CVE-2023-52922

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> can: bcm: Fix UAF in bcm_proc_show()<br /> <br /> BUG: KASAN: slab-use-after-free in bcm_proc_show+0x969/0xa80<br /> Read of size 8 at addr ffff888155846230 by task cat/7862<br /> <br /> CPU: 1 PID: 7862 Comm: cat Not tainted 6.5.0-rc1-00153-gc8746099c197 #230<br /> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014<br /> Call Trace:<br /> <br /> dump_stack_lvl+0xd5/0x150<br /> print_report+0xc1/0x5e0<br /> kasan_report+0xba/0xf0<br /> bcm_proc_show+0x969/0xa80<br /> seq_read_iter+0x4f6/0x1260<br /> seq_read+0x165/0x210<br /> proc_reg_read+0x227/0x300<br /> vfs_read+0x1d5/0x8d0<br /> ksys_read+0x11e/0x240<br /> do_syscall_64+0x35/0xb0<br /> entry_SYSCALL_64_after_hwframe+0x63/0xcd<br /> <br /> Allocated by task 7846:<br /> kasan_save_stack+0x1e/0x40<br /> kasan_set_track+0x21/0x30<br /> __kasan_kmalloc+0x9e/0xa0<br /> bcm_sendmsg+0x264b/0x44e0<br /> sock_sendmsg+0xda/0x180<br /> ____sys_sendmsg+0x735/0x920<br /> ___sys_sendmsg+0x11d/0x1b0<br /> __sys_sendmsg+0xfa/0x1d0<br /> do_syscall_64+0x35/0xb0<br /> entry_SYSCALL_64_after_hwframe+0x63/0xcd<br /> <br /> Freed by task 7846:<br /> kasan_save_stack+0x1e/0x40<br /> kasan_set_track+0x21/0x30<br /> kasan_save_free_info+0x27/0x40<br /> ____kasan_slab_free+0x161/0x1c0<br /> slab_free_freelist_hook+0x119/0x220<br /> __kmem_cache_free+0xb4/0x2e0<br /> rcu_core+0x809/0x1bd0<br /> <br /> bcm_op is freed before procfs entry be removed in bcm_release(),<br /> this lead to bcm_proc_show() may read the freed bcm_op.