ghsa-q8cf-83hq-3865
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
vdpa_sim_blk: set number of address spaces and virtqueue groups
Commit bda324fd037a ("vdpasim: control virtqueue support") added two new fields (nas, ngroups) to vdpasim_dev_attr, but we forgot to initialize them for vdpa_sim_blk.
When creating a new vdpa_sim_blk device this causes the kernel to panic in this way: $ vdpa dev add mgmtdev vdpasim_blk name blk0 BUG: kernel NULL pointer dereference, address: 0000000000000030 ... RIP: 0010:vhost_iotlb_add_range_ctx+0x41/0x220 [vhost_iotlb] ... Call Trace: vhost_iotlb_add_range+0x11/0x800 [vhost_iotlb] vdpasim_map_range+0x91/0xd0 [vdpa_sim] vdpasim_alloc_coherent+0x56/0x90 [vdpa_sim] ...
This happens because vdpasim->iommu[0] is not initialized when dev_attr.nas is 0.
Let's fix this issue by initializing both (nas, ngroups) to 1 for vdpa_sim_blk.
{
"affected": [],
"aliases": [
"CVE-2022-50058"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-06-18T11:15:34Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvdpa_sim_blk: set number of address spaces and virtqueue groups\n\nCommit bda324fd037a (\"vdpasim: control virtqueue support\") added two\nnew fields (nas, ngroups) to vdpasim_dev_attr, but we forgot to\ninitialize them for vdpa_sim_blk.\n\nWhen creating a new vdpa_sim_blk device this causes the kernel\nto panic in this way:\n \u00a0 \u00a0$ vdpa dev add mgmtdev vdpasim_blk name blk0\n \u00a0 \u00a0BUG: kernel NULL pointer dereference, address: 0000000000000030\n \u00a0 \u00a0...\n \u00a0 \u00a0RIP: 0010:vhost_iotlb_add_range_ctx+0x41/0x220 [vhost_iotlb]\n \u00a0 \u00a0...\n \u00a0 \u00a0Call Trace:\n \u00a0 \u00a0 \u003cTASK\u003e\n \u00a0 \u00a0 vhost_iotlb_add_range+0x11/0x800 [vhost_iotlb]\n \u00a0 \u00a0 vdpasim_map_range+0x91/0xd0 [vdpa_sim]\n \u00a0 \u00a0 vdpasim_alloc_coherent+0x56/0x90 [vdpa_sim]\n \u00a0 \u00a0 ...\n\nThis happens because vdpasim-\u003eiommu[0] is not initialized when\ndev_attr.nas is 0.\n\nLet\u0027s fix this issue by initializing both (nas, ngroups) to 1 for\nvdpa_sim_blk.",
"id": "GHSA-q8cf-83hq-3865",
"modified": "2025-06-18T12:30:45Z",
"published": "2025-06-18T12:30:45Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50058"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/19cd4a5471b8eaa4bd161b0fdb4567f2fc88d809"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a291c7d289fac2cb13fb2614a9a251afbbd86ce9"
}
],
"schema_version": "1.4.0",
"severity": []
}
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