CVE-2022-49535

/// Technical description

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

scsi: lpfc: Fix null pointer dereference after failing to issue FLOGI and PLOGI

If lpfc_issue_els_flogi() fails and returns non-zero status, the node

reference count is decremented to trigger the release of the nodelist

structure. However, if there is a prior registration or dev-loss-evt work

pending, the node may be released prematurely. When dev-loss-evt

completes, the released node is referenced causing a use-after-free null

pointer dereference.

Similarly, when processing non-zero ELS PLOGI completion status in

lpfc_cmpl_els_plogi(), the ndlp flags are checked for a transport

registration before triggering node removal. If dev-loss-evt work is

pending, the node may be released prematurely and a subsequent call to

lpfc_dev_loss_tmo_handler() results in a use after free ndlp dereference.

Add test for pending dev-loss before decrementing the node reference count

for FLOGI, PLOGI, PRLI, and ADISC handling.

/// 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