CVE-2024-44932: idpf: fix UAFs when destroying the queues
First published: Mon Aug 26 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: idpf: fix UAFs when destroying the queues The second tagged commit started sometimes (very rarely, but possible) throwing WARNs from net/core/page_pool.c:page_pool_disable_direct_recycling(). Turned out idpf frees interrupt vectors with embedded NAPIs *before* freeing the queues making page_pools' NAPI pointers lead to freed memory before these pools are destroyed by libeth. It's not clear whether there are other accesses to the freed vectors when destroying the queues, but anyway, we usually free queue/interrupt vectors only when the queues are destroyed and the NAPIs are guaranteed to not be referenced anywhere. Invert the allocation and freeing logic making queue/interrupt vectors be allocated first and freed last. Vectors don't require queues to be present, so this is safe. Additionally, this change allows to remove that useless queue->q_vector pointer cleanup, as vectors are still valid when freeing the queues (+ both are freed within one function, so it's not clear why nullify the pointers at all).
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.7<6.10.5 | |
| Linux Kernel | =6.11-rc1 | |
| Linux Kernel | =6.11-rc2 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2024-44932?
CVE-2024-44932 has been classified as a medium-severity vulnerability in the Linux kernel.
What versions of the Linux kernel are affected by CVE-2024-44932?
CVE-2024-44932 affects Linux kernel versions from 6.7 up to and including 6.10.5, as well as the specific release candidates 6.11-rc1 and 6.11-rc2.
How do I fix CVE-2024-44932?
To fix CVE-2024-44932, you should update your Linux kernel to a version that is not affected, such as versions higher than 6.10.5.
What is the nature of the vulnerability CVE-2024-44932?
CVE-2024-44932 addresses a use-after-free vulnerability in the idpf subsystem during queue destruction processes in the Linux kernel.
Are there any immediate mitigations for CVE-2024-44932?
While the best mitigation for CVE-2024-44932 is an upgrade to a patched version of the kernel, ensuring minimal exposure and monitoring your system can provide additional protection.
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