CVE-2023-53638

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

octeon_ep: cancel queued works in probe error path

If it fails to get the devicess MAC address, octep_probe exits while leaving the delayed work intr_poll_task queued. When the work later runs, its a use after free.

Move the cancelation of intr_poll_task from octep_remove into octep_device_cleanup. This does not change anything in the octep_remove flow, but octep_device_cleanup is called also in the octep_probe error path, where the cancelation is needed.

Note that the cancelation of ctrl_mbox_task has to follow intr_poll_tasks, because the ctrl_mbox_task may be queued by intr_poll_task.

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

Potential Mitigations

References

• https://git.kernel.org/stable/c/62312e2f6466b5f0a120542a38b410d88a34ed00
• https://git.kernel.org/stable/c/758c91078165ae641b698750a72eafe7968b3756