CVE-2025-23147

Summary

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

i3c: Add NULL pointer check in i3c_master_queue_ibi()

The I3C master driver may receive an IBI from a target device that has not been probed yet. In such cases, the master calls i3c_master_queue_ibi() to queue an IBI work task, leading to "Unable to handle kernel read from unreadable memory" and resulting in a kernel panic.

Typical IBI handling flow:

1. The I3C master scans target devices and probes their respective drivers.
2. The target device driver calls i3c_device_request_ibi() to enable IBI and assigns dev->ibi = ibi.
3. The I3C master receives an IBI from the target device and calls i3c_master_queue_ibi() to queue the target device driver’s IBI handler task.

However, since target device events are asynchronous to the I3C probe sequence, step 3 may occur before step 2, causing dev->ibi to be NULL, leading to a kernel panic.

Add a NULL pointer check in i3c_master_queue_ibi() to prevent accessing an uninitialized dev->ibi, ensuring stability.

Affected Software

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

• https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
• https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html

References

• https://git.kernel.org/stable/c/1b54faa5f47fa7c642179744aeff03f0810dc62e
• https://git.kernel.org/stable/c/09359e7c8751961937cb5fc50220969b0a4e1058
• https://git.kernel.org/stable/c/3ba402610843d7d15c7f3966a461deeeaff7fba4
• https://git.kernel.org/stable/c/d83b0c03ef8fbea2f03029a1cc1f5041f0e1d47f
• https://git.kernel.org/stable/c/6871a676aa534e8f218279672e0445c725f81026
• https://git.kernel.org/stable/c/e6bba328578feb58c614c11868c259b40484c5fa
• https://git.kernel.org/stable/c/fe4a4fc179b7898055555a11685915473588392e
• https://git.kernel.org/stable/c/ff9d61db59bb27d16d3f872bff2620d50856b80c
• https://git.kernel.org/stable/c/bd496a44f041da9ef3afe14d1d6193d460424e91

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