In 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.
References
Configurations
Configuration 1 (hide)
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History
26 Feb 2026, 15:50
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Linux
Linux linux Kernel |
|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| CWE | CWE-362 | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 4.7 |
| 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 |
06 Feb 2026, 17:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
28 Oct 2025, 12:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
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
Products Affected
linux
- linux_kernel
CWE
CWE-362
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')