{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055"
            },
            {
              "fixed": "8e4422b05f410f95c51b68a0db4bf1d87f6d22f5"
            },
            {
              "fixed": "e41d173d9dc735cecb15ab7aa63ecab09338f81b"
            },
            {
              "fixed": "f951b22dbeec46f2e0fba81cb80d1b0c686b61eb"
            },
            {
              "fixed": "37eea38e7898538f0ec5f1eb8b18d8646e4be41c"
            },
            {
              "fixed": "a3a7e20ed66d3f04d37883c398da8a113b430769"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.13"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.109"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89672.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: gate nfs2 setacl by argp-\u003emask\n\nThe NFSACL v2 SETACL path shares the decoder convention used by its\nv3 sibling: nfsaclsvc_decode_setaclargs() fills in argp-\u003eacl_access\nonly when NFS_ACL is set in the request mask and argp-\u003eacl_default\nonly when NFS_DFACL is set, leaving the other pointer NULL because\nthe argument buffer is zeroed up to pc_argzero before decode.\n\nnfsacld_proc_setacl() then hands both pointers to set_posix_acl()\nunconditionally. set_posix_acl(idmap, dentry, type, NULL) is the VFS\n\"remove this ACL type\" operation, so an omitted arm is\nindistinguishable from an explicit request to delete that ACL. A\nSETACL carrying only NFS_ACL silently strips the directory's default\nACL; mask=0 strips both.\n\nThis is the same defect just fixed in nfsd3_proc_setacl(); apply the\nsame remedy. Gate each set_posix_acl() call on its mask bit and\ninitialize error to 0 so that a request with neither bit set leaves\nthe on-disk ACLs untouched and returns success. The out_drop_lock\npath and the unconditional posix_acl_release() in\nnfsaclsvc_release_setacl() already tolerate the skipped arms.",
  "id": "CVE-2026-89672",
  "modified": "2026-09-15T03:30:45.803805801Z",
  "published": "2026-09-11T19:45:57.414Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/37eea38e7898538f0ec5f1eb8b18d8646e4be41c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e4422b05f410f95c51b68a0db4bf1d87f6d22f5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3a7e20ed66d3f04d37883c398da8a113b430769"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e41d173d9dc735cecb15ab7aa63ecab09338f81b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f951b22dbeec46f2e0fba81cb80d1b0c686b61eb"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89672.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89672"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "nfsd: gate nfs2 setacl by argp-\u003emask"
}