Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: fgraph: Add READ_ONCE() when accessing fgraph_array[] In __ftrace_return_to_handler(), a loop iterates over the fgraph_array[] elements, which are fgraph_ops. The loop checks if an element is a fgraph_stub to prevent using a fgraph_stub afterward. However, if the compiler reloads fgraph_array[] after this check, it might race with an update to fgraph_array[] that introduces a fgraph_stub. This could result in the stub being processed, but the stub contains a null "func_hash" field, leading to a NULL pointer dereference. To ensure that the gops compared against the fgraph_stub matches the gops processed later, add a READ_ONCE(). A similar patch appears in commit 63a8dfb ("function_graph: Add READ_ONCE() when accessing fgraph_array[]").
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 37238abe3cb47b8daaa8706c9949f67b2a705cf1 before b68b2a3fbacc7be720ef589d489bcacdd05c6d38; affected 37238abe3cb47b8daaa8706c9949f67b2a705cf1 before d65474033740ded0a4fe9a097fce72328655b41d |
| Linux / Linux | affected 6.11; unaffected 0 before 6.11; unaffected 6.12.9 through 6.12.*; unaffected 6.13 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/b68b2a3fbacc7be720ef589d489bcacdd05c6d38
- https://git.kernel.org/stable/c/d65474033740ded0a4fe9a097fce72328655b41d
ADP enrichment
No English description supplied.
No references supplied.