CVE-2026-89706 Linux kernel nfsd - Broken Access Control

Linux kernel nfsd contains a broken access control vulnerability caused by failure to reset write verifier on async COPY writeback failure, letting NFS clients incorrectly assume data durability, exploit requires NFS client interaction.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.53% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the Linux kernel version containing the fix for async COPY writeback failure.

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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