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CVE-2026-64392

Linux Kernel vulnerability

9.1 CRITICALEPSS 0.47%
  1. Published25 Jul 2026

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: use opener credentials for delete-on-close Delete-on-close can be completed by deferred or durable handle teardown, where no request work is available. Both the base-file unlink and the ADS xattr removal consequently run with the ksmbd worker credentials and can bypass filesystem permission checks. Run both operations with the credentials captured in struct file when the handle was opened. This preserves the authenticated user's fsuid, fsgid, supplementary groups and capability restrictions at final close.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

Linux Kernel≥ 5.15 < 6.6.145 · ≥ 6.13 < 6.18.39 · ≥ 6.19 < 7.1.4 · ≥ 6.7 < 6.12.96

Remediation

Fixed in
Linux Kernel≥ 6.6.145

References

Frequently asked

Is CVE-2026-64392 being actively exploited?

CVE-2026-64392 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.47%.

How severe is CVE-2026-64392?

CVE-2026-64392 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.47% probability of exploitation.

Which products are affected by CVE-2026-64392?

Affected products include Linux Kernel.

How do I fix CVE-2026-64392?

Upgrade affected software to a fixed version, for example Linux Kernel 6.6.145 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-64392 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.