CVE-2026-64357

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux966ceafc7a437105ecfe1cadb3747b2965a260ca < c597c8580d50127fc1221b5a5b653a94d49e23e3affected
LinuxLinux966ceafc7a437105ecfe1cadb3747b2965a260ca < a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112affected
LinuxLinux966ceafc7a437105ecfe1cadb3747b2965a260ca < 4707344b0d36d1012c8a1716e20167cd3afdd5f1affected
LinuxLinux966ceafc7a437105ecfe1cadb3747b2965a260ca < 0a5213bbff62b51c7d4999ac8c7e11ea57d00d45affected
LinuxLinux6.10affected
LinuxLinux0 < 6.10unaffected
LinuxLinux6.12.96 <= 6.12.*unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References