CVEvulnerability
CVE-2026-89699
7.5 HIGH
Official page ↗
- Status
- Received
- Published
- 2026-09-11
- Last modified
- 2026-10-19
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- CVSS 3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Description
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.
References
- https://git.kernel.org/stable/c/041f57056e5fb9c80adc088269322d2c61074406 git.kernel.org
- https://git.kernel.org/stable/c/36011308b3f01ce7dc9954f3cefcbb5291af9f95 git.kernel.org
- https://git.kernel.org/stable/c/3ef5e7a01a4d74995a65496bc9166d1e980a4355 git.kernel.org
- https://git.kernel.org/stable/c/45ec115cbfecb4b3cfab7fca6f73d1b60696a25a git.kernel.org
- https://git.kernel.org/stable/c/8661d3cb38fd148947e57dbc0871fd4d3fa33bbf git.kernel.org
- https://git.kernel.org/stable/c/888dad4b557352cf85be31613407b5ba51ad07d1 git.kernel.org
- https://git.kernel.org/stable/c/895a485cd3758031ef9993c0d53cf19ce8fb4ccc git.kernel.org
- https://git.kernel.org/stable/c/b24843ea3de1676b29902457b38507c95a80649b git.kernel.org