Riskcovery

CVE-2022-50058

vdpa_sim_blk: set number of address spaces and virtqueue groups

State
Published
Severity
Not scored
Published
Jun 18, 2025
Updated
May 11, 2026
Reserved
Jun 18, 2025

Read the record on cve.org

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • bda324fd037a6b0d44da5699574ce741ca161bc4 to before a291c7d289fac2cb13fb2614a9a251afbbd86ce9Affected
  • bda324fd037a6b0d44da5699574ce741ca161bc4 to before 19cd4a5471b8eaa4bd161b0fdb4567f2fc88d809Affected
LinuxLinux
  • 5.19Affected
  • before 5.19Not affected
  • 5.19.4 through 5.19.*Not affected
  • 6.0 and laterNot affected

References

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