{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89699", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.750Z", "datePublished": "2026-09-11T19:46:17.293Z", "dateUpdated": "2026-09-11T19:46:17.293Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:46:17.293Z"}, "descriptions": [{"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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/nfs4xdr.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "b24843ea3de1676b29902457b38507c95a80649b", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "895a485cd3758031ef9993c0d53cf19ce8fb4ccc", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "45ec115cbfecb4b3cfab7fca6f73d1b60696a25a", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "041f57056e5fb9c80adc088269322d2c61074406", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/nfs4xdr.c"], "versions": [{"version": "2.6.12", "status": "affected"}, {"version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b24843ea3de1676b29902457b38507c95a80649b"}, {"url": "https://git.kernel.org/stable/c/895a485cd3758031ef9993c0d53cf19ce8fb4ccc"}, {"url": "https://git.kernel.org/stable/c/45ec115cbfecb4b3cfab7fca6f73d1b60696a25a"}, {"url": "https://git.kernel.org/stable/c/041f57056e5fb9c80adc088269322d2c61074406"}], "title": "nfsd: validate symlink target length in NFSv4 CREATE", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/nfsd/nfs4xdr.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "b24843ea3de1676b29902457b38507c95a80649b", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "895a485cd3758031ef9993c0d53cf19ce8fb4ccc", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "45ec115cbfecb4b3cfab7fca6f73d1b60696a25a", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "041f57056e5fb9c80adc088269322d2c61074406", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/nfsd/nfs4xdr.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.12"}, {"lessThan": "2.6.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"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."}], "id": "CVE-2026-89699", "lastModified": "2026-09-11T20:19:57.077", "metrics": {}, "published": "2026-09-11T20:19:57.077", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/041f57056e5fb9c80adc088269322d2c61074406"}, {"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/895a485cd3758031ef9993c0d53cf19ce8fb4ccc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b24843ea3de1676b29902457b38507c95a80649b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: nfsd vulnerable to denial of service via oversized NFSv4 symlink targets", "id": "2532157", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532157"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["A flaw was found in the Linux kernel's Network File System Daemon (nfsd) when handling NFSv4 CREATE operations. A remote attacker can exploit this by sending a crafted request with an oversized symbolic link (symlink) target length. This unbounded length can force the kernel to allocate a large amount of memory, leading to a denial of service (DoS) condition on the system."], "name": "CVE-2026-89699", "public_date": "2026-09-11T19:46:17Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89699\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89699\nhttps://git.kernel.org/stable/c/041f57056e5fb9c80adc088269322d2c61074406\nhttps://git.kernel.org/stable/c/45ec115cbfecb4b3cfab7fca6f73d1b60696a25a\nhttps://git.kernel.org/stable/c/895a485cd3758031ef9993c0d53cf19ce8fb4ccc\nhttps://git.kernel.org/stable/c/b24843ea3de1676b29902457b38507c95a80649b"], "threat_severity": "Moderate"}

{}