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Medium severity5.5NVD Advisory· Published Jul 25, 2026· Updated Sep 4, 2026

CVE-2026-64357

CVE-2026-64357

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.

Affected products

16

Patches

Vulnerability mechanics

References

4

News mentions

0

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