Strix
64.2K

CVE-2026-89699

HIGHCVSS 7.5/10EPSS 0.45%

Last modified

CVE-2026-89699 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 0.45% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
0.45%

37.7th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 36011308b3f01ce7dc9954f3cefcbb5291af9f95; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 888dad4b557352cf85be31613407b5ba51ad07d1; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 8661d3cb38fd148947e57dbc0871fd4d3fa33bbf; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 3ef5e7a01a4d74995a65496bc9166d1e980a4355; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < b24843ea3de1676b29902457b38507c95a80649b; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 895a485cd3758031ef9993c0d53cf19ce8fb4ccc; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 45ec115cbfecb4b3cfab7fca6f73d1b60696a25a; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 041f57056e5fb9c80adc088269322d2c61074406
LinuxLinux2.6.12

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-89699?
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.
How severe is CVE-2026-89699?
CVE-2026-89699 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.45% probability of exploitation in the next 30 days.
How do I fix CVE-2026-89699?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

Related CVEs from 2026

View all 2026CVEs →

Are you affected by CVE-2026-89699?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST