "versionStartIncluding": "5.4.284"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "46ED7BB3-F580-4BF5-AF52-3D115F1A672E",
              "versionEndExcluding": "5.10.252",
              "versionStartIncluding": "5.10.226"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CA8574EF-E0E5-423A-A5D7-CEDCF7FDEB8C",
              "versionEndExcluding": "5.15.202",
              "versionStartIncluding": "5.15.167"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D575C1E8-668C-41F9-8A8F-30FDF5C45F1A",
              "versionEndExcluding": "6.1.165",
              "versionStartIncluding": "6.1.110"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E939C709-7387-4CDF-B846-AD633A16F152",
              "versionEndExcluding": "6.6.128",
              "versionStartIncluding": "6.6.51"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FF19907D-B1E9-49EB-8A88-5F3EF276ADDE",
              "versionEndExcluding": "6.12.75",
              "versionStartIncluding": "6.10.10"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B",
              "versionEndExcluding": "6.18.16",
              "versionStartIncluding": "6.13"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67",
              "versionEndExcluding": "6.19.6",
              "versionStartIncluding": "6.19"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}