CVE-2024-56623

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> scsi: qla2xxx: Fix use after free on unload<br /> <br /> System crash is observed with stack trace warning of use after<br /> free. There are 2 signals to tell dpc_thread to terminate (UNLOADING<br /> flag and kthread_stop).<br /> <br /> On setting the UNLOADING flag when dpc_thread happens to run at the time<br /> and sees the flag, this causes dpc_thread to exit and clean up<br /> itself. When kthread_stop is called for final cleanup, this causes use<br /> after free.<br /> <br /> Remove UNLOADING signal to terminate dpc_thread. Use the kthread_stop<br /> as the main signal to exit dpc_thread.<br /> <br /> [596663.812935] kernel BUG at mm/slub.c:294!<br /> [596663.812950] invalid opcode: 0000 [#1] SMP PTI<br /> [596663.812957] CPU: 13 PID: 1475935 Comm: rmmod Kdump: loaded Tainted: G IOE --------- - - 4.18.0-240.el8.x86_64 #1<br /> [596663.812960] Hardware name: HP ProLiant DL380p Gen8, BIOS P70 08/20/2012<br /> [596663.812974] RIP: 0010:__slab_free+0x17d/0x360<br /> <br /> ...<br /> [596663.813008] Call Trace:<br /> [596663.813022] ? __dentry_kill+0x121/0x170<br /> [596663.813030] ? _cond_resched+0x15/0x30<br /> [596663.813034] ? _cond_resched+0x15/0x30<br /> [596663.813039] ? wait_for_completion+0x35/0x190<br /> [596663.813048] ? try_to_wake_up+0x63/0x540<br /> [596663.813055] free_task+0x5a/0x60<br /> [596663.813061] kthread_stop+0xf3/0x100<br /> [596663.813103] qla2x00_remove_one+0x284/0x440 [qla2xxx]