{
  "cveId": "CVE-2021-47099",
  "url": "https://patchblox.com/security/cve/CVE-2021-47099",
  "summary": "CVE-2021-47099 is fixed in 39 products on 1 platform, first by RHSA-2022:7683, released November 8, 2022. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  veth: ensure skb entering GRO are not cloned",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  veth: ensure skb entering GRO are not cloned.  After commit d3256efd8e8b (\u0022veth: allow enabling NAPI even without XDP\u0022), if GRO is enabled on a veth device and TSO is disabled on the peer device, TCP skbs will go through the NAPI callback. If there is no XDP program attached, the veth code does not perform any share check, and shared/cloned skbs could enter the GRO engine.  Ignat reported a BUG triggered later-on due to the above condition:  [   53.970529][    C1] kernel BUG at net/core/skbuff.c:3574! [   53.981755][    C1] invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI [   53.982634][    C1] CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc5\u002B #25 [   53.982634][    C1] Hardware name: QEMU Standard PC (Q35 \u002B ICH9, 2009), BIOS 0.0.0 02/06/2015 [   53.982634][    C1] RIP: 0010:skb_shift\u002B0x13ef/0x23b0 [   53.982634][    C1] Code: ea 03 0f b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 41 0c 00 00 41 80 7f 02 00 4d 8d b5 d0 00 00 00 0f 85 74 f5 ff ff \u003C0f\u003E 0b 4d 8d 77 20 be 04 00 00 00 4c 89 44 24 78 4c 89 f7 4c 89 8c [   53.982634][    C1] RSP: 0018:ffff8881008f7008 EFLAGS: 00010246 [   53.982634][    C1] RAX: 0000000000000000 RBX: ffff8881180b4c80 RCX: 0000000000000000 [   53.982634][    C1] RDX: 0000000000000002 RSI: ffff8881180b4d3c RDI: ffff88810bc9cac2 [   53.982634][    C1] RBP: ffff8881008f70b8 R08: ffff8881180b4cf4 R09: ffff8881180b4cf0 [   53.982634][    C1] R10: ffffed1022999e5c R11: 0000000000000002 R12: 0000000000000590 [   53.982634][    C1] R13: ffff88810f940c80 R14: ffff88810f940d50 R15: ffff88810bc9cac0 [   53.982634][    C1] FS:  0000000000000000(0000) GS:ffff888235880000(0000) knlGS:0000000000000000 [   53.982634][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [   53.982634][    C1] CR2: 00007ff5f9b86680 CR3: 0000000108ce8004 CR4: 0000000000170ee0 [   53.982634][    C1] Call Trace: [   53.982634][    C1]  \u003CTASK\u003E [   53.982634][    C1]  tcp_sacktag_walk\u002B0xaba/0x18e0 [   53.982634][    C1]  tcp_sacktag_write_queue\u002B0xe7b/0x3460 [   53.982634][    C1]  tcp_ack\u002B0x2666/0x54b0 [   53.982634][    C1]  tcp_rcv_established\u002B0x4d9/0x20f0 [   53.982634][    C1]  tcp_v4_do_rcv\u002B0x551/0x810 [   53.982634][    C1]  tcp_v4_rcv\u002B0x22ed/0x2ed0 [   53.982634][    C1]  ip_protocol_deliver_rcu\u002B0x96/0xaf0 [   53.982634][    C1]  ip_local_deliver_finish\u002B0x1e0/0x2f0 [   53.982634][    C1]  ip_sublist_rcv_finish\u002B0x211/0x440 [   53.982634][    C1]  ip_list_rcv_finish.constprop.0\u002B0x424/0x660 [   53.982634][    C1]  ip_list_rcv\u002B0x2c8/0x410 [   53.982634][    C1]  __netif_receive_skb_list_core\u002B0x65c/0x910 [   53.982634][    C1]  netif_receive_skb_list_internal\u002B0x5f9/0xcb0 [   53.982634][    C1]  napi_complete_done\u002B0x188/0x6e0 [   53.982634][    C1]  gro_cell_poll\u002B0x10c/0x1d0 [   53.982634][    C1]  __napi_poll\u002B0xa1/0x530 [   53.982634][    C1]  net_rx_action\u002B0x567/0x1270 [   53.982634][    C1]  __do_softirq\u002B0x28a/0x9ba [   53.982634][    C1]  run_ksoftirqd\u002B0x32/0x60 [   53.982634][    C1]  smpboot_thread_fn\u002B0x559/0x8c0 [   53.982634][    C1]  kthread\u002B0x3b9/0x490 [   53.982634][    C1]  ret_from_fork\u002B0x22/0x30 [   53.982634][    C1]  \u003C/TASK\u003E  Address the issue by skipping the GRO stage for shared or cloned skbs. To reduce the chance of OoO, try to unclone the skbs before giving up.  v1 -\u003E v2:  - use avoid skb_copy and fallback to netif_receive_skb  - Eric",
  "published": "2022-11-08T00:00:00Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00228,
  "epssPercentile": 0.13609,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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