Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mm/mempolicy: fix memory leaks in weighted_interleave_auto_store() weighted_interleave_auto_store() fetches old_wi_state inside the if (!input) block only. This causes two memory leaks: 1. When a user writes "false" and the current mode is already manual, the function returns early without freeing the freshly allocated new_wi_state. 2. When a user writes "true", old_wi_state stays NULL because the fetch is skipped entirely. The old state is then overwritten by rcu_assign_pointer() but never freed, since the cleanup path is gated on old_wi_state being non-NULL. A user can trigger this repeatedly by writing "1" in a loop. Fix both leaks by moving the old_wi_state fetch before the input check, making it unconditional. This also allows a unified early return for both "true" and "false" when the requested mode matches the current mode. Reviewed by: Donet Tom <[email protected]>
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.16, < 6.18.27 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/39caa9ca863f96b3d00447c5aa200cabda489856Patch
- https://git.kernel.org/stable/c/6fae274ce0e3109cbbc4c18b354eaace1f0af7d7Patch
- https://git.kernel.org/stable/c/c42a7efb9060d89b72708ffaf255d0002c2164a7Patch
FAQ
What is CVE-2026-46042?
CVE-2026-46042 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: mm/mempolicy: fix memory leaks in weighted_interleave_auto_store() weighted_interleave_auto_store() fetches old_wi_state inside th...
How severe is CVE-2026-46042?
CVE-2026-46042 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-46042?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.