CVE-2022-50365

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> skbuff: Account for tail adjustment during pull operations<br /> <br /> Extending the tail can have some unexpected side effects if a program uses<br /> a helper like BPF_FUNC_skb_pull_data to read partial content beyond the<br /> head skb headlen when all the skbs in the gso frag_list are linear with no<br /> head_frag -<br /> <br /> kernel BUG at net/core/skbuff.c:4219!<br /> pc : skb_segment+0xcf4/0xd2c<br /> lr : skb_segment+0x63c/0xd2c<br /> Call trace:<br /> skb_segment+0xcf4/0xd2c<br /> __udp_gso_segment+0xa4/0x544<br /> udp4_ufo_fragment+0x184/0x1c0<br /> inet_gso_segment+0x16c/0x3a4<br /> skb_mac_gso_segment+0xd4/0x1b0<br /> __skb_gso_segment+0xcc/0x12c<br /> udp_rcv_segment+0x54/0x16c<br /> udp_queue_rcv_skb+0x78/0x144<br /> udp_unicast_rcv_skb+0x8c/0xa4<br /> __udp4_lib_rcv+0x490/0x68c<br /> udp_rcv+0x20/0x30<br /> ip_protocol_deliver_rcu+0x1b0/0x33c<br /> ip_local_deliver+0xd8/0x1f0<br /> ip_rcv+0x98/0x1a4<br /> deliver_ptype_list_skb+0x98/0x1ec<br /> __netif_receive_skb_core+0x978/0xc60<br /> <br /> Fix this by marking these skbs as GSO_DODGY so segmentation can handle<br /> the tail updates accordingly.