Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/fbdev-dma: Add shadow buffering for deferred I/O DMA areas are not necessarily backed by struct page, so we cannot rely on it for deferred I/O. Allocate a shadow buffer for drivers that require deferred I/O and use it as framebuffer memory. Fixes driver errors about being "Unable to handle kernel NULL pointer dereference at virtual address" or "Unable to handle kernel paging request at virtual address". The patch splits drm_fbdev_dma_driver_fbdev_probe() in an initial allocation, which creates the DMA-backed buffer object, and a tail that sets up the fbdev data structures. There is a tail function for direct memory mappings and a tail function for deferred I/O with the shadow buffer. It is no longer possible to use deferred I/O without shadow buffer. It can be re-added if there exists a reliably test for usable struct page in the allocated DMA-backed buffer object.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.11, < 6.12.36 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/0d087de947babf7ed70029d042abcc6ed06ff415Patch
- https://git.kernel.org/stable/c/3603996432997f7c88da37a97062a46cda01ac9dPatch
- https://git.kernel.org/stable/c/cdc581169942de3b9e2648cfbd98c5ff9111c2c8Patch
FAQ
What is CVE-2024-58091?
CVE-2024-58091 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: drm/fbdev-dma: Add shadow buffering for deferred I/O DMA areas are not necessarily backed by struct page, so we cannot rely on it ...
How severe is CVE-2024-58091?
CVE-2024-58091 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-2024-58091?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.