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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/0a5213bbff62b51c7d4999ac8c7e11ea57d00d45 cve-icon
https://git.kernel.org/stable/c/4707344b0d36d1012c8a1716e20167cd3afdd5f1 cve-icon
https://git.kernel.org/stable/c/a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112 cve-icon
https://git.kernel.org/stable/c/c597c8580d50127fc1221b5a5b653a94d49e23e3 cve-icon
https://lore.kernel.org/linux-cve-announce/2026072519-CVE-2026-64357-8c69@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-64357 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-64357 cve-icon
History

Sat, 01 Aug 2026 02:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-680

Wed, 29 Jul 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-190
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Mon, 27 Jul 2026 06:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-680

Sat, 25 Jul 2026 09:30:00 +0000

Type Values Removed Values Added
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.
Title xfs: fix exchmaps reservation limit check
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-07-25T08:50:14.676Z

Updated: 2026-07-25T08:50:14.676Z

Reserved: 2026-07-19T15:36:31.782Z

Link: CVE-2026-64357

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-07-25T00:00:00Z

Links: CVE-2026-64357 - Bugzilla