CVE-2024-40963: mips: bmips: BCM6358: make sure CBR is correctly set

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-07-12 · updated 2026-06-17
Weakness: CWE-754

Description

In the Linux kernel, the following vulnerability has been resolved: mips: bmips: BCM6358: make sure CBR is correctly set It was discovered that some device have CBR address set to 0 causing kernel panic when arch_sync_dma_for_cpu_all is called. This was notice in situation where the system is booted from TP1 and BMIPS_GET_CBR() returns 0 instead of a valid address and !!(read_c0_brcm_cmt_local() & (1 << 31)); not failing. The current check whether RAC flush should be disabled or not are not enough hence lets check if CBR is a valid address or not.

Affected products

Linux kernel: from 5.4.240 before 5.4.279; from 5.10.177 before 5.10.221; from 5.15.106 before 5.15.162; from 6.1.23 before 6.1.96; from 6.2.10 before 6.3; from 6.3.1 before 6.6.36 — fixed in 5.10.221, 5.15.162, 5.4.279, 6.1.96, 6.3, 6.6.36

How to fix

Upgrade to a fixed version: Linux kernel 5.10.221, 5.15.162, 5.4.279, 6.1.96. Check the vendor advisory for mitigations.

References

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