CVE-2026-64357

Published: July 29, 2026Last modified: August 14, 2026

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.

Severity score breakdown

Status

References

• https://git.kernel.org/stable/c/0a5213bbff62b51c7d4999ac8c7e11ea57d00d45
• https://git.kernel.org/stable/c/4707344b0d36d1012c8a1716e20167cd3afdd5f1
• https://git.kernel.org/stable/c/a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112
• https://git.kernel.org/stable/c/c597c8580d50127fc1221b5a5b653a94d49e23e3