CVE-2026-43215 Details
Description
In the Linux kernel, the following vulnerability has been resolved: cifs: Fix locking usage for tcon fields We used to use the cifs_tcp_ses_lock to protect a lot of objects that are not just the server, ses or tcon lists. We later introduced srv_lock, ses_lock and tc_lock to protect fields within the corresponding structs. This was done to provide a more granular protection and avoid unnecessary serialization. There were still a couple of uses of cifs_tcp_ses_lock to provide tcon fields. In this patch, I've replaced them with tc_lock.
A vulnerability in the Linux kernel's CIFS (Common Internet File System) implementation has been addressed. The issue involved improper locking mechanisms for connection (tcon) fields, which could lead to concurrency problems. Previously, a broad lock was used, causing unnecessary delays. The vulnerability affected several versions of the Linux kernel.
Users can upgrade to the latest version of the Linux kernel, where this vulnerability has been fixed. Instructions for upgrading the kernel can be found in the official Linux kernel documentation.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/3969db6b22e3d90d8c5f22ac1a7fe0350a94c136 | kernel.org | Patch |
| https://git.kernel.org/stable/c/601dd3b79769b38d30b693c40afdb2a4b7edf9d0 | kernel.org | Patch |
| https://git.kernel.org/stable/c/8c59eeeeffa1524ef57e173a89a1a3ff539888d5 | kernel.org | Patch |
| https://git.kernel.org/stable/c/953953abb66e52c224057ab91e404284fefeab62 | kernel.org | Patch |
| https://git.kernel.org/stable/c/96c4af418586ee9a6aab61738644366426e05316 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-667 | Improper Locking | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.0, < 6.6.128 >= 6.7, < 6.12.75 >= 6.13, < 6.18.16 >= 6.19, < 6.19.6 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 11, 2026 | Initial Analysis | [email protected] |
| May 8, 2026 | CVE Modified | kernel.org |
| May 6, 2026 | New CVE Received | kernel.org |