CVE-2023-53201

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

RDMA/bnxt_re: wraparound mbox producer index

Driver is not handling the wraparound of the mbox producer index correctly. Currently the wraparound happens once u32 max is reached.

Bit 31 of the producer index register is special and should be set only once for the first command. Because the producer index overflow setting bit31 after a long time, FW goes to initialization sequence and this causes FW hang.

Fix is to wraparound the mbox producer index once it reaches u16 max.

The issue in the Broadcom bnxt_re RDMA driver was caused by incorrect handling of the mailbox producer index wraparound, which could eventually trigger firmware reinitialization. This results in a denial of service condition (firmware hang) but does not provide memory corruption or code execution capabilities. The flaw is only relevant on systems actively using the bnxt_re driver under sustained RDMA workloads.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.