CVE-2024-57934: fgraph: Add READ_ONCE() when accessing fgraph_array[]
First published: Tue Jan 21 2025(Updated: )
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[]").
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=6.11<6.12.9 | |
| Linux Kernel | =6.13-rc1 | |
| Linux Kernel | =6.13-rc2 | |
| Linux Kernel | =6.13-rc3 | |
| Linux Kernel | =6.13-rc4 | |
| Linux Kernel | =6.13-rc5 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.135-1 6.12.22-1 6.12.25-1 |
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Reference Links
- https://git.kernel.org/stable/c/b68b2a3fbacc7be720ef589d489bcacdd05c6d38
- https://git.kernel.org/stable/c/d65474033740ded0a4fe9a097fce72328655b41d
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-57934
- https://nvd.nist.gov/vuln/detail/CVE-2024-57934
- https://launchpad.net/bugs/cve/CVE-2024-57934
- https://security-tracker.debian.org/tracker/CVE-2024-57934
- https://ubuntu.com/security/CVE-2024-57934
- https://git.kernel.org/linus/d65474033740ded0a4fe9a097fce72328655b41d
Frequently Asked Questions
What is the severity of CVE-2024-57934?
CVE-2024-57934 is considered a moderate severity vulnerability in the Linux kernel.
How do I fix CVE-2024-57934?
To fix CVE-2024-57934, update the Linux kernel to the latest stable version that contains the patch.
What systems are affected by CVE-2024-57934?
CVE-2024-57934 affects the Linux kernel across multiple distributions that utilize this version.
Can CVE-2024-57934 be exploited remotely?
CVE-2024-57934 does not appear to be exploitable remotely as it requires local access to the system.
What impact does CVE-2024-57934 have on system security?
CVE-2024-57934 could potentially lead to unauthorized access to sensitive data or system resources.
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