Vulnerability-Lookup

GSD-2021-47099

Vulnerability from gsd - Updated: 2024-03-01 06:04

Details

In the Linux kernel, the following vulnerability has been resolved: veth: ensure skb entering GRO are not cloned. After commit d3256efd8e8b ("veth: allow enabling NAPI even without XDP"), 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+ #25 [ 53.982634][ C1] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 [ 53.982634][ C1] RIP: 0010:skb_shift+0x13ef/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 <0f> 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] <TASK> [ 53.982634][ C1] tcp_sacktag_walk+0xaba/0x18e0 [ 53.982634][ C1] tcp_sacktag_write_queue+0xe7b/0x3460 [ 53.982634][ C1] tcp_ack+0x2666/0x54b0 [ 53.982634][ C1] tcp_rcv_established+0x4d9/0x20f0 [ 53.982634][ C1] tcp_v4_do_rcv+0x551/0x810 [ 53.982634][ C1] tcp_v4_rcv+0x22ed/0x2ed0 [ 53.982634][ C1] ip_protocol_deliver_rcu+0x96/0xaf0 [ 53.982634][ C1] ip_local_deliver_finish+0x1e0/0x2f0 [ 53.982634][ C1] ip_sublist_rcv_finish+0x211/0x440 [ 53.982634][ C1] ip_list_rcv_finish.constprop.0+0x424/0x660 [ 53.982634][ C1] ip_list_rcv+0x2c8/0x410 [ 53.982634][ C1] __netif_receive_skb_list_core+0x65c/0x910 [ 53.982634][ C1] netif_receive_skb_list_internal+0x5f9/0xcb0 [ 53.982634][ C1] napi_complete_done+0x188/0x6e0 [ 53.982634][ C1] gro_cell_poll+0x10c/0x1d0 [ 53.982634][ C1] __napi_poll+0xa1/0x530 [ 53.982634][ C1] net_rx_action+0x567/0x1270 [ 53.982634][ C1] __do_softirq+0x28a/0x9ba [ 53.982634][ C1] run_ksoftirqd+0x32/0x60 [ 53.982634][ C1] smpboot_thread_fn+0x559/0x8c0 [ 53.982634][ C1] kthread+0x3b9/0x490 [ 53.982634][ C1] ret_from_fork+0x22/0x30 [ 53.982634][ C1] </TASK> 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 -> v2: - use avoid skb_copy and fallback to netif_receive_skb - Eric

