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Vulnerability record · CVE-2026-64392 · published 25 July 2026

CVE-2026-64392: Linux kernel vulnerability

Linux · Linux Kernel

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.

9.1 CVSS 3.1 Critical EPSS 0.47% · top 61.9%
9.1CVSS 3.1 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
4 Sep 2026Last modified by NVD

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/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/18c59109bb6fb816d5102171666f87cf1e29901d Patch
https://git.kernel.org/stable/c/4b7059974549d278e30fe70e2a4e421f9839817d Patch
https://git.kernel.org/stable/c/52e2f21911158ec961cd5aae19c56460db382af0 Patch
https://git.kernel.org/stable/c/e72c15085b6d86f45d224d98aa75b5cace4aaab9 Patch
https://git.kernel.org/stable/c/f08b3f451f12eee4abd8a5981803bc36db84458b Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64392), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.