CVE-2026-89678 Linux Kernel - Data Tampering

Linux kernel contains a data tampering vulnerability in nfsd_direct_write caused by incorrect partial-write detection, letting attackers cause file offset corruption and data over-reporting, exploit requires NFS client interaction.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.38% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Data Tampering
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 for nfsd_direct_write partial-write detection.

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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