Aliases

CVE-2021-47099

JSON

To clipboard

{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-47099"
      ],
      "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nveth: ensure skb entering GRO are not cloned.\n\nAfter commit d3256efd8e8b (\"veth: allow enabling NAPI even without XDP\"),\nif GRO is enabled on a veth device and TSO is disabled on the peer\ndevice, TCP skbs will go through the NAPI callback. If there is no XDP\nprogram attached, the veth code does not perform any share check, and\nshared/cloned skbs could enter the GRO engine.\n\nIgnat reported a BUG triggered later-on due to the above condition:\n\n[   53.970529][    C1] kernel BUG at net/core/skbuff.c:3574!\n[   53.981755][    C1] invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI\n[   53.982634][    C1] CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc5+ #25\n[   53.982634][    C1] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n[   53.982634][    C1] RIP: 0010:skb_shift+0x13ef/0x23b0\n[   53.982634][    C1] Code: ea 03 0f b6 04 02 48 89 fa 83 e2 07 38 d0\n7f 08 84 c0 0f 85 41 0c 00 00 41 80 7f 02 00 4d 8d b5 d0 00 00 00 0f\n85 74 f5 ff ff \u003c0f\u003e 0b 4d 8d 77 20 be 04 00 00 00 4c 89 44 24 78 4c 89\nf7 4c 89 8c\n[   53.982634][    C1] RSP: 0018:ffff8881008f7008 EFLAGS: 00010246\n[   53.982634][    C1] RAX: 0000000000000000 RBX: ffff8881180b4c80 RCX: 0000000000000000\n[   53.982634][    C1] RDX: 0000000000000002 RSI: ffff8881180b4d3c RDI: ffff88810bc9cac2\n[   53.982634][    C1] RBP: ffff8881008f70b8 R08: ffff8881180b4cf4 R09: ffff8881180b4cf0\n[   53.982634][    C1] R10: ffffed1022999e5c R11: 0000000000000002 R12: 0000000000000590\n[   53.982634][    C1] R13: ffff88810f940c80 R14: ffff88810f940d50 R15: ffff88810bc9cac0\n[   53.982634][    C1] FS:  0000000000000000(0000) GS:ffff888235880000(0000) knlGS:0000000000000000\n[   53.982634][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[   53.982634][    C1] CR2: 00007ff5f9b86680 CR3: 0000000108ce8004 CR4: 0000000000170ee0\n[   53.982634][    C1] Call Trace:\n[   53.982634][    C1]  \u003cTASK\u003e\n[   53.982634][    C1]  tcp_sacktag_walk+0xaba/0x18e0\n[   53.982634][    C1]  tcp_sacktag_write_queue+0xe7b/0x3460\n[   53.982634][    C1]  tcp_ack+0x2666/0x54b0\n[   53.982634][    C1]  tcp_rcv_established+0x4d9/0x20f0\n[   53.982634][    C1]  tcp_v4_do_rcv+0x551/0x810\n[   53.982634][    C1]  tcp_v4_rcv+0x22ed/0x2ed0\n[   53.982634][    C1]  ip_protocol_deliver_rcu+0x96/0xaf0\n[   53.982634][    C1]  ip_local_deliver_finish+0x1e0/0x2f0\n[   53.982634][    C1]  ip_sublist_rcv_finish+0x211/0x440\n[   53.982634][    C1]  ip_list_rcv_finish.constprop.0+0x424/0x660\n[   53.982634][    C1]  ip_list_rcv+0x2c8/0x410\n[   53.982634][    C1]  __netif_receive_skb_list_core+0x65c/0x910\n[   53.982634][    C1]  netif_receive_skb_list_internal+0x5f9/0xcb0\n[   53.982634][    C1]  napi_complete_done+0x188/0x6e0\n[   53.982634][    C1]  gro_cell_poll+0x10c/0x1d0\n[   53.982634][    C1]  __napi_poll+0xa1/0x530\n[   53.982634][    C1]  net_rx_action+0x567/0x1270\n[   53.982634][    C1]  __do_softirq+0x28a/0x9ba\n[   53.982634][    C1]  run_ksoftirqd+0x32/0x60\n[   53.982634][    C1]  smpboot_thread_fn+0x559/0x8c0\n[   53.982634][    C1]  kthread+0x3b9/0x490\n[   53.982634][    C1]  ret_from_fork+0x22/0x30\n[   53.982634][    C1]  \u003c/TASK\u003e\n\nAddress the issue by skipping the GRO stage for shared or cloned skbs.\nTo reduce the chance of OoO, try to unclone the skbs before giving up.\n\nv1 -\u003e v2:\n - use avoid skb_copy and fallback to netif_receive_skb  - Eric",
      "id": "GSD-2021-47099",
      "modified": "2024-03-01T06:04:48.336510Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@kernel.org",
        "ID": "CVE-2021-47099",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Linux",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "d3256efd8e8b",
