CVE-2026-89699High· 7.5▾ TwilightIn 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 …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 5.3
none → medium
— → 7.5
none → high
7.5 → 5.3
high → medium
5.3 → 7.5
medium → high
7.5 → 5.5
high → medium
0.2% → 0.7%
5.5 → 7.5
medium → high
Last analysed / modified upstream
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.
Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 36011308b3f01ce7dc9954f3cefcbb5291af9f95Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 888dad4b557352cf85be31613407b5ba51ad07d1Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8661d3cb38fd148947e57dbc0871fd4d3fa33bbfLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3ef5e7a01a4d74995a65496bc9166d1e980a4355Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b24843ea3de1676b29902457b38507c95a80649bLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 895a485cd3758031ef9993c0d53cf19ce8fb4cccLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 45ec115cbfecb4b3cfab7fca6f73d1b60696a25aLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 041f57056e5fb9c80adc088269322d2c61074406Linux 2.6.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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