CVE-2023-53530: 
Linux Kernel vulnerability analysis and mitigation

In the Linux kernel, a vulnerability has been identified and resolved involving the improper use of smpprocessorid() instead of rawsmpprocessorid() in the qla2xxx SCSI driver. The issue was discovered when a call trace was observed during NVME-FC controller connection, showing the use of smpprocessor_id() in preemptible code (NVD).

The vulnerability manifests in the qlanvmepostcmd function of the qla2xxx driver, where smpprocessorid() was incorrectly used in preemptible code. The issue occurs specifically when CONFIGDEBUGPREEMPT is enabled. The fix involves replacing smpprocessorid() with rawsmpprocessorid() and modifying the driver to use queuework() instead of queueworkon() to avoid smpprocessor_id() usage in preemptible contexts (NVD).

When triggered, this vulnerability can cause system instability and potential crashes, as evidenced by the BUG warning message observed in the kernel logs. The issue affects systems running the Linux kernel with the qla2xxx driver, particularly in configurations using NVME-FC storage (NVD).

The vulnerability has been addressed through a kernel patch that replaces smpprocessorid() with rawsmpprocessorid() and modifies the queuework implementation. Users should update to the patched version of the Linux kernel to mitigate this issue (NVD).