CVE-2025-38724 (GCVE-0-2025-38724)

Vulnerability from cvelistv5 – Published: 2025-09-04 15:33 – Updated: 2026-08-05 12:04
VLAI
Title
nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm()
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm() Lei Lu recently reported that nfsd4_setclientid_confirm() did not check the return value from get_client_locked(). a SETCLIENTID_CONFIRM could race with a confirmed client expiring and fail to get a reference. That could later lead to a UAF. Fix this by getting a reference early in the case where there is an extant confirmed client. If that fails then treat it as if there were no confirmed client found at all. In the case where the unconfirmed client is expiring, just fail and return the result from get_client_locked().
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d20c11d86d8f821a64eac7d6c8f296f06d935f4f , < 3f252a73e81aa01660cb426735eab932e6182e8d (git)
Affected: d20c11d86d8f821a64eac7d6c8f296f06d935f4f , < d35ac850410966010e92f401f4e21868a9ea4d8b (git)
Affected: d20c11d86d8f821a64eac7d6c8f296f06d935f4f , < f3aac6cf390d8b80e1d82975faf4ac61175519c0 (git)
Affected: d20c11d86d8f821a64eac7d6c8f296f06d935f4f , < 22f45cedf281e6171817c8a3432c44d788c550e1 (git)
Affected: d20c11d86d8f821a64eac7d6c8f296f06d935f4f , < d71abd1ae4e0413707cd42b10c24a11d1aa71772 (git)
Affected: d20c11d86d8f821a64eac7d6c8f296f06d935f4f , < 74ad36ed60df561a303a19ecef400c7096b20306 (git)
Affected: d20c11d86d8f821a64eac7d6c8f296f06d935f4f , < 36e83eda90e0e4ac52f259f775b40b2841f8a0a3 (git)
Affected: d20c11d86d8f821a64eac7d6c8f296f06d935f4f , < 571a5e46c71490285d2d8c06f6b5a7cbf6c7edd1 (git)
Affected: d20c11d86d8f821a64eac7d6c8f296f06d935f4f , < 908e4ead7f757504d8b345452730636e298cbf68 (git)
Create a notification for this product.
Linux Linux Affected: 3.17
Unaffected: 0 , < 3.17 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.43 , ≤ 6.12.* (semver)
Unaffected: 6.15.11 , ≤ 6.15.* (semver)
Unaffected: 6.16.2 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
Create a notification for this product.
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get_client_locked().\"}],\"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\":\"d20c11d86d8f821a64eac7d6c8f296f06d935f4f\",\"lessThan\":\"3f252a73e81aa01660cb426735eab932e6182e8d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d20c11d86d8f821a64eac7d6c8f296f06d935f4f\",\"lessThan\":\"d35ac850410966010e92f401f4e21868a9ea4d8b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d20c11d86d8f821a64eac7d6c8f296f06d935f4f\",\"lessThan\":\"f3aac6cf390d8b80e1d82975faf4ac61175519c0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d20c11d86d8f821a64eac7d6c8f296f06d935f4f\",\"lessThan\":\"22f45cedf281e6171817c8a3432c44d788c550e1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d20c11d86d8f821a64eac7d6c8f296f06d935f4f\",\"lessThan\":\"d71abd1ae4e0413707cd42b10c24a11d1aa71772\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d20c11d86d8f821a64eac7d6c8f296f06d935f4f\",\"lessThan\":\"74ad36ed60df561a303a19ecef400c7096b20306\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d20c11d86d8f821a64eac7d6c8f296f06d935f4f\",\"lessThan\":\"36e83eda90e0e4ac52f259f775b40b2841f8a0a3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d20c11d86d8f821a64eac7d6c8f296f06d935f4f\",\"lessThan\":\"571a5e46c71490285d2d8c06f6b5a7cbf6c7edd1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d20c11d86d8f821a64eac7d6c8f296f06d935f4f\",\"lessThan\":\"908e4ead7f757504d8b345452730636e298cbf68\",\"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\":\"3.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.297\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.241\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.190\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.149\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.103\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.43\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15.11\",\"lessThanOrEqual\":\"6.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.16.2\",\"lessThanOrEqual\":\"6.16.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.17\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC 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      "current_release_date": "2026-07-30T09:02:23+00:00",
      "cve": "CVE-2025-38724",
      "id": "CVE-2025-38724",
      "initial_release_date": "2025-09-04T00:00:00+00:00",
      "product_status:fixed": "2311",
      "product_status:known_affected": "64",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38724.json",
      "version": "3"
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      "current_release_date": "2026-07-31T01:07:13Z",
      "cve": "CVE-2025-38724",
      "id": "CVE-2025-38724",
      "initial_release_date": "2025-09-04T23:23:16Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "624",
      "product_status:known_not_affected": "11",
