CVE-2024-46842

/// Technical description

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

scsi: lpfc: Handle mailbox timeouts in lpfc_get_sfp_info

The MBX_TIMEOUT return code is not handled in lpfc_get_sfp_info and the

routine unconditionally frees submitted mailbox commands regardless of

return status. The issue is that for MBX_TIMEOUT cases, when firmware

returns SFP information at a later time, that same mailbox memory region

references previously freed memory in its cmpl routine.

Fix by adding checks for the MBX_TIMEOUT return code. During mailbox

resource cleanup, check the mbox flag to make sure that the wait did not

timeout. If the MBOX_WAKE flag is not set, then do not free the resources

because it will be freed when firmware completes the mailbox at a later

time in its cmpl routine.

Also, increase the timeout from 30 to 60 seconds to accommodate boot

scripts requiring longer timeouts.

/// 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