CVE-2026-64357
xfs: fix exchmaps reservation limit check
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.
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
Aug. 17, 2026, 5:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel.
- Apply the xfs reservation limit fix.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64357.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64357 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64357
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64357 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64357 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '966ceafc7a437105ecfe1cadb3747b2965a260ca', 'lessThan': 'c597c8580d50127fc1221b5a5b653a94d49e23e3', 'versionType': 'git'}, {'status': 'affected', 'version': '966ceafc7a437105ecfe1cadb3747b2965a260ca', 'lessThan': 'a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112', 'versionType': 'git'}, {'status': 'affected', 'version': '966ceafc7a437105ecfe1cadb3747b2965a260ca', 'lessThan': '4707344b0d36d1012c8a1716e20167cd3afdd5f1', 'versionType': 'git'}, {'status': 'affected', 'version': '966ceafc7a437105ecfe1cadb3747b2965a260ca', 'lessThan': '0a5213bbff62b51c7d4999ac8c7e11ea57d00d45', 'versionType': 'git'}], 'programFiles': ['fs/xfs/libxfs/xfs_exchmaps.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.10'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.10', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/xfs/libxfs/xfs_exchmaps.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '966ceafc7a437105ecfe1cadb3747b2965a260ca', 'lessThan': 'c597c8580d50127fc1221b5a5b653a94d49e23e3', 'versionType': 'git'}, {'status': 'affected', 'version': '966ceafc7a437105ecfe1cadb3747b2965a260ca', 'lessThan': 'a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112', 'versionType': 'git'}, {'status': 'affected', 'version': '966ceafc7a437105ecfe1cadb3747b2965a260ca', 'lessThan': '4707344b0d36d1012c8a1716e20167cd3afdd5f1', 'versionType': 'git'}, {'status': 'affected', 'version': '966ceafc7a437105ecfe1cadb3747b2965a260ca', 'lessThan': '0a5213bbff62b51c7d4999ac8c7e11ea57d00d45', 'versionType': 'git'}], 'programFiles': ['fs/xfs/libxfs/xfs_exchmaps.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.10'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.10', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/xfs/libxfs/xfs_exchmaps.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '966ceafc7a437105ecfe1cadb3747b2965a260ca', 'lessThan': 'c597c8580d50127fc1221b5a5b653a94d49e23e3', 'versionType': 'git'}, {'status': 'affected', 'version': '966ceafc7a437105ecfe1cadb3747b2965a260ca', 'lessThan': 'a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112', 'versionType': 'git'}, {'status': 'affected', 'version': '966ceafc7a437105ecfe1cadb3747b2965a260ca', 'lessThan': '4707344b0d36d1012c8a1716e20167cd3afdd5f1', 'versionType': 'git'}, {'status': 'affected', 'version': '966ceafc7a437105ecfe1cadb3747b2965a260ca', 'lessThan': '0a5213bbff62b51c7d4999ac8c7e11ea57d00d45', 'versionType': 'git'}], 'programFiles': ['fs/xfs/libxfs/xfs_exchmaps.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.10'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.10', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['fs/xfs/libxfs/xfs_exchmaps.c'], 'defaultStatus': 'affected'}] 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. Added Reference https://git.kernel.org/stable/c/0a5213bbff62b51c7d4999ac8c7e11ea57d00d45 Added Reference https://git.kernel.org/stable/c/4707344b0d36d1012c8a1716e20167cd3afdd5f1 Added Reference https://git.kernel.org/stable/c/a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112 Added Reference https://git.kernel.org/stable/c/c597c8580d50127fc1221b5a5b653a94d49e23e3