tty: vcc: hold port lock when clearing tty pointer in vcc_cleanup

{
  "id": "6e0ce4691e4117d68c49a16033f3df78fa45875068c25fa4fbb69279a1868c9f",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-98754",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tty: vcc: hold port lock when clearing tty pointer in vcc_cleanup",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: tty: vcc: hold port lock when clearing tty pointer in vcc_cleanup vcc_cleanup() sets port->tty to NULL without holding port->lock, racing with vcc_event() LDC callbacks that read port->tty under port->lock and then use tty->port. This can cause a use-after-free when the callback dereferences tty->port after cleanup has already destroyed and freed it.",
    "evidence": "cve:CVE-2026-98754",
    "products": [
      {
        "name": {
          "value": "Linux",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "Linux",
          "evidence": "/containers/cna/affected/1/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98754",
      "aliases": [
        "CVE-2026-98754"
      ],
      "metrics": [],
      "affected": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb",
              "lessThan": "57753441ef84bee3bf0e9ee1e3778d119c44aa32",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb",
              "lessThan": "88f6ecb058801e9ce7b9aabc966530118d7cd53c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb",
              "lessThan": "821050631750e982007c0856c119346edba51cae",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb",
              "lessThan": "1a9fb9eaeb69b1f6c00bed09289a33d9fe1e7ae4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8f03f948ba356b7cb254b45a4e78b5b3d86fd3bb",
              "lessThan": "03b49c991abb8d021ca6fe51cd173447236b0552",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/tty/vcc.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.14"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.14",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/tty/vcc.c"
          ],
          "defaultStatus": "affected"
        }
      ],
      "modified": "2026-10-26T06:55:48.861Z",
      "provider": "cve",
      "references": [
        "https://git.kernel.org/stable/c/57753441ef84bee3bf0e9ee1e3778d119c44aa32",
        "https://git.kernel.org/stable/c/88f6ecb058801e9ce7b9aabc966530118d7cd53c",
        "https://git.kernel.org/stable/c/821050631750e982007c0856c119346edba51cae",
        "https://git.kernel.org/stable/c/1a9fb9eaeb69b1f6c00bed09289a33d9fe1e7ae4",
        "https://git.kernel.org/stable/c/03b49c991abb8d021ca6fe51cd173447236b0552"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "shortName": "Linux",
          "dateUpdated": "2026-10-26T06:55:48.861Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98754",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-cve",
  "document_id": 263326,
  "published_at": "2026-10-18T15:47:40.255+00:00"
}