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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": "2026-09-16",
      "epss": "0.00529",
      "percentile": "0.43442"
    },
    "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,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.1.3\",\"matchCriteriaId\":\"9526B150-E2B3-4C6F-8AE5-1AF92B75AD9E\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0853ac544c590880d797b04daa33fcb72b6be0e1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/136b416593f1349cf6f72c8e3d18f0f204ee8545\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1e96239fddcefacf6afe6c498357be68eacbcabc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/887f92ceccf3eacd5f2402db21254d66372fae00\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a5b42c1e4ff2befaa6b96f7cbf32174751eba083\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b2eb1ffd511d1b3c3e21122f97cbbccea411e277\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b94c4be77682aab06d65ca7296149e3bcfb37353\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/bd69a825485168ef74e815ecb286754b570fdcc7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-04T08:03:35+00:00",
      "cve": "CVE-2026-53397",
      "id": "CVE-2026-53397",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:fixed": "762",
      "product_status:known_affected": "64",
      "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": "2026-09-16T00:10:39Z",
      "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": "380",
      "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": "21"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.