CVE-2024-26943: nouveau/dmem: handle kcalloc() allocation failure
First published: Wed May 01 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: nouveau/dmem: handle kcalloc() allocation failure The kcalloc() in nouveau_dmem_evict_chunk() will return null if the physical memory has run out. As a result, if we dereference src_pfns, dst_pfns or dma_addrs, the null pointer dereference bugs will happen. Moreover, the GPU is going away. If the kcalloc() fails, we could not evict all pages mapping a chunk. So this patch adds a __GFP_NOFAIL flag in kcalloc(). Finally, as there is no need to have physically contiguous memory, this patch switches kcalloc() to kvcalloc() in order to avoid failing allocations.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.1<6.1.84 | |
| Linux Kernel | >=6.2<6.6.24 | |
| Linux Kernel | >=6.7<6.7.12 | |
| Linux Kernel | >=6.8<6.8.3 | |
| Linux Kernel | =6.9-rc1 | |
| 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/16e87fe23d4af6df920406494ced5c0f4354567b
- https://git.kernel.org/stable/c/2a84744a037b8a511d6a9055f3defddc28ff4a4d
- https://git.kernel.org/stable/c/3e82f7383e0b82a835e6b6b06a348b2bc4e2c2ee
- https://git.kernel.org/stable/c/5e81773757a95fc298e96cfd6d4700f07b6192a2
- https://git.kernel.org/stable/c/9acfd8b083a0ffbd387566800d89f55058a68af2
- https://launchpad.net/bugs/cve/CVE-2024-26943
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26943
- https://nvd.nist.gov/vuln/detail/CVE-2024-26943
- https://security-tracker.debian.org/tracker/CVE-2024-26943
- https://ubuntu.com/security/CVE-2024-26943
- https://git.kernel.org/linus/16e87fe23d4af6df920406494ced5c0f4354567b
Frequently Asked Questions
What is the severity of CVE-2024-26943?
CVE-2024-26943 is classified as a high severity vulnerability due to the potential for dereferencing null pointers leading to crashes or undefined behavior.
How do I fix CVE-2024-26943?
To fix CVE-2024-26943, update your Linux kernel to one of the patched versions: 5.10.223-1, 5.10.226-1, 6.1.123-1, 6.1.119-1, or 6.12.10-1.
What software is affected by CVE-2024-26943?
CVE-2024-26943 affects the Linux kernel versions prior to those mentioned in the fixed versions, notably in Debian packages.
What are the consequences of not addressing CVE-2024-26943?
If CVE-2024-26943 is not addressed, systems may experience stability issues or crashes due to null pointer dereferencing.
Is CVE-2024-26943 under active exploit?
As of the latest information, there are no confirmed active exploits for CVE-2024-26943, but it is recommended to apply patches to mitigate potential risks.
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