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CVE-2026-89680 (GCVE-0-2026-89680)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-13 06:33
VLAI
Title
nfsd: fix nfsd_file leak on inter-server COPY setup failure
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix nfsd_file leak on inter-server COPY setup failure When nfsd4_setup_inter_ssc() fails, nfsd4_copy() returns nfserr_offload_denied directly, bypassing the out: label where release_copy_files() would drop the nf_dst reference taken by nfs4_preprocess_stateid_op(). Each failed inter-server COPY leaks one nfsd_file, pinning file/inode/dentry/vfsmount. Fix by setting status and jumping to out: instead of returning directly.
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: ce0887ac96d35c7105090e166bb0807dc0a0e838 , < 1a6a41b848455bf6ba2c9da2dfb0730e608ce7ab (git)
Affected: ce0887ac96d35c7105090e166bb0807dc0a0e838 , < 424d5c95108a4809b832cb0a312c61de4aec0078 (git)
Affected: ce0887ac96d35c7105090e166bb0807dc0a0e838 , < 6ed8d6de7ec90c4ba84eb82673058f506e5777fd (git)
Affected: ce0887ac96d35c7105090e166bb0807dc0a0e838 , < 88a76145451d703eedd867b5989bf73d17340399 (git)
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Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfs4proc.c"
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          "vendor": "Linux",
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              "status": "affected",
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              "versionType": "git"
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          "vendor": "Linux",
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              "version": "0",
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                  "versionStartIncluding": "5.6",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix nfsd_file leak on inter-server COPY setup failure\n\nWhen nfsd4_setup_inter_ssc() fails, nfsd4_copy() returns\nnfserr_offload_denied directly, bypassing the out: label where\nrelease_copy_files() would drop the nf_dst reference taken by\nnfs4_preprocess_stateid_op(). Each failed inter-server COPY\nleaks one nfsd_file, pinning file/inode/dentry/vfsmount.\n\nFix by setting status and jumping to out: instead of returning\ndirectly."
        }
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              "value": "AV:N - nfsd\u0027s NFSv4.2 OP_COPY is reached over TCP/2049: svc_recv to nfsd_dispatch to nfsd4_proc_compound to nfsd4_copy to nfsd4_setup_inter_ssc. A remote client triggers the leak with a COMPOUND; no local access to the server is required.\nAC:L - Once inter-server COPY offload is enabled, the attacker controls every trigger: async COPY on the wire, a valid dest write stateid, and a source nl4_server that makes nfsd4_interssc_connect fail (bad uaddr/netid or failed mount). No race or attacker-uncontrollable layout is required.\nPR:N - Under default AUTH_SYS, EXCHANGE_ID/CREATE_SESSION and OPEN verify no secret; a remote client permitted by the export asserts a UID and obtains write stateids. This matches PR:N on the same nfsd4_copy path (CVE-2024-53073, CVE-2024-50241).\nUI:N - The attacker\u0027s own NFSv4.2 COMPOUND traffic drives nfsd4_copy; no administrator or local user on the server must mount, open a file, or otherwise interact beyond nfsd already serving an export.\nS:U - The leaked nfsd_file reference pins file/inode/dentry/vfsmount inside the NFS server kernel\u0027s own security authority; there is no VM, IOMMU, or sandbox boundary crossing.\nC:N - The defect only skips nfsd_file_put() on an extra filecache reference taken by nfs4_preprocess_stateid_op(); there is no out-of-bounds read, use-after-free, or other disclosure of kernel memory to the client.\nI:N - COPY setup fails before nfsd_copy_range, so no file data is modified; the leaked reference is not attacker-controlled reused memory and yields no write or control-flow primitive.\nA:H - Each failed inter-server COPY permanently leaks one nfsd_file ref, pinning the dest file/inode/dentry/vfsmount. Repeating against many created-then-unlinked files unbounded-pins slab and inodes and blocks umount, enabling remote kernel memory exhaustion and NFS server DoS."
            }
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        }
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/1a6a41b848455bf6ba2c9da2dfb0730e608ce7ab"
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    "cveId": "CVE-2026-89680",
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    "dateReserved": "2026-09-11T19:38:34.748Z",
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    "state": "PUBLISHED"
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      "cve": "CVE-2026-89680",
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      "title": "kernel: Linux Kernel nfsd: Denial of Service via resource leak during inter-server COPY setup",
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      "cve": "CVE-2026-89680",
      "id": "CVE-2026-89680",
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}



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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

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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.