CVE-2026-89704 Linux Kernel nfsd - Silent Data Loss

Linux kernel contains a silent data loss vulnerability in nfsd due to improper sampling of writeback error cursor in nfsd_copy_file_range, letting attackers cause undetected writeback failures during async COPY operations, exploit requires concurrent COMMIT or stable WRITE on destination file.

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
Silent Data Loss
Impact
Data Tampering
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 latest Linux kernel version containing the fix.

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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