{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e2f8fbfb8d09c06decde162090fac3ee220aa280"
            },
            {
              "fixed": "23b54d6cc3ef30a51d984dc74364f24039ae2ecb"
            },
            {
              "fixed": "1592a6cd6f653f2d24572a6976c7a775b19f4940"
            },
            {
              "fixed": "8bd4cad3f458d11650d51c2d24b03fb1770ae6cc"
            },
            {
              "fixed": "b53b8e98c23310294fc45fc686db5ee860311896"
            },
            {
              "fixed": "c8eef12af1cc73031639ea7cf16e0b10e2536b0b"
            },
            {
              "fixed": "38a69f08ee82c450d3e4168707fff2e317dc3ff7"
            },
            {
              "fixed": "f8488c07bea2431ee12a6067d736578064fa46b4"
            },
            {
              "fixed": "2757ad3e4b6f9e0fed4c7739594e702abc5cab21"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.4.0"
            },
            {
              "fixed": "5.10.259"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.136"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.84"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.25"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43350.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: require a full NFS mode SID before reading mode bits\n\nparse_dacl() treats an ACE SID matching sid_unix_NFS_mode as an NFS\nmode SID and reads sid.sub_auth[2] to recover the mode bits.\n\nThat assumes the ACE carries three subauthorities, but compare_sids()\nonly compares min(a, b) subauthorities.  A malicious server can return\nan ACE with num_subauth = 2 and sub_auth[] = {88, 3}, which still\nmatches sid_unix_NFS_mode and then drives the sub_auth[2] read four\nbytes past the end of the ACE.\n\nRequire num_subauth \u003e= 3 before treating the ACE as an NFS mode SID.\nThis keeps the fix local to the special-SID mode path without changing\ncompare_sids() semantics for the rest of cifsacl.",
  "id": "CVE-2026-43350",
  "modified": "2026-07-08T05:37:27.176333711Z",
  "published": "2026-05-08T13:41:53.276Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1592a6cd6f653f2d24572a6976c7a775b19f4940"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/23b54d6cc3ef30a51d984dc74364f24039ae2ecb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2757ad3e4b6f9e0fed4c7739594e702abc5cab21"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/38a69f08ee82c450d3e4168707fff2e317dc3ff7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8bd4cad3f458d11650d51c2d24b03fb1770ae6cc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b53b8e98c23310294fc45fc686db5ee860311896"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c8eef12af1cc73031639ea7cf16e0b10e2536b0b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f8488c07bea2431ee12a6067d736578064fa46b4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43350.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43350"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "smb: client: require a full NFS mode SID before reading mode bits"
}