Answer in brief
CVE-2026-89699 records a High severity (CVSS 7.5) vulnerability in nfsd: validate symlink target length in NFSv4 CREATE. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b24843ea3de1676b29902457b38507c95a80649b || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <895a485cd3758031ef9993c0d53cf19ce8fb4ccc || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <45ec115cbfecb4b3cfab7fca6f73d1b60696a25a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <041f57056e5fb9c80adc088269322d2c61074406 | b24843ea3de1676b29902457b38507c95a80649b, 895a485cd3758031ef9993c0d53cf19ce8fb4ccc, 45ec115cbfecb4b3cfab7fca6f73d1b60696a25a, 041f57056e5fb9c80adc088269322d2c61074406 |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <36011308b3f01ce7dc9954f3cefcbb5291af9f95 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <888dad4b557352cf85be31613407b5ba51ad07d1 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8661d3cb38fd148947e57dbc0871fd4d3fa33bbf || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3ef5e7a01a4d74995a65496bc9166d1e980a4355 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b24843ea3de1676b29902457b38507c95a80649b || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <895a485cd3758031ef9993c0d53cf19ce8fb4ccc || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <45ec115cbfecb4b3cfab7fca6f73d1b60696a25a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <041f57056e5fb9c80adc088269322d2c61074406 | 36011308b3f01ce7dc9954f3cefcbb5291af9f95, 888dad4b557352cf85be31613407b5ba51ad07d1, 8661d3cb38fd148947e57dbc0871fd4d3fa33bbf, 3ef5e7a01a4d74995a65496bc9166d1e980a4355, b24843ea3de1676b29902457b38507c95a80649b, 895a485cd3758031ef9993c0d53cf19ce8fb4ccc, 45ec115cbfecb4b3cfab7fca6f73d1b60696a25a, 041f57056e5fb9c80adc088269322d2c61074406 |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
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.
Quoted source text, attributed separately from HOL analysis.