Vulnerability Details CVE-2022-50058
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 4.3%
CVSS Severity
CVSS v3 Score 5.5
References
Products affected by CVE-2022-50058
-
cpe:2.3:o:linux:linux_kernel:5.19
-
cpe:2.3:o:linux:linux_kernel:5.19.1
-
cpe:2.3:o:linux:linux_kernel:5.19.2
-
cpe:2.3:o:linux:linux_kernel:5.19.3