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CVE-2026-53398 (GCVE-0-2026-53398)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:01 – Updated: 2026-08-17 04:50
VLAI
Title
NFSD: Fix SECINFO_NO_NAME decode error cleanup
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix SECINFO_NO_NAME decode error cleanup nfsd4_decode_secinfo_no_name() currently initializes sin_exp after decoding sin_style. If the XDR stream is truncated, the decoder returns nfserr_bad_xdr before sin_exp is initialized. Since commit 3fdc54646234 ("NFSD: Reduce amount of struct nfsd4_compoundargs that needs clearing"), the inline iops array is not cleared between RPC calls. A failed SECINFO_NO_NAME decode can therefore leave sin_exp holding stale union contents from a previous operation. The error response path still invokes nfsd4_secinfo_no_name_release(), which calls exp_put() on a non-NULL sin_exp. Initialize sin_exp before the first failable decode step, matching nfsd4_decode_secinfo().
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5e76b25d7cc82c148d391c0c43b884e6427cb302 , < 8836405abdc53ca3dd5fc68b2cf6f8f012fad011 (git)
Affected: 07b68ff5c71cf4ed5443016d8eb116863c0a4d88 , < 49de5d31dd8fdebf78bdeaf196b0ca5cd5c75439 (git)
Affected: 3fdc546462348b8a497c72bc894e0cde9f10fc40 , < 5ec37edcb534f3fc92304be236d37f08e6545585 (git)
Affected: 3fdc546462348b8a497c72bc894e0cde9f10fc40 , < 1e04be34cafae119e82bcaccd6d28a20f72a3647 (git)
Affected: 3fdc546462348b8a497c72bc894e0cde9f10fc40 , < 161d1aaeb04d620d3692639700512bb5038c1e10 (git)
Affected: 3fdc546462348b8a497c72bc894e0cde9f10fc40 , < c8a24effd96d4779e2ad779654682304491c55a5 (git)
Affected: 3fdc546462348b8a497c72bc894e0cde9f10fc40 , < 46eb17d45be69d28c7a23ea03283b207426a8232 (git)
Affected: 3fdc546462348b8a497c72bc894e0cde9f10fc40 , < 9e18e83b8846a5c3fe13fc8a464b4865d33996c6 (git)
Affected: 5.10.220 , < 5.10.260 (semver)
Affected: 5.15.154 , < 5.15.211 (semver)
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Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (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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              "value": "AV:N - The bug is in nfsd4_decode_secinfo_no_name() on the NFSv4 COMPOUND RPC decode path; nfsd is an in-kernel network file server reached remotely over TCP/UDP port 2049 by any client that can connect.\nAC:L - An attacker on the same TCP connection can first send a valid SECINFO_NO_NAME compound to leave a dangling sin_exp in the reused iops[] slot, then send a truncated SECINFO_NO_NAME to trigger nfserr_bad_xdr and nfsd4_secinfo_no_name_release() without re-initializing sin_exp.\nPR:N - Exploitation requires only network reachability to nfsd and standard NFSv4.1 session setup (EXCHANGE_ID/CREATE_SESSION/SEQUENCE); default exports accept RPC_AUTH_NULL with no local privileges, matching an unauthenticated remote attacker on a misconfigured or internet-exposed NFS server.\nUI:N - No victim user action is required; the attacker triggers the bug entirely by sending crafted NFSv4 COMPOUND RPC requests to the server.\nS:U - Impact is confined to kernel nfsd/export-cache memory mismanagement on the NFS server; it does not cross a VM, container, or IOMMU security boundary.\nC:H - The stale sin_exp causes exp_put()/cache_put() on an uninitialized or already-freed svc_export pointer, corrupting export-cache refcounts and creating a use-after-free that can be leveraged for arbitrary kernel memory disclosure.\nI:H - Incorrect kref_put() on a dangling or garbage svc_export pointer is exploitable memory corruption that can lead to further heap manipulation and potential arbitrary kernel code execution, not merely a bounded error.\nA:H - Calling exp_put() on an invalid pointer reliably causes kernel oops/panic or premature export-cache destruction, producing high availability impact including NFS service disruption and possible full kernel crash."
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A failed SECINFO_NO_NAME decode can therefore\\nleave sin_exp holding stale union contents from a previous operation.\\n\\nThe error response path still invokes nfsd4_secinfo_no_name_release(),\\nwhich calls exp_put() on a non-NULL sin_exp.\\n\\nInitialize sin_exp before the first failable decode step, 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inux: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/161d1aaeb04d620d3692639700512bb5038c1e10\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1e04be34cafae119e82bcaccd6d28a20f72a3647\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/46eb17d45be69d28c7a23ea03283b207426a8232\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/49de5d31dd8fdebf78bdeaf196b0ca5cd5c75439\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5ec37edcb534f3fc92304be236d37f08e6545585\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8836405abdc53ca3dd5fc68b2cf6f8f012fad011\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9e18e83b8846a5c3fe13fc8a464b4865d33996c6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c8a24effd96d4779e2ad779654682304491c55a5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-20T15:27:46+00:00",
      "cve": "CVE-2026-53398",
      "id": "CVE-2026-53398",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "76",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: NFSD: Fix SECINFO_NO_NAME decode error cleanup",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53398.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T16:41:25Z",
      "cve": "CVE-2026-53398",
      "id": "CVE-2026-53398",
      "initial_release_date": "2026-07-19T17:35:58Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "453",
      "product_status:known_not_affected": "251",
      "product_status:recommended": "254",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53398",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53398.json",
      "version": "17"
    }
  }
}



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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.