CVE-2026-89696 Linux Kernel nfsd - Denial of Service

Linux kernel nfsd with CONFIG_NFSD_V4_2_INTER_SSC enabled contains a NULL pointer dereference caused by improper handling of FOREIGN PUTFH in nfsd4_putfh, letting remote clients cause a denial of service via crafted COMPOUND requests, exploit requires crafted inter-SSC COPY with inserted operations.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.75% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for this issue.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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