CVE-2026-89699
nfsd: validate symlink target length in NFSv4 CREATE
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 11, 2026 |
| Last Updated | Sep 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Linux / Linux
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 36011308b3f01ce7dc9954f3cefcbb5291af9f95 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 888dad4b557352cf85be31613407b5ba51ad07d1 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8661d3cb38fd148947e57dbc0871fd4d3fa33bbf 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3ef5e7a01a4d74995a65496bc9166d1e980a4355 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b24843ea3de1676b29902457b38507c95a80649b 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 895a485cd3758031ef9993c0d53cf19ce8fb4ccc 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 45ec115cbfecb4b3cfab7fca6f73d1b60696a25a 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 041f57056e5fb9c80adc088269322d2c61074406
Linux / Linux
2.6.12
References
git.kernel.org: https://git.kernel.org/stable/c/36011308b3f01ce7dc9954f3cefcbb5291af9f95 git.kernel.org: https://git.kernel.org/stable/c/888dad4b557352cf85be31613407b5ba51ad07d1 git.kernel.org: https://git.kernel.org/stable/c/8661d3cb38fd148947e57dbc0871fd4d3fa33bbf git.kernel.org: https://git.kernel.org/stable/c/3ef5e7a01a4d74995a65496bc9166d1e980a4355 git.kernel.org: https://git.kernel.org/stable/c/b24843ea3de1676b29902457b38507c95a80649b git.kernel.org: https://git.kernel.org/stable/c/895a485cd3758031ef9993c0d53cf19ce8fb4ccc git.kernel.org: https://git.kernel.org/stable/c/45ec115cbfecb4b3cfab7fca6f73d1b60696a25a git.kernel.org: https://git.kernel.org/stable/c/041f57056e5fb9c80adc088269322d2c61074406