CVE-2023-54048

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

RDMA/bnxt_re: Prevent handling any completions after qp destroy

HW may generate completions that indicates QP is destroyed.

Driver should not be scheduling any more completion handlers

for this QP, after the QP is destroyed. Since CQs are active

during the QP destroy, driver may still schedule completion

handlers. This can cause a race where the destroy_cq and poll_cq

running simultaneously.

Snippet of kernel panic while doing bnxt_re driver load unload in loop.

This indicates a poll after the CQ is freed. 

[77786.481636] Call Trace:

[77786.481640]  <TASK>

[77786.481644]  bnxt_re_poll_cq+0x14a/0x620 [bnxt_re]

[77786.481658]  ? kvm_clock_read+0x14/0x30

[77786.481693]  __ib_process_cq+0x57/0x190 [ib_core]

[77786.481728]  ib_cq_poll_work+0x26/0x80 [ib_core]

[77786.481761]  process_one_work+0x1e5/0x3f0

[77786.481768]  worker_thread+0x50/0x3a0

[77786.481785]  ? __pfx_worker_thread+0x10/0x10

[77786.481790]  kthread+0xe2/

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References