CVE-2026-43378
Modified Modified - Updated After Analysis
Linux Kernel SMB Server Use-After-Free Vulnerability

Publication date: 2026-05-08

Last updated on: 2026-05-20

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: smb: server: fix use-after-free in smb2_open() The opinfo pointer obtained via rcu_dereference(fp->f_opinfo) is dereferenced after rcu_read_unlock(), creating a use-after-free window.
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Meta Information
Published
2026-05-08
Last Modified
2026-05-20
Generated
2026-06-19
AI Q&A
2026-05-08
EPSS Evaluated
2026-06-18
NVD
CVE-2026-43378
EUVD
EUVD-2026-28684
Affected Vendors & Products
Showing 8 associated CPEs
Vendor Product Version / Range
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel From 6.2 (inc) to 6.6.130 (exc)
linux linux_kernel From 6.13 (inc) to 6.18.19 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.78 (exc)
linux linux_kernel From 6.19 (inc) to 6.19.9 (exc)
linux linux_kernel From 5.15 (inc) to 6.1.167 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
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Executive Summary

This vulnerability is a use-after-free issue in the Linux kernel's SMB server component, specifically in the smb2_open() function.

The problem occurs because a pointer named opinfo, which is obtained via rcu_dereference(fp->f_opinfo), is accessed after the rcu_read_unlock() call. This creates a window where the pointer may reference freed memory, leading to a use-after-free condition.

Impact Analysis

A use-after-free vulnerability can lead to unpredictable behavior including system crashes, data corruption, or potential execution of arbitrary code by an attacker.

In this case, since it affects the SMB server in the Linux kernel, an attacker might exploit this flaw to compromise the server's stability or security, potentially gaining unauthorized access or causing denial of service.

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