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CVE-2026-53397 (GCVE-0-2026-53397)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:01 – Updated: 2026-08-17 04:50
VLAI
Title
nfsd: fix posix_acl leak on SETACL decode failure
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a257cdd0e2179630d3201c32ba14d7fcb3c3a055 , < b2eb1ffd511d1b3c3e21122f97cbbccea411e277 (git)
Affected: a257cdd0e2179630d3201c32ba14d7fcb3c3a055 , < b94c4be77682aab06d65ca7296149e3bcfb37353 (git)
Affected: a257cdd0e2179630d3201c32ba14d7fcb3c3a055 , < 887f92ceccf3eacd5f2402db21254d66372fae00 (git)
Affected: a257cdd0e2179630d3201c32ba14d7fcb3c3a055 , < 1e96239fddcefacf6afe6c498357be68eacbcabc (git)
Affected: a257cdd0e2179630d3201c32ba14d7fcb3c3a055 , < bd69a825485168ef74e815ecb286754b570fdcc7 (git)
Affected: a257cdd0e2179630d3201c32ba14d7fcb3c3a055 , < 136b416593f1349cf6f72c8e3d18f0f204ee8545 (git)
Affected: a257cdd0e2179630d3201c32ba14d7fcb3c3a055 , < a5b42c1e4ff2befaa6b96f7cbf32174751eba083 (git)
Affected: a257cdd0e2179630d3201c32ba14d7fcb3c3a055 , < 0853ac544c590880d797b04daa33fcb72b6be0e1 (git)
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Linux Linux Affected: 2.6.13
Unaffected: 0 , < 2.6.13 (semver)
Unaffected: 5.10.260 , ≤ 5.10.* (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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            {
              "lang": "en",
              "value": "AV:N - The vulnerable code is in nfsd\u0027s NFS ACL program (RPC program 100227), reachable over the network via the in-kernel NFS server on TCP/UDP port 2049 when NFSD ACL support is enabled.\nAC:L - Once nfsd with ACL support is running, an attacker can reliably trigger the leak by sending a SETACL RPC with mask including both NFS_ACL and NFS_DFACL, a valid first ACL, and a malformed second ACL that fails decode.\nPR:N - Exploitation requires only network access as an NFS client with RPC credentials (AUTH_UNIX is spoofable) from a source IP matching an export entry; no local shell or real root on the server is needed.\nUI:N - Triggering the leak requires only crafted NFS ACL RPC packets; no victim user action such as mounting a filesystem or opening a file is required.\nS:U - The impact is confined to kernel memory consumption within the nfsd server context and does not cross a security boundary such as a VM, container, or IOMMU isolation boundary.\nC:N - This is a kmalloc leak of attacker-supplied ACL data with no out-of-bounds read, use-after-free, or other mechanism that exposes kernel memory to the attacker.\nI:N - The bug orphans allocated posix_acl objects without modifying file data, ACLs on disk, or any other integrity-protected resources.\nA:H - Each trigger permanently leaks a posix_acl allocation (up to ~16KB with max entries) for the server\u0027s lifetime; repeated remote SETACL requests can exhaust kernel memory and deny service to the NFS server and co-hosted workloads."
            }
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/bd69a825485168ef74e815ecb286754b570fdcc7"
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          "url": "https://git.kernel.org/stable/c/136b416593f1349cf6f72c8e3d18f0f204ee8545"
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        },
        {
          "url": "https://git.kernel.org/stable/c/0853ac544c590880d797b04daa33fcb72b6be0e1"
        }
      ],
      "title": "nfsd: fix posix_acl leak on SETACL decode failure",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53397",
    "datePublished": "2026-07-19T12:01:58.938Z",
    "dateReserved": "2026-06-09T07:44:35.402Z",
    "dateUpdated": "2026-08-17T04:50:49.240Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2026-53397",
      "date": "2026-09-03",
      "epss": "0.00529",
      "percentile": "0.42744"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-14T18:32:01.000Z",
      "cve": "CVE-2026-53397",
      "id": "msrc_CVE-2026-53397",
      "initial_release_date": "2026-07-20T01:05:52.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "nfsd: fix posix_acl leak on SETACL decode failure",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53397.json",
      "version": "8"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53397\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T12:16:50.793\",\"lastModified\":\"2026-08-17T05:17:14.277\",\"vulnStatus\":\"Analyzed\",\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/nfsd/nfs2acl.c\",\"fs/nfsd/nfs3acl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\",\"lessThan\":\"b2eb1ffd511d1b3c3e21122f97cbbccea411e277\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\",\"lessThan\":\"b94c4be77682aab06d65ca7296149e3bcfb37353\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\",\"lessThan\":\"887f92ceccf3eacd5f2402db21254d66372fae00\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\",\"lessThan\":\"1e96239fddcefacf6afe6c498357be68eacbcabc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\",\"lessThan\":\"bd69a825485168ef74e815ecb286754b570fdcc7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\",\"lessThan\":\"136b416593f1349cf6f72c8e3d18f0f204ee8545\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\",\"lessThan\":\"a5b42c1e4ff2befaa6b96f7cbf32174751eba083\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\",\"lessThan\":\"0853ac544c590880d797b04daa33fcb72b6be0e1\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/nfsd/nfs2acl.c\",\"fs/nfsd/nfs3acl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.13\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.13\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.260\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.211\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.177\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.144\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.38\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.3\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.13\",\"versionEndExcluding\":\"5.10.260\",\"matchCriteriaId\":\"CF75B610-8113-48DE-869D-5AE8D5481874\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.211\",\"matchCriteriaId\":\"D71C101E-388C-4A46-BD99-49049F7C5CFF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.177\",\"matchCriteriaId\":\"333C9E30-7FD4-46A2-94EF-C1AA1F3EE28B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.144\",\"matchCriteriaId\":\"C8AD3BC8-C843-423C-B9DB-CB52F67F578E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.95\",\"matchCriteriaId\":\"4E206B86-E0E3-4394-A93F-39F2D50A8AA8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.38\",\"matchCriteriaId\":\"FA591B28-5D62-449E-BDBE-3C9391BF070A\"},{\"vulnerable\":true,\"crite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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-03T04:55:59+00:00",
      "cve": "CVE-2026-53397",
      "id": "CVE-2026-53397",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:fixed": "459",
      "product_status:known_affected": "150",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nfsd: fix posix_acl leak on SETACL decode failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53397.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T13:33:46Z",
      "cve": "CVE-2026-53397",
      "id": "CVE-2026-53397",
      "initial_release_date": "2026-07-19T17:35:59Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "650",
      "product_status:recommended": "277",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53397",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53397.json",
      "version": "18"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.