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: <TASK> 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.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | debian-upgrade-linux | Jun 20, 2025 | Jun 20, 2025 | |
| Redhat_linux | — | no-fix-redhat-rpm-package | Jul 9, 2025 | Jun 18, 2025 |
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