CVE-2024-50261

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> macsec: Fix use-after-free while sending the offloading packet<br /> <br /> KASAN reports the following UAF. The metadata_dst, which is used to<br /> store the SCI value for macsec offload, is already freed by<br /> metadata_dst_free() in macsec_free_netdev(), while driver still use it<br /> for sending the packet.<br /> <br /> To fix this issue, dst_release() is used instead to release<br /> metadata_dst. So it is not freed instantly in macsec_free_netdev() if<br /> still referenced by skb.<br /> <br /> BUG: KASAN: slab-use-after-free in mlx5e_xmit+0x1e8f/0x4190 [mlx5_core]<br /> Read of size 2 at addr ffff88813e42e038 by task kworker/7:2/714<br /> [...]<br /> Workqueue: mld mld_ifc_work<br /> Call Trace:<br /> <br /> dump_stack_lvl+0x51/0x60<br /> print_report+0xc1/0x600<br /> kasan_report+0xab/0xe0<br /> mlx5e_xmit+0x1e8f/0x4190 [mlx5_core]<br /> dev_hard_start_xmit+0x120/0x530<br /> sch_direct_xmit+0x149/0x11e0<br /> __qdisc_run+0x3ad/0x1730<br /> __dev_queue_xmit+0x1196/0x2ed0<br /> vlan_dev_hard_start_xmit+0x32e/0x510 [8021q]<br /> dev_hard_start_xmit+0x120/0x530<br /> __dev_queue_xmit+0x14a7/0x2ed0<br /> macsec_start_xmit+0x13e9/0x2340<br /> dev_hard_start_xmit+0x120/0x530<br /> __dev_queue_xmit+0x14a7/0x2ed0<br /> ip6_finish_output2+0x923/0x1a70<br /> ip6_finish_output+0x2d7/0x970<br /> ip6_output+0x1ce/0x3a0<br /> NF_HOOK.constprop.0+0x15f/0x190<br /> mld_sendpack+0x59a/0xbd0<br /> mld_ifc_work+0x48a/0xa80<br /> process_one_work+0x5aa/0xe50<br /> worker_thread+0x79c/0x1290<br /> kthread+0x28f/0x350<br /> ret_from_fork+0x2d/0x70<br /> ret_from_fork_asm+0x11/0x20<br /> <br /> <br /> Allocated by task 3922:<br /> kasan_save_stack+0x20/0x40<br /> kasan_save_track+0x10/0x30<br /> __kasan_kmalloc+0x77/0x90<br /> __kmalloc_noprof+0x188/0x400<br /> metadata_dst_alloc+0x1f/0x4e0<br /> macsec_newlink+0x914/0x1410<br /> __rtnl_newlink+0xe08/0x15b0<br /> rtnl_newlink+0x5f/0x90<br /> rtnetlink_rcv_msg+0x667/0xa80<br /> netlink_rcv_skb+0x12c/0x360<br /> netlink_unicast+0x551/0x770<br /> netlink_sendmsg+0x72d/0xbd0<br /> __sock_sendmsg+0xc5/0x190<br /> ____sys_sendmsg+0x52e/0x6a0<br /> ___sys_sendmsg+0xeb/0x170<br /> __sys_sendmsg+0xb5/0x140<br /> do_syscall_64+0x4c/0x100<br /> entry_SYSCALL_64_after_hwframe+0x4b/0x53<br /> <br /> Freed by task 4011:<br /> kasan_save_stack+0x20/0x40<br /> kasan_save_track+0x10/0x30<br /> kasan_save_free_info+0x37/0x50<br /> poison_slab_object+0x10c/0x190<br /> __kasan_slab_free+0x11/0x30<br /> kfree+0xe0/0x290<br /> macsec_free_netdev+0x3f/0x140<br /> netdev_run_todo+0x450/0xc70<br /> rtnetlink_rcv_msg+0x66f/0xa80<br /> netlink_rcv_skb+0x12c/0x360<br /> netlink_unicast+0x551/0x770<br /> netlink_sendmsg+0x72d/0xbd0<br /> __sock_sendmsg+0xc5/0x190<br /> ____sys_sendmsg+0x52e/0x6a0<br /> ___sys_sendmsg+0xeb/0x170<br /> __sys_sendmsg+0xb5/0x140<br /> do_syscall_64+0x4c/0x100<br /> entry_SYSCALL_64_after_hwframe+0x4b/0x53