FKIE_CVE-2026-74608

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-10-14 13:10
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix use-after-free in cifs_try_adding_channels() cifs_try_adding_channels() takes a temporary reference to an interface before dropping iface_lock. If cifs_ses_add_channel() fails, it drops that reference and then increments iface->weight_fulfilled. A concurrent interface list refresh can remove the list reference while channel creation is in progress. In that case, the failure-path kref_put() releases the last reference and frees iface. Updating weight_fulfilled afterward then accesses freed memory. Increment weight_fulfilled before dropping the temporary reference, keeping iface alive for the final access.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1ffacbadc14530e55b8d86f7b917524f6a0fb891
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/47dfac48bce7198ad4f1a388fc8c9491f878ac3b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4986410316b1ae0e63c6ce418e4eb196723626e7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/64d7584e62ac8cdc750455c5fdc6008fc2de4f06
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c292d4686f717c03e5022fc4ae7c782f39a94915
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/sess.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "64d7584e62ac8cdc750455c5fdc6008fc2de4f06",
              "status": "affected",
              "version": "cbc53148cc0946b72d62a3c53870cb22ce4ec284",
              "versionType": "git"
            },
            {
              "lessThan": "c292d4686f717c03e5022fc4ae7c782f39a94915",
              "status": "affected",
              "version": "cff97d683a083b862a8bb24309e0f4d2d928128a",
              "versionType": "git"
            },
            {
              "lessThan": "47dfac48bce7198ad4f1a388fc8c9491f878ac3b",
              "status": "affected",
              "version": "6aac002bcfd554aff6d3ebb55e1660d078d70ab0",
              "versionType": "git"
            },
            {
              "lessThan": "1ffacbadc14530e55b8d86f7b917524f6a0fb891",
              "status": "affected",
              "version": "6aac002bcfd554aff6d3ebb55e1660d078d70ab0",
              "versionType": "git"
            },
            {
              "lessThan": "1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805",
              "status": "affected",
              "version": "6aac002bcfd554aff6d3ebb55e1660d078d70ab0",
              "versionType": "git"
            },
            {
              "lessThan": "4986410316b1ae0e63c6ce418e4eb196723626e7",
              "status": "affected",
              "version": "6aac002bcfd554aff6d3ebb55e1660d078d70ab0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "22a6c5b3425f327e7f4c3606a72277dce82c7d83",
              "versionType": "git"
            },
            {
              "lessThan": "6.1.183",
              "status": "affected",
              "version": "6.1.78",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6.152",
              "status": "affected",
              "version": "6.6.17",
              "versionType": "semver"
            },
            {
              "lessThan": "6.8",
              "status": "affected",
              "version": "6.7.5",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/sess.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: Fix use-after-free in cifs_try_adding_channels()\n\ncifs_try_adding_channels() takes a temporary reference to an interface\nbefore dropping iface_lock. If cifs_ses_add_channel() fails, it drops\nthat reference and then increments iface-\u003eweight_fulfilled.\n\nA concurrent interface list refresh can remove the list reference while\nchannel creation is in progress. In that case, the failure-path\nkref_put() releases the last reference and frees iface. Updating\nweight_fulfilled afterward then accesses freed memory.\n\nIncrement weight_fulfilled before dropping the temporary reference,\nkeeping iface alive for the final access."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsmb: cliente: Correcci\u00f3n de uso despu\u00e9s de liberaci\u00f3n en cifs_try_adding_channels()\n\ncifs_try_adding_channels() toma una referencia temporal a una interfaz antes de liberar iface_lock. Si cifs_ses_add_channel() falla, libera esa referencia y luego incrementa iface -\u003e weight_fulfilled.\n\nUna actualizaci\u00f3n concurrente de la lista de interfaces puede eliminar la referencia de la lista mientras la creaci\u00f3n del canal est\u00e1 en curso. En ese caso, el kref_put() de la ruta de fallo libera la \u00faltima referencia y libera iface. Actualizar weight_fulfilled despu\u00e9s luego accede a memoria liberada.\n\nIncrementa weight_fulfilled antes de liberar la referencia temporal, manteniendo iface vivo para el acceso final."
    }
  ],
  "id": "CVE-2026-74608",
  "lastModified": "2026-10-14T13:10:00.187",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-22T16:16:33.290",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1ffacbadc14530e55b8d86f7b917524f6a0fb891"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/47dfac48bce7198ad4f1a388fc8c9491f878ac3b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4986410316b1ae0e63c6ce418e4eb196723626e7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/64d7584e62ac8cdc750455c5fdc6008fc2de4f06"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c292d4686f717c03e5022fc4ae7c782f39a94915"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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