{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9"
            },
            {
              "fixed": "16fb65ec15fe7c90f50a2115854bfd9a032d4023"
            },
            {
              "fixed": "282847c0cf22f2e961155ac8e42f6eeab7e16049"
            },
            {
              "fixed": "d020e7f27bf65eecd3805404702f716b2b6d9e73"
            },
            {
              "fixed": "15a9e9b8f7f5d7f380ae54c6f5bcbc0bdcb0f3cd"
            },
            {
              "fixed": "60908f7ebcd9b6cde74ad5711fab0f49c7970949"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.15.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72382.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: reject undersized DACLs before parsing ACEs\n\nparse_dacl() limits the attacker-controlled ACE count by comparing it\nwith the number of minimal ACEs that fit in the DACL size. The DACL size\nfield is 16 bits, but the expression subtracts sizeof(struct smb_acl).\nBecause sizeof() is unsigned, a DACL size smaller than the ACL header\nunderflows to a large size_t.\n\nA malicious client can reach this with:\n\nSMB2_SET_INFO (InfoType=SMB2_O_INFO_SECURITY)\n  -\u003e smb2_set_info_sec()\n  -\u003e set_info_sec()\n  -\u003e parse_sec_desc()\n  -\u003e parse_dacl()\n     -\u003e init_acl_state(..., 0xffff)\n     -\u003e init_acl_state(..., 0xffff)\n     -\u003e kmalloc_objs(..., 0xffff)\n\nThus a malformed security descriptor can make num_aces pass the guard\nand drive large temporary ACL state and pointer-array allocations.\n\nReject DACLs smaller than struct smb_acl before doing the subtraction,\nso the ACE count check cannot be bypassed by the underflow.",
  "id": "CVE-2026-72382",
  "modified": "2026-08-16T03:31:04.572467076Z",
  "published": "2026-08-15T05:56:14.103Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15a9e9b8f7f5d7f380ae54c6f5bcbc0bdcb0f3cd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16fb65ec15fe7c90f50a2115854bfd9a032d4023"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/282847c0cf22f2e961155ac8e42f6eeab7e16049"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/60908f7ebcd9b6cde74ad5711fab0f49c7970949"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d020e7f27bf65eecd3805404702f716b2b6d9e73"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72382.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72382"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "ksmbd: reject undersized DACLs before parsing ACEs"
}