CVE-2026-98974 Linux Kernel XFS - Broken Access Control

Linux kernel XFS filesystem contains a broken access control vulnerability caused by incorrect handling of file sizes in XFS_IOC_EXCHANGE_RANGE's TO_EOF flag, letting attackers modify shared blocks beyond EOF, exploit requires reflink and exchange-range enabled filesystem.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.21% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Data Tampering
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
23 October 2026
Updated
25 October 2026

Vendor fix

Update to the Linux kernel version containing the patch that fixes XFS_IOC_EXCHANGE_RANGE TO_EOF file size handling.

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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