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CVE-2026-89699 (GCVE-0-2026-89699)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-14 12:02
VLAI
Title
nfsd: validate symlink target length in NFSv4 CREATE
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: validate symlink target length in NFSv4 CREATE nfsd4_decode_create() accepts an unbounded cr_datalen from the wire for NF4LNK symlink targets, allowing a client to force a kmalloc of up to the maximum RPC payload size (several MiB) per COMPOUND op that persists until compound teardown. The VFS rejects oversized targets with ENAMETOOLONG, but the allocation has already occurred. Reject cr_datalen == 0 early with nfserr_inval and cr_datalen greater than NFS4_MAXPATHLEN (PATH_MAX) with nfserr_nametoolong to bound the allocation.
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: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 36011308b3f01ce7dc9954f3cefcbb5291af9f95 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 888dad4b557352cf85be31613407b5ba51ad07d1 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8661d3cb38fd148947e57dbc0871fd4d3fa33bbf (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3ef5e7a01a4d74995a65496bc9166d1e980a4355 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b24843ea3de1676b29902457b38507c95a80649b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 895a485cd3758031ef9993c0d53cf19ce8fb4ccc (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 45ec115cbfecb4b3cfab7fca6f73d1b60696a25a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 041f57056e5fb9c80adc088269322d2c61074406 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (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)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: validate symlink target length in NFSv4 CREATE\n\nnfsd4_decode_create() accepts an unbounded cr_datalen from the wire for\nNF4LNK symlink targets, allowing a client to force a kmalloc of up to\nthe maximum RPC payload size (several MiB) per COMPOUND op that persists\nuntil compound teardown.  The VFS rejects oversized targets with\nENAMETOOLONG, but the allocation has already occurred.\n\nReject cr_datalen == 0 early with nfserr_inval and cr_datalen greater\nthan NFS4_MAXPATHLEN (PATH_MAX) with nfserr_nametoolong to bound the\nallocation."
        }
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            "baseSeverity": "HIGH",
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            "version": "3.1"
          },
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            {
              "lang": "en",
              "value": "AV:N - The flaw is reached through the in-kernel NFS server (nfsd) when a remote client sends an NFSv4 COMPOUND containing OP_CREATE of type NF4LNK over TCP/UDP port 2049; nfsd4_decode_create() runs during XDR decode of that compound.\nAC:L - A client fully controls cr_datalen on the wire; one COMPOUND with an NF4LNK target larger than PATH_MAX but within the RPC payload deterministically forces svcxdr_dupstr()/kmalloc of that size, with no race or attacker-uncontrollable condition.\nPR:N - The oversized kmalloc occurs in nfsd4_decode_compound() before SEQUENCE/session checks, PUTFH, fh_verify(), or export flavor enforcement; AUTH_NULL and AUTH_UNIX are accepted at the RPC layer, so an unauthenticated peer that can reach nfsd needs no host credentials.\nUI:N - Exploitation requires only attacker-sent NFSv4 COMPOUND RPCs; no administrator or end-user action on the server is needed beyond nfsd already listening.\nS:U - Impact is confined to kernel memory consumption on the NFS server within the same security authority; there is no VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:N - The defect only copies attacker-supplied symlink-target bytes into a correctly sized kmalloc buffer; there is no out-of-bounds read, use-after-free, or other disclosure primitive.\nI:N - There is no memory corruption or attacker-controlled write; the buffer is sized to cr_datalen and is only a temporary copy that filesystems later reject with ENAMETOOLONG.\nA:H - Each COMPOUND can force a GFP_KERNEL kmalloc of up to the maximum RPC payload (several MiB) on an nfsd thread until compound teardown; flooding concurrent requests across nfsd threads can exhaust kernel memory and OOM or stall the host."
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/8661d3cb38fd148947e57dbc0871fd4d3fa33bbf"
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    "dateReserved": "2026-09-11T19:38:34.750Z",
    "dateUpdated": "2026-09-14T12:02:05.331Z",
    "state": "PUBLISHED"
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      "date": "2026-09-16",
      "epss": "0.00508",
      "percentile": "0.42107"
    },
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      "cve": "CVE-2026-89699",
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      "product_status:known_affected": "1",
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      "status": "final",
      "title": "nfsd: validate symlink target length in NFSv4 CREATE",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89699.json",
      "version": "2"
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The VFS rejects oversized targets with\\nENAMETOOLONG, but the allocation has already occurred.\\n\\nReject cr_datalen == 0 early with nfserr_inval and cr_datalen greater\\nthan NFS4_MAXPATHLEN (PATH_MAX) with nfserr_nametoolong to bound the\\nallocation.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/nfsd/nfs4xdr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"36011308b3f01ce7dc9954f3cefcbb5291af9f95\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"888dad4b557352cf85be31613407b5ba51ad07d1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"8661d3cb38fd148947e57dbc0871fd4d3fa33bbf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"3ef5e7a01a4d74995a65496bc9166d1e980a4355\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"b24843ea3de1676b29902457b38507c95a80649b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"895a485cd3758031ef9993c0d53cf19ce8fb4ccc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"45ec115cbfecb4b3cfab7fca6f73d1b60696a25a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"041f57056e5fb9c80adc088269322d2c61074406\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/nfsd/nfs4xdr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"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\":{\"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}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/041f57056e5fb9c80adc088269322d2c61074406\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/36011308b3f01ce7dc9954f3cefcbb5291af9f95\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3ef5e7a01a4d74995a65496bc9166d1e980a4355\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/45ec115cbfecb4b3cfab7fca6f73d1b60696a25a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8661d3cb38fd148947e57dbc0871fd4d3fa33bbf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/888dad4b557352cf85be31613407b5ba51ad07d1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/895a485cd3758031ef9993c0d53cf19ce8fb4ccc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b24843ea3de1676b29902457b38507c95a80649b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-13T07:00:53+00:00",
      "cve": "CVE-2026-89699",
      "id": "CVE-2026-89699",
      "initial_release_date": "2026-09-11T19:46:17.293000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: nfsd vulnerable to denial of service via oversized NFSv4 symlink targets",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89699.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-13T16:56:58Z",
      "cve": "CVE-2026-89699",
      "id": "CVE-2026-89699",
      "initial_release_date": "2026-09-12T16:23:27Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89699",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89699.json",
      "version": "3"
    }
  }
}



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  • 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.