ksmbd: preserve VFS inherited POSIX ACL mask

{
  "id": "c70f657a5942f3e71023b9c1b506b72f023f655ff4ad02968b0d0b55bb406a1c",
  "url": "https://osv.dev/vulnerability/CVE-2026-93786",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ksmbd: preserve VFS inherited POSIX ACL mask",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ksmbd: preserve VFS inherited POSIX ACL mask The VFS initializes a child's POSIX ACL from the parent's default ACL and the requested creation mode. Do not mutate the parent ACL or overwrite the child's VFS-computed access and default ACLs afterwards. This preserves restrictive ACL_MASK entries and prevents SMB object creation from widening effective permissions.",
    "evidence": "osv:CVE-2026-93786",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.191",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.158",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.111",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.53",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-93786",
      "aliases": [
        "CVE-2026-93786"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f44158485826c076335d6860d35872271a83791d"
                },
                {
                  "fixed": "8493da704275ca5ab67fb88c0ae7b71576e91951"
                },
                {
                  "fixed": "4a19bb1c45667f5a5f6eff9cf6648e0f692d046f"
                },
                {
                  "fixed": "591acf171644de590cda245fd8595b473a1beb70"
                },
                {
                  "fixed": "0093909becbda22b62b39b654dbc607faed59cd0"
                },
                {
                  "fixed": "e148e567a9252643baa125cb65d7ae9c2c6cf68a"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93786.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.15.0"
                },
                {
                  "fixed": "6.1.191"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.158"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.111"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.53"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93786.json"
          }
        }
      ],
      "modified": "2026-11-01T02:30:58.105867039Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0093909becbda22b62b39b654dbc607faed59cd0",
        "https://git.kernel.org/stable/c/4a19bb1c45667f5a5f6eff9cf6648e0f692d046f",
        "https://git.kernel.org/stable/c/591acf171644de590cda245fd8595b473a1beb70",
        "https://git.kernel.org/stable/c/8493da704275ca5ab67fb88c0ae7b71576e91951",
        "https://git.kernel.org/stable/c/e148e567a9252643baa125cb65d7ae9c2c6cf68a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93786.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-93786",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93786.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-93786",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 489833,
  "published_at": "2026-09-24T16:02:19.798+00:00"
}