{"schemaVersion":3,"id":"CVE-2021-47222","aliases":["UBUNTU-CVE-2021-47222","DEBIAN-CVE-2021-47222"],"status":"published","duplicateOf":null,"title":null,"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: fix vlan tunnel dst refcnt when egressing\n\nThe egress tunnel code uses dst_clone() and directly sets the result\nwhich is wrong because the entry might have 0 refcnt or be already deleted,\ncausing number of problems. It also triggers the WARN_ON() in dst_hold()[1]\nwhen a refcnt couldn't be taken. Fix it by using dst_hold_safe() and\nchecking if a reference was actually taken before setting the dst.\n\n[1] dmesg WARN_ON log and following refcnt errors\n WARNING: CPU: 5 PID: 38 at include/net/dst.h:230 br_handle_egress_vlan_tunnel+0x10b/0x134 [bridge]\n Modules linked in: 8021q garp mrp bridge stp llc bonding ipv6 virtio_net\n CPU: 5 PID: 38 Comm: ksoftirqd/5 Kdump: loaded Tainted: G        W         5.13.0-rc3+ #360\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014\n RIP: 0010:br_handle_egress_vlan_tunnel+0x10b/0x134 [bridge]\n Code: e8 85 bc 01 e1 45 84 f6 74 90 45 31 f6 85 db 48 c7 c7 a0 02 19 a0 41 0f 94 c6 31 c9 31 d2 44 89 f6 e8 64 bc 01 e1 85 db 75 02 <0f> 0b 31 c9 31 d2 44 89 f6 48 c7 c7 70 02 19 a0 e8 4b bc 01 e1 49\n RSP: 0018:ffff8881003d39e8 EFLAGS: 00010246\n RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000\n RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffffa01902a0\n RBP: ffff8881040c6700 R08: 0000000000000000 R09: 0000000000000001\n R10: 2ce93d0054fe0d00 R11: 54fe0d00000e0000 R12: ffff888109515000\n R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000401\n FS:  0000000000000000(0000) GS:ffff88822bf40000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f42ba70f030 CR3: 0000000109926000 CR4: 00000000000006e0\n Call Trace:\n  br_handle_vlan+0xbc/0xca [bridge]\n  __br_forward+0x23/0x164 [bridge]\n  deliver_clone+0x41/0x48 [bridge]\n  br_handle_frame_finish+0x36f/0x3aa [bridge]\n  ? skb_dst+0x2e/0x38 [bridge]\n  ? br_handle_ingress_vlan_tunnel+0x3e/0x1c8 [bridge]\n  ? br_handle_frame_finish+0x3aa/0x3aa [bridge]\n  br_handle_frame+0x2c3/0x377 [bridge]\n  ? __skb_pull+0x33/0x51\n  ? vlan_do_receive+0x4f/0x36a\n  ? br_handle_frame_finish+0x3aa/0x3aa [bridge]\n  __netif_receive_skb_core+0x539/0x7c6\n  ? __list_del_entry_valid+0x16e/0x1c2\n  __netif_receive_skb_list_core+0x6d/0xd6\n  netif_receive_skb_list_internal+0x1d9/0x1fa\n  gro_normal_list+0x22/0x3e\n  dev_gro_receive+0x55b/0x600\n  ? detach_buf_split+0x58/0x140\n  napi_gro_receive+0x94/0x12e\n  virtnet_poll+0x15d/0x315 [virtio_net]\n  __napi_poll+0x2c/0x1c9\n  net_rx_action+0xe6/0x1fb\n  __do_softirq+0x115/0x2d8\n  run_ksoftirqd+0x18/0x20\n  smpboot_thread_fn+0x183/0x19c\n  ? smpboot_unregister_percpu_thread+0x66/0x66\n  kthread+0x10a/0x10f\n  ? kthread_mod_delayed_work+0xb6/0xb6\n  ret_from_fork+0x22/0x30\n ---[ end trace 49f61b07f775fd2b ]---\n dst_release: dst:00000000c02d677a refcnt:-1\n dst_release 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Any operations using the original pointer are no longer valid because the memory \"belongs\" to the code that operates on the new pointer.","type":"weakness","status":"Stable","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/416.html"}],"affected":[{"vendor":"debian","product":"linux","name":"linux","label":"linux","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/linux","purlType":"deb","versions":[{"text":"< 5.10.46-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.10.46-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"linux","name":"linux","label":"linux","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/linux","purlType":"deb","versions":[{"text":"< 4.15.0-156.163","noFixRecorded":false,"fixedIn":null},{"text":"< 5.4.0-81.91","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.15.0-156.163 | < 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