{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  nfsd: gate nfs3 setacl by argp-\u003emask  nfsd3_proc_setacl() calls set_posix_acl() unconditionally for both ACL_TYPE_ACCESS and ACL_TYPE_DEFAULT, passing argp-\u003eacl_access and argp-\u003eacl_default verbatim. The NFSv3 ACL decoder only populates those pointers when the corresponding mask bit is set:      nfs3svc_decode_setaclargs()       if (args-\u003emask \u0026 NFS_ACL)    decode into acl_access       if (args-\u003emask \u0026 NFS_DFACL)  decode into acl_default       /* otherwise the pointer stays NULL (pc_argzero) */      nfsd3_proc_setacl()       set_posix_acl(.., ACL_TYPE_ACCESS,  argp-\u003eacl_access)       set_posix_acl(.., ACL_TYPE_DEFAULT, argp-\u003eacl_default)  set_posix_acl(idmap, dentry, type, NULL) is the VFS \"remove this ACL type\" operation. A NULL pointer that means \"the client did not send this arm\" is therefore indistinguishable from \"the client asked to remove this ACL\". A SETACL with mask=NFS_ACL silently drops the directory's default ACL; mask=0 drops both.  The sibling nfsd3_proc_getacl() already consults argp-\u003emask before touching each arm; mirror that in setacl.  Fix by wrapping each set_posix_acl() call in the matching mask bit check and initializing error to 0 before inode_lock so that a request with neither bit set leaves the on-disk ACLs untouched and returns nfs_ok. The out_drop_lock path and the unconditional posix_acl_release() at out: are preserved; both NULL-tolerate the skipped arms.",
  "id": "DEBIAN-CVE-2026-89671",
  "modified": "2026-09-15T08:47:26.680955908Z",
  "published": "2026-09-11T20:19:53.647Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-89671"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-89671"
  ]
}