      "product_status:recommended": "640",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38724",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38724.json",
      "version": "55"
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No local access to the server is needed.\\nAC:L - The attacker controls its own side of the race and can issue unauthenticated SETCLIENTID_CONFIRM operations at arbitrary rate, and the vulnerable window (force_expire_client() parked in wait_event for cl_rpc_users to drain) stays open as long as the attacker keeps RPCs in flight, so the window is attacker-widened rather than narrow. The forced-expire trigger is an administrative action, but it is the documented response to exactly the kind of misbehaving client the attacker can pose as.\\nPR:N - OP_SETCLIENTID_CONFIRM is ALLOWED_WITHOUT_FH/ALLOWED_ON_ABSENT_FS, so no filehandle or export access check is performed, and under the default AUTH_SYS/AUTH_NULL flavors the RPC credentials are self-asserted and never verified. Any host able to reach the NFS port can reach the bug.\\nUI:N - The attack is completed entirely by the attacker\u0027s own NFS traffic; no victim opens a file, mounts a filesystem, or otherwise interacts. The concurrent client-expiry is a system/administrative state condition folded into Attack Complexity, not user interaction.\\nS:U - The corrupted object (struct nfs4_client) and all consequences remain within the kernel of the NFS server; no VM, IOMMU, or sandbox boundary is crossed.\\nC:H - The freed struct nfs4_client is used after free (fsnotify_dentry, nfsd4_probe_callback) and its slab can be re-occupied by attacker-groomed data, giving a path to disclose arbitrary kernel memory. Per kernel scoring guidance a UAF is scored C:H.\\nI:H - The UAF yields concrete write primitives on freed memory \\u2014 set_bit() on cl_flags, memcpy() into cl_cb_conn, and an unbalanced atomic_dec() in put_client_renew_locked() \\u2014 plus a function-pointer dereference via nfsd4_run_cb(\u0026clp-\u003ecl_cb_null), which is exploitable for control-flow hijacking.\\nA:H - The use-after-free reliably oopses or panics the NFS server; additionally renew_client_locked() hits WARN_ON(1) (fatal with panic_on_warn) and the cl_rpc_users underflow to -1 leaves force_expire_client() stuck forever in wait_event, producing an unkillable hung task.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"d20c11d86d8f821a64eac7d6c8f296f06d935f4f\", \"lessThan\": \"3f252a73e81aa01660cb426735eab932e6182e8d\", \"versionType\": \"git\"}, {\"status\": 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\"https://git.kernel.org/stable/c/3f252a73e81aa01660cb426735eab932e6182e8d\"}, {\"url\": \"https://git.kernel.org/stable/c/d35ac850410966010e92f401f4e21868a9ea4d8b\"}, {\"url\": \"https://git.kernel.org/stable/c/f3aac6cf390d8b80e1d82975faf4ac61175519c0\"}, {\"url\": \"https://git.kernel.org/stable/c/22f45cedf281e6171817c8a3432c44d788c550e1\"}, {\"url\": \"https://git.kernel.org/stable/c/d71abd1ae4e0413707cd42b10c24a11d1aa71772\"}, {\"url\": \"https://git.kernel.org/stable/c/74ad36ed60df561a303a19ecef400c7096b20306\"}, {\"url\": \"https://git.kernel.org/stable/c/36e83eda90e0e4ac52f259f775b40b2841f8a0a3\"}, {\"url\": \"https://git.kernel.org/stable/c/571a5e46c71490285d2d8c06f6b5a7cbf6c7edd1\"}, {\"url\": \"https://git.kernel.org/stable/c/908e4ead7f757504d8b345452730636e298cbf68\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm()\\n\\nLei Lu recently reported that nfsd4_setclientid_confirm() did not check\\nthe return value from get_client_locked(). a SETCLIENTID_CONFIRM could\\nrace with a confirmed client expiring and fail to get a reference. That\\ncould later lead to a UAF.\\n\\nFix this by getting a reference early in the case where there is an\\nextant confirmed client. If that fails then treat it as if there were no\\nconfirmed client found at all.\\n\\nIn the case where the unconfirmed client is expiring, just fail and\\nreturn the result from get_client_locked().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.297\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.241\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.190\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.149\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.103\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.43\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.15.11\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.16.2\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.17\", \"versionStartIncluding\": \"3.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:04:18.336Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-38724\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T12:04:18.336Z\", \"dateReserved\": \"2025-04-16T04:51:24.033Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-04T15:33:22.370Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





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.