CVE-2026-43379
ksmbd Use-After-Free in Linux Kernel
Publication date: 2026-05-08
Last updated on: 2026-05-08
Assigner: kernel.org
Description
Description
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linux | linux_kernel | * |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a use-after-free issue in the Linux kernel's ksmbd component, specifically in the smb_lazy_parent_lease_break_close() function.
The problem occurs because an opinfo pointer, obtained via rcu_dereference(fp->f_opinfo), is accessed after rcu_read_unlock() has been called. This creates a race condition where the memory pointed to by opinfo could be freed by another concurrent process before it is accessed, leading to use-after-free errors.
How can this vulnerability impact me? :
The use-after-free vulnerability can lead to undefined behavior such as system crashes, data corruption, or potential execution of arbitrary code if exploited.
Because it involves a race condition in kernel memory management, an attacker might exploit this to cause denial of service or escalate privileges on the affected system.