CVE-2026-64357 Details
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.
A vulnerability in the Linux kernel's XFS file system has been addressed. The issue arose in the function 'xfs_exchmaps_estimate_overhead()', which incorrectly handled block reservation limits. The function added overhead values to a local reservation variable but failed to properly check the updated value against the maximum limit before storing it back in the request. This oversight could lead to improper block reservations being passed to transaction allocation, potentially causing issues in file mapping exchanges.
Users can apply the latest patches available in the Linux kernel stable tree to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/0a5213bbff62b51c7d4999ac8c7e11ea57d00d45 | kernel.org | Patch |
| https://git.kernel.org/stable/c/4707344b0d36d1012c8a1716e20167cd3afdd5f1 | kernel.org | Patch |
| https://git.kernel.org/stable/c/a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112 | kernel.org | Patch |
| https://git.kernel.org/stable/c/c597c8580d50127fc1221b5a5b653a94d49e23e3 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.10, < 6.12.96 >= 6.13, < 6.18.39 >= 6.19, < 7.1.4 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 4, 2026 | Initial Analysis | [email protected] |
| Aug 17, 2026 | CVE Modified | kernel.org |
| Jul 25, 2026 | New CVE Received | kernel.org |