Medium 5.5Published Jul 25, 2026

CVE-2026-64357xfs: fix exchmaps reservation limit check

Updated under an hour ago (Oct 27, 2026, 4:50 PM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Aug 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 966ceafc7a437105ecfe1cadb3747b2965a260ca before c597c8580d50127fc1221b5a5b653a94d49e23e3; from 966ceafc7a437105ecfe1cadb3747b2965a260ca before a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112; from 966ceafc7a437105ecfe1cadb3747b2965a260ca before 4707344b0d36d1012c8a1716e20167cd3afdd5f1; 966ceafc7a437105ecfe1cadb3747b2965a260ca builds before 0a5213bbff62b51c7d4999ac8c7e11ea57d00d45	CNA record
linux linux_kernel linux:linux_kernel	from 6.10 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.