CVE-2026-64357

Unspecified impact via stale reservation limit check

Published Jul 25, 2026 · Updated Jul 25, 2026

Integer overflow in the XFS exchange-mapping code in Linux Kernel allows attackers to cause unspecified impact via unspecified vectors. xfs_exchmaps_estimate_overhead() adds bmbt and rmapbt overhead to a local reservation value but checks the earlier req->resblks value against UINT_MAX before storing the computed value for an unsigned-int transaction reservation. The public record does not state the privileges or filesystem conditions needed to reach this path or identify a resulting security consequence.

CVSS severityUnavailable
Unscored
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in the XFS exchange-mapping code in Linux Kernel allows attackers to cause unspecified impact via unspecified vectors. xfs_exchmaps_estimate_overhead() adds bmbt and rmapbt overhead to a local reservation value but checks the earlier req->resblks value against UINT_MAX before storing the computed value for an unsigned-int transaction reservation. The public record does not state the privileges or filesystem conditions needed to reach this path or identify a resulting security consequence.

The record

CVE
CVE-2026-64357
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.10
  2. Affected versionversion=966ceafc7a437105ecfe1cadb3747b2965a260ca <0a5213bbff62b51c7d4999ac8c7e11ea57d00d45
  3. Affected versionversion=966ceafc7a437105ecfe1cadb3747b2965a260ca <4707344b0d36d1012c8a1716e20167cd3afdd5f1
  4. Affected versionversion=966ceafc7a437105ecfe1cadb3747b2965a260ca <a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112
  5. Affected versionversion=966ceafc7a437105ecfe1cadb3747b2965a260ca <c597c8580d50127fc1221b5a5b653a94d49e23e3

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.10; version=966ceafc7a437105ecfe1cadb3747b2965a260ca <0a5213bbff62b51c7d4999ac8c7e11ea57d00d45; version=966ceafc7a437105ecfe1cadb3747b2965a260ca <4707344b0d36d1012c8a1716e20167cd3afdd5f1; version=966ceafc7a437105ecfe1cadb3747b2965a260ca <a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112; version=966ceafc7a437105ecfe1cadb3747b2965a260ca <c597c8580d50127fc1221b5a5b653a94d49e23e3

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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