CVE-2026-23041

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> bnxt_en: Fix NULL pointer crash in bnxt_ptp_enable during error cleanup<br /> <br /> When bnxt_init_one() fails during initialization (e.g.,<br /> bnxt_init_int_mode returns -ENODEV), the error path calls<br /> bnxt_free_hwrm_resources() which destroys the DMA pool and sets<br /> bp-&gt;hwrm_dma_pool to NULL. Subsequently, bnxt_ptp_clear() is called,<br /> which invokes ptp_clock_unregister().<br /> <br /> Since commit a60fc3294a37 ("ptp: rework ptp_clock_unregister() to<br /> disable events"), ptp_clock_unregister() now calls<br /> ptp_disable_all_events(), which in turn invokes the driver&amp;#39;s .enable()<br /> callback (bnxt_ptp_enable()) to disable PTP events before completing the<br /> unregistration.<br /> <br /> bnxt_ptp_enable() attempts to send HWRM commands via bnxt_ptp_cfg_pin()<br /> and bnxt_ptp_cfg_event(), both of which call hwrm_req_init(). This<br /> function tries to allocate from bp-&gt;hwrm_dma_pool, causing a NULL<br /> pointer dereference:<br /> <br /> bnxt_en 0000:01:00.0 (unnamed net_device) (uninitialized): bnxt_init_int_mode err: ffffffed<br /> KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]<br /> Call Trace:<br /> __hwrm_req_init (drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c:72)<br /> bnxt_ptp_enable (drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c:323 drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c:517)<br /> ptp_disable_all_events (drivers/ptp/ptp_chardev.c:66)<br /> ptp_clock_unregister (drivers/ptp/ptp_clock.c:518)<br /> bnxt_ptp_clear (drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c:1134)<br /> bnxt_init_one (drivers/net/ethernet/broadcom/bnxt/bnxt.c:16889)<br /> <br /> Lines are against commit f8f9c1f4d0c7 ("Linux 6.19-rc3")<br /> <br /> Fix this by clearing and unregistering ptp (bnxt_ptp_clear()) before<br /> freeing HWRM resources.