CVE-2026-64357

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

xfs: fix exchmaps reservation limit check

xfs_exchmaps_estimate_overhead() adds the bmbt and rmapbt

overhead to a local resblks variable, but the final UINT_MAX

check still tests req->resblks. That is the reservation value

from before the overhead was added.

The computed value is stored back in req->resblks and later passed

to xfs_trans_alloc(), whose block reservation argument is unsigned

int. Check the computed reservation so the existing limit applies

to the value that will be used.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References