ghsa-cchg-5m9c-jwh9
Vulnerability from github
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.
{
"affected": [],
"aliases": [
"CVE-2024-58091"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-03-27T15:15:54Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/fbdev-dma: Add shadow buffering for deferred I/O\n\nDMA areas are not necessarily backed by struct page, so we cannot\nrely on it for deferred I/O. Allocate a shadow buffer for drivers\nthat require deferred I/O and use it as framebuffer memory.\n\nFixes driver errors about being \"Unable to handle kernel NULL pointer\ndereference at virtual address\" or \"Unable to handle kernel paging\nrequest at virtual address\".\n\nThe patch splits drm_fbdev_dma_driver_fbdev_probe() in an initial\nallocation, which creates the DMA-backed buffer object, and a tail\nthat sets up the fbdev data structures. There is a tail function for\ndirect memory mappings and a tail function for deferred I/O with\nthe shadow buffer.\n\nIt is no longer possible to use deferred I/O without shadow buffer.\nIt can be re-added if there exists a reliably test for usable struct\npage in the allocated DMA-backed buffer object.",
"id": "GHSA-cchg-5m9c-jwh9",
"modified": "2025-07-06T12:30:24Z",
"published": "2025-03-27T15:31:10Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-58091"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0d087de947babf7ed70029d042abcc6ed06ff415"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3603996432997f7c88da37a97062a46cda01ac9d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cdc581169942de3b9e2648cfbd98c5ff9111c2c8"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
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