CVE-2023-54014

Vulnerability

CVE-2023-54014 is a null-pointer dereference vulnerability in the Linux kernel's qla2xxx SCSI driver. The issue was identified by Klocwork static analysis, which warned that the rport pointer returned by the fc_bsg_to_rport() function could be NULL and subsequently dereferenced without a proper check [1][2][3].

Exploitation

An attacker with the ability to trigger the vulnerable code path in the qla2xxx driver, likely through a crafted Fibre Channel (FC) request via the BSG (block SCSI generic) interface. No authentication is required beyond the ability to send such requests to the driver. The attack surface is limited to systems with the qla2xxx driver loaded and accessible to unprivileged users or remote attackers who can send FC frames.

Impact

If successfully exploited, this bug could cause a kernel crash (denial of service) due to dereferencing a NULL pointer. In some configurations, it might be leveraged for privilege escalation if the NULL pointer dereference occurs in a context where an attacker can control the memory layout. However, the primary impact is system instability and denial of service.

Mitigation

The fix is included in the Linux kernel stable updates. Patches are available in the kernel git repository [1][2][3]. Users should apply the latest kernel updates from their distribution to remediate this vulnerability.