n the Linux kernel, the following vulnerability has been resolved: ksmbd: Fix race condition in RPC handle list access The 'sess->rpc_handle_list' XArray manages RPC handles within a ksmbd session. Access to this list is intended to be protected by 'sess->rpc_lock' (an rw_semaphore). However, the locking implementation was flawed, leading to potential race conditions. In ksmbd_session_rpc_open(), the code incorrectly acquired only a read lock before calling xa_store() and xa_erase(). Since these operations modify the XArray structure, a write lock is required to ensure exclusive access and prevent data corruption from concurrent modifications. Furthermore, ksmbd_session_rpc_method() accessed the list using xa_load() without holding any lock at all. This could lead to reading inconsistent data or a potential use-after-free if an entry is concurrently removed and the pointer is dereferenced. Fix these issues by: 1. Using down_write() and up_write() in ksmbd_session_rpc_open() to ensure exclusive access during XArray modification, and ensuring the lock is correctly released on error paths. 2. Adding down_read() and up_read() in ksmbd_session_rpc_method() to safely protect the lookup.
Configuration 1 (hide)
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26 Feb 2026, 15:50
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-362 | |
| First Time |
Linux linux Kernel
Linux |
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| References | () https://git.kernel.org/stable/c/305853cce379407090a73b38c5de5ba748893aee - Patch | |
| References | () https://git.kernel.org/stable/c/5cc679ba0f4505936124cd4179ba66bb0a4bd9f3 - Patch | |
| References | () https://git.kernel.org/stable/c/69674b029002b1d90b655f014bdf64f404efa54d - Patch | |
| References | () https://git.kernel.org/stable/c/6b615a8fb3af0baf8126cde3d4fee97d57222ffc - Patch | |
| References | () https://git.kernel.org/stable/c/6bd7e0e55dcea2cf0d391bbc21c2eb069b4be3e1 - Patch | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 4.7 |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
06 Feb 2026, 17:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
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28 Oct 2025, 12:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Published : 2025-10-28 12:15
Updated : 2026-02-26 15:50
NVD link : CVE-2025-40039
Mitre link : CVE-2025-40039
CVE.ORG link : CVE-2025-40039
JSON object : View
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')