FKIE_CVE-2026-53397

Vulnerability from fkie_nvd - Published: 2026-07-19 12:16 - Updated: 2026-07-20 15:16
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix posix_acl leak on SETACL decode failure nfsaclsvc_decode_setaclargs() and nfs3svc_decode_setaclargs() each call nfs_stream_decode_acl() twice, first for NFS_ACL and then for NFS_DFACL. Each successful call transfers ownership of a freshly allocated posix_acl into argp->acl_access or argp->acl_default. If the first call succeeds but the second fails, the decoder returns false and argp->acl_access is left dangling. ACLPROC2_SETACL.pc_release was wired to nfssvc_release_attrstat and ACLPROC3_SETACL.pc_release was wired to nfs3svc_release_fhandle. Both only call fh_put() and have no knowledge of the ACL fields on argp. The posix_acl_release() pairs sat at the out: labels inside nfsacld_proc_setacl() and nfsd3_proc_setacl(), but svc_process() skips pc_func when pc_decode returns false, so that cleanup is unreachable on decode failure: svc_process_common() pc_decode() /* decode_setaclargs: false */ /* pc_func skipped */ pc_release() /* fh_put only -- ACLs leaked */ The orphaned posix_acl is leaked for the lifetime of the server. Fix by adding nfsaclsvc_release_setacl() and nfs3svc_release_setacl(), which release both argp->acl_access and argp->acl_default in addition to fh_put(), and wiring them as pc_release for their respective SETACL procedures. pc_release runs on every path svc_process() takes after decode, including decode failure, so the posix_acl_release() pairs are removed from the proc functions' out: labels to keep ownership in one place. This matches the existing release_getacl() pattern used by the sibling GETACL procedures.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0853ac544c590880d797b04daa33fcb72b6be0e1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/136b416593f1349cf6f72c8e3d18f0f204ee8545
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1e96239fddcefacf6afe6c498357be68eacbcabc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/887f92ceccf3eacd5f2402db21254d66372fae00
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a5b42c1e4ff2befaa6b96f7cbf32174751eba083
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b2eb1ffd511d1b3c3e21122f97cbbccea411e277
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b94c4be77682aab06d65ca7296149e3bcfb37353
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bd69a825485168ef74e815ecb286754b570fdcc7
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfs2acl.c",
            "fs/nfsd/nfs3acl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b2eb1ffd511d1b3c3e21122f97cbbccea411e277",
              "status": "affected",
              "version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
              "versionType": "git"
            },
            {
              "lessThan": "b94c4be77682aab06d65ca7296149e3bcfb37353",
              "status": "affected",
              "version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
              "versionType": "git"
            },
            {
              "lessThan": "887f92ceccf3eacd5f2402db21254d66372fae00",
              "status": "affected",
              "version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
              "versionType": "git"
            },
            {
              "lessThan": "1e96239fddcefacf6afe6c498357be68eacbcabc",
              "status": "affected",
              "version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
              "versionType": "git"
            },
            {
              "lessThan": "bd69a825485168ef74e815ecb286754b570fdcc7",
              "status": "affected",
              "version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
              "versionType": "git"
            },
            {
              "lessThan": "136b416593f1349cf6f72c8e3d18f0f204ee8545",
              "status": "affected",
              "version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
              "versionType": "git"
            },
            {
              "lessThan": "a5b42c1e4ff2befaa6b96f7cbf32174751eba083",
              "status": "affected",
              "version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
              "versionType": "git"
            },
            {
              "lessThan": "0853ac544c590880d797b04daa33fcb72b6be0e1",
              "status": "affected",
              "version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfs2acl.c",
            "fs/nfsd/nfs3acl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.13"
            },
            {
              "lessThan": "2.6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.260",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.211",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.177",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.144",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.95",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.38",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027 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",
  "lastModified": "2026-07-20T15:16:42.257",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-19T12:16:50.793",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0853ac544c590880d797b04daa33fcb72b6be0e1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/136b416593f1349cf6f72c8e3d18f0f204ee8545"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1e96239fddcefacf6afe6c498357be68eacbcabc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/887f92ceccf3eacd5f2402db21254d66372fae00"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a5b42c1e4ff2befaa6b96f7cbf32174751eba083"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b2eb1ffd511d1b3c3e21122f97cbbccea411e277"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b94c4be77682aab06d65ca7296149e3bcfb37353"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bd69a825485168ef74e815ecb286754b570fdcc7"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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