{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055"
            },
            {
              "fixed": "b2eb1ffd511d1b3c3e21122f97cbbccea411e277"
            },
            {
              "fixed": "b94c4be77682aab06d65ca7296149e3bcfb37353"
            },
            {
              "fixed": "887f92ceccf3eacd5f2402db21254d66372fae00"
            },
            {
              "fixed": "1e96239fddcefacf6afe6c498357be68eacbcabc"
            },
            {
              "fixed": "bd69a825485168ef74e815ecb286754b570fdcc7"
            },
            {
              "fixed": "136b416593f1349cf6f72c8e3d18f0f204ee8545"
            },
            {
              "fixed": "a5b42c1e4ff2befaa6b96f7cbf32174751eba083"
            },
            {
              "fixed": "0853ac544c590880d797b04daa33fcb72b6be0e1"
            }
          ],
          "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": "5.10.260"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.211"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.177"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.144"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.95"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.38"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53397.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix posix_acl leak on SETACL decode failure\n\nnfsaclsvc_decode_setaclargs() and nfs3svc_decode_setaclargs() each\ncall nfs_stream_decode_acl() twice, first for NFS_ACL and then for\nNFS_DFACL.  Each successful call transfers ownership of a freshly\nallocated posix_acl into argp-\u003eacl_access or argp-\u003eacl_default.  If\nthe first call succeeds but the second fails, the decoder returns\nfalse and argp-\u003eacl_access is left dangling.\n\nACLPROC2_SETACL.pc_release was wired to nfssvc_release_attrstat and\nACLPROC3_SETACL.pc_release was wired to nfs3svc_release_fhandle.\nBoth only call fh_put() and have no knowledge of the ACL fields on\nargp.  The posix_acl_release() pairs sat at the out: labels inside\nnfsacld_proc_setacl() and nfsd3_proc_setacl(), but svc_process()\nskips pc_func when pc_decode returns false, so that cleanup is\nunreachable on decode failure:\n\n    svc_process_common()\n      pc_decode()                  /* decode_setaclargs: false */\n      /* pc_func skipped */\n      pc_release()                 /* fh_put only -- ACLs leaked */\n\nThe orphaned posix_acl is leaked for the lifetime of the server.\n\nFix by adding nfsaclsvc_release_setacl() and nfs3svc_release_setacl(),\nwhich release both argp-\u003eacl_access and argp-\u003eacl_default in addition\nto fh_put(), and wiring them as pc_release for their respective SETACL\nprocedures.  pc_release runs on every path svc_process() takes after\ndecode, including decode failure, so the posix_acl_release() pairs are\nremoved from the proc functions' out: labels to keep ownership in one\nplace.  This matches the existing release_getacl() pattern used by\nthe sibling GETACL procedures.",
  "id": "CVE-2026-53397",
  "modified": "2026-07-22T05:29:59.854161764Z",
  "published": "2026-07-19T12:01:58.938Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0853ac544c590880d797b04daa33fcb72b6be0e1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/136b416593f1349cf6f72c8e3d18f0f204ee8545"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1e96239fddcefacf6afe6c498357be68eacbcabc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/887f92ceccf3eacd5f2402db21254d66372fae00"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a5b42c1e4ff2befaa6b96f7cbf32174751eba083"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b2eb1ffd511d1b3c3e21122f97cbbccea411e277"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b94c4be77682aab06d65ca7296149e3bcfb37353"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bd69a825485168ef74e815ecb286754b570fdcc7"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53397.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53397"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "nfsd: fix posix_acl leak on SETACL decode failure"
}