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CVE-2026-89694 (GCVE-0-2026-89694)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-14 12:02
VLAI
Title
nfsd: check client ownership when cancelling a copy-notify stateid
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: check client ownership when cancelling a copy-notify stateid On the OFFLOAD_CANCEL path (clp != NULL), manage_cpntf_state() freed the target cpntf state without checking ownership. The lookup key st->si_opaque.so_id is allocated cyclically (guessable) and the embedded clientid is the fixed per-net nn->s2s_cp_cl_id, so any authenticated NFSv4.2 client could cancel and free another client's copy-notify stateid. Compare the creating clientid recorded in state->cp_p_clid against the requesting client's cl_clientid and return nfserr_bad_stateid on a mismatch instead of freeing the entry.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ce0887ac96d35c7105090e166bb0807dc0a0e838 , < 88daaed26e17e1c7e851859b5bbb4f0e1ab6d0e9 (git)
Affected: ce0887ac96d35c7105090e166bb0807dc0a0e838 , < 81b2cfe767943922eca906a2a5af23a0ce5d0f35 (git)
Affected: ce0887ac96d35c7105090e166bb0807dc0a0e838 , < 6bba72b8ee68ad631b94bd439592cba46de54d7d (git)
Affected: ce0887ac96d35c7105090e166bb0807dc0a0e838 , < 75268f6cfe26b09a7e4d3216367e87fe9e2a26aa (git)
Affected: ce0887ac96d35c7105090e166bb0807dc0a0e838 , < b1eca07303594ca27f5dc360a6946bd7e1f5b04c (git)
Affected: ce0887ac96d35c7105090e166bb0807dc0a0e838 , < b42dc26a14b4ad5d6daaada11ec4c70744141c25 (git)
Affected: ce0887ac96d35c7105090e166bb0807dc0a0e838 , < d801906165cb5cc250d5cbe44935594e170be3e2 (git)
Affected: ce0887ac96d35c7105090e166bb0807dc0a0e838 , < 6bdbfab96e0cf25e5f57dac5c09dc1749751a4bf (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (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)
guessed Create a notification for this product.
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: check client ownership when cancelling a copy-notify stateid\n\nOn the OFFLOAD_CANCEL path (clp != NULL), manage_cpntf_state() freed the\ntarget cpntf state without checking ownership. The lookup key\nst-\u003esi_opaque.so_id is allocated cyclically (guessable) and the embedded\nclientid is the fixed per-net nn-\u003es2s_cp_cl_id, so any authenticated\nNFSv4.2 client could cancel and free another client\u0027s copy-notify\nstateid.\n\nCompare the creating clientid recorded in state-\u003ecp_p_clid against the\nrequesting client\u0027s cl_clientid and return nfserr_bad_stateid on a\nmismatch instead of freeing the entry."
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    "datePublished": "2026-09-11T19:46:13.519Z",
    "dateReserved": "2026-09-11T19:38:34.749Z",
    "dateUpdated": "2026-09-14T12:02:02.130Z",
    "state": "PUBLISHED"
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    },
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      "cve": "CVE-2026-89694",
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The lookup key\\nst-\u003esi_opaque.so_id is allocated cyclically (guessable) and the embedded\\nclientid is the fixed per-net nn-\u003es2s_cp_cl_id, so any authenticated\\nNFSv4.2 client could cancel and free another client\u0027s copy-notify\\nstateid.\\n\\nCompare the creating clientid recorded in state-\u003ecp_p_clid against the\\nrequesting client\u0027s cl_clientid and return nfserr_bad_stateid on a\\nmismatch instead of freeing the entry.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/nfsd/nfs4state.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ce0887ac96d35c7105090e166bb0807dc0a0e838\",\"lessThan\":\"88daaed26e17e1c7e851859b5bbb4f0e1ab6d0e9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ce0887ac96d35c7105090e166bb0807dc0a0e838\",\"lessThan\":\"81b2cfe767943922eca906a2a5af23a0ce5d0f35\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ce0887ac96d35c7105090e166bb0807dc0a0e838\",\"lessThan\":\"6bba72b8ee68ad631b94bd439592cba46de54d7d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ce0887ac96d35c7105090e166bb0807dc0a0e838\",\"lessThan\":\"75268f6cfe26b09a7e4d3216367e87fe9e2a26aa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ce0887ac96d35c7105090e166bb0807dc0a0e838\",\"lessThan\":\"b1eca07303594ca27f5dc360a6946bd7e1f5b04c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ce0887ac96d35c7105090e166bb0807dc0a0e838\",\"lessThan\":\"b42dc26a14b4ad5d6daaada11ec4c70744141c25\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ce0887ac96d35c7105090e166bb0807dc0a0e838\",\"lessThan\":\"d801906165cb5cc250d5cbe44935594e170be3e2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ce0887ac96d35c7105090e166bb0807dc0a0e838\",\"lessThan\":\"6bdbfab96e0cf25e5f57dac5c09dc1749751a4bf\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/nfsd/nfs4state.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.6\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.6\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6bba72b8ee68ad631b94bd439592cba46de54d7d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6bdbfab96e0cf25e5f57dac5c09dc1749751a4bf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/75268f6cfe26b09a7e4d3216367e87fe9e2a26aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/81b2cfe767943922eca906a2a5af23a0ce5d0f35\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/88daaed26e17e1c7e851859b5bbb4f0e1ab6d0e9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b1eca07303594ca27f5dc360a6946bd7e1f5b04c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b42dc26a14b4ad5d6daaada11ec4c70744141c25\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d801906165cb5cc250d5cbe44935594e170be3e2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-15T05:07:57+00:00",
      "cve": "CVE-2026-89694",
      "id": "CVE-2026-89694",
      "initial_release_date": "2026-09-11T19:46:13.519000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel (nfsd): Denial of Service via improper ownership check in copy-notify stateid cancellation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89694.json",
      "version": "3"
    },
    "suse_vex": {
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      "current_release_date": "2026-09-16T00:00:04Z",
      "cve": "CVE-2026-89694",
      "id": "CVE-2026-89694",
      "initial_release_date": "2026-09-15T00:56:46Z",
      "product_status:known_affected": "210",
      "product_status:known_not_affected": "143",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89694",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89694.json",
      "version": "3"
    }
  }
}



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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.

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  • 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.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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