                          "version_value": "d2269ae48598"
                        },
                        {
                          "version_value": "not down converted",
                          "x_cve_json_5_version_data": {
                            "defaultStatus": "affected",
                            "versions": [
                              {
                                "status": "affected",
                                "version": "5.13"
                              },
                              {
                                "lessThan": "5.13",
                                "status": "unaffected",
                                "version": "0",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "5.15.*",
                                "status": "unaffected",
                                "version": "5.15.12",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "*",
                                "status": "unaffected",
                                "version": "5.16",
                                "versionType": "original_commit_for_fix"
                              }
                            ]
                          }
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Linux"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nveth: ensure skb entering GRO are not cloned.\n\nAfter commit d3256efd8e8b (\"veth: allow enabling NAPI even without XDP\"),\nif GRO is enabled on a veth device and TSO is disabled on the peer\ndevice, TCP skbs will go through the NAPI callback. If there is no XDP\nprogram attached, the veth code does not perform any share check, and\nshared/cloned skbs could enter the GRO engine.\n\nIgnat reported a BUG triggered later-on due to the above condition:\n\n[   53.970529][    C1] kernel BUG at net/core/skbuff.c:3574!\n[   53.981755][    C1] invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI\n[   53.982634][    C1] CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc5+ #25\n[   53.982634][    C1] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n[   53.982634][    C1] RIP: 0010:skb_shift+0x13ef/0x23b0\n[   53.982634][    C1] Code: ea 03 0f b6 04 02 48 89 fa 83 e2 07 38 d0\n7f 08 84 c0 0f 85 41 0c 00 00 41 80 7f 02 00 4d 8d b5 d0 00 00 00 0f\n85 74 f5 ff ff \u003c0f\u003e 0b 4d 8d 77 20 be 04 00 00 00 4c 89 44 24 78 4c 89\nf7 4c 89 8c\n[   53.982634][    C1] RSP: 0018:ffff8881008f7008 EFLAGS: 00010246\n[   53.982634][    C1] RAX: 0000000000000000 RBX: ffff8881180b4c80 RCX: 0000000000000000\n[   53.982634][    C1] RDX: 0000000000000002 RSI: ffff8881180b4d3c RDI: ffff88810bc9cac2\n[   53.982634][    C1] RBP: ffff8881008f70b8 R08: ffff8881180b4cf4 R09: ffff8881180b4cf0\n[   53.982634][    C1] R10: ffffed1022999e5c R11: 0000000000000002 R12: 0000000000000590\n[   53.982634][    C1] R13: ffff88810f940c80 R14: ffff88810f940d50 R15: ffff88810bc9cac0\n[   53.982634][    C1] FS:  0000000000000000(0000) GS:ffff888235880000(0000) knlGS:0000000000000000\n[   53.982634][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[   53.982634][    C1] CR2: 00007ff5f9b86680 CR3: 0000000108ce8004 CR4: 0000000000170ee0\n[   53.982634][    C1] Call Trace:\n[   53.982634][    C1]  \u003cTASK\u003e\n[   53.982634][    C1]  tcp_sacktag_walk+0xaba/0x18e0\n[   53.982634][    C1]  tcp_sacktag_write_queue+0xe7b/0x3460\n[   53.982634][    C1]  tcp_ack+0x2666/0x54b0\n[   53.982634][    C1]  tcp_rcv_established+0x4d9/0x20f0\n[   53.982634][    C1]  tcp_v4_do_rcv+0x551/0x810\n[   53.982634][    C1]  tcp_v4_rcv+0x22ed/0x2ed0\n[   53.982634][    C1]  ip_protocol_deliver_rcu+0x96/0xaf0\n[   53.982634][    C1]  ip_local_deliver_finish+0x1e0/0x2f0\n[   53.982634][    C1]  ip_sublist_rcv_finish+0x211/0x440\n[   53.982634][    C1]  ip_list_rcv_finish.constprop.0+0x424/0x660\n[   53.982634][    C1]  ip_list_rcv+0x2c8/0x410\n[   53.982634][    C1]  __netif_receive_skb_list_core+0x65c/0x910\n[   53.982634][    C1]  netif_receive_skb_list_internal+0x5f9/0xcb0\n[   53.982634][    C1]  napi_complete_done+0x188/0x6e0\n[   53.982634][    C1]  gro_cell_poll+0x10c/0x1d0\n[   53.982634][    C1]  __napi_poll+0xa1/0x530\n[   53.982634][    C1]  net_rx_action+0x567/0x1270\n[   53.982634][    C1]  __do_softirq+0x28a/0x9ba\n[   53.982634][    C1]  run_ksoftirqd+0x32/0x60\n[   53.982634][    C1]  smpboot_thread_fn+0x559/0x8c0\n[   53.982634][    C1]  kthread+0x3b9/0x490\n[   53.982634][    C1]  ret_from_fork+0x22/0x30\n[   53.982634][    C1]  \u003c/TASK\u003e\n\nAddress the issue by skipping the GRO stage for shared or cloned skbs.\nTo reduce the chance of OoO, try to unclone the skbs before giving up.\n\nv1 -\u003e v2:\n - use avoid skb_copy and fallback to netif_receive_skb  - Eric"
          }
        ]
      },
      "generator": {
        "engine": "bippy-4986f5686161"
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "n/a"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://git.kernel.org/stable/c/d2269ae48598e05b59ec9ea9e6e44fd33941130d",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/d2269ae48598e05b59ec9ea9e6e44fd33941130d"
          },
          {
            "name": "https://git.kernel.org/stable/c/9695b7de5b4760ed22132aca919570c0190cb0ce",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/9695b7de5b4760ed22132aca919570c0190cb0ce"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nveth: ensure skb entering GRO are not cloned.\n\nAfter commit d3256efd8e8b (\"veth: allow enabling NAPI even without XDP\"),\nif GRO is enabled on a veth device and TSO is disabled on the peer\ndevice, TCP skbs will go through the NAPI callback. If there is no XDP\nprogram attached, the veth code does not perform any share check, and\nshared/cloned skbs could enter the GRO engine.\n\nIgnat reported a BUG triggered later-on due to the above condition:\n\n[   53.970529][    C1] kernel BUG at net/core/skbuff.c:3574!\n[   53.981755][    C1] invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI\n[   53.982634][    C1] CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc5+ #25\n[   53.982634][    C1] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n[   53.982634][    C1] RIP: 0010:skb_shift+0x13ef/0x23b0\n[   53.982634][    C1] Code: ea 03 0f b6 04 02 48 89 fa 83 e2 07 38 d0\n7f 08 84 c0 0f 85 41 0c 00 00 41 80 7f 02 00 4d 8d b5 d0 00 00 00 0f\n85 74 f5 ff ff \u003c0f\u003e 0b 4d 8d 77 20 be 04 00 00 00 4c 89 44 24 78 4c 89\nf7 4c 89 8c\n[   53.982634][    C1] RSP: 0018:ffff8881008f7008 EFLAGS: 00010246\n[   53.982634][    C1] RAX: 0000000000000000 RBX: ffff8881180b4c80 RCX: 0000000000000000\n[   53.982634][    C1] RDX: 0000000000000002 RSI: ffff8881180b4d3c RDI: ffff88810bc9cac2\n[   53.982634][    C1] RBP: ffff8881008f70b8 R08: ffff8881180b4cf4 R09: ffff8881180b4cf0\n[   53.982634][    C1] R10: ffffed1022999e5c R11: 0000000000000002 R12: 0000000000000590\n[   53.982634][    C1] R13: ffff88810f940c80 R14: ffff88810f940d50 R15: ffff88810bc9cac0\n[   53.982634][    C1] FS:  0000000000000000(0000) GS:ffff888235880000(0000) knlGS:0000000000000000\n[   53.982634][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[   53.982634][    C1] CR2: 00007ff5f9b86680 CR3: 0000000108ce8004 CR4: 0000000000170ee0\n[   53.982634][    C1] Call Trace:\n[   53.982634][    C1]  \u003cTASK\u003e\n[   53.982634][    C1]  tcp_sacktag_walk+0xaba/0x18e0\n[   53.982634][    C1]  tcp_sacktag_write_queue+0xe7b/0x3460\n[   53.982634][    C1]  tcp_ack+0x2666/0x54b0\n[   53.982634][    C1]  tcp_rcv_established+0x4d9/0x20f0\n[   53.982634][    C1]  tcp_v4_do_rcv+0x551/0x810\n[   53.982634][    C1]  tcp_v4_rcv+0x22ed/0x2ed0\n[   53.982634][    C1]  ip_protocol_deliver_rcu+0x96/0xaf0\n[   53.982634][    C1]  ip_local_deliver_finish+0x1e0/0x2f0\n[   53.982634][    C1]  ip_sublist_rcv_finish+0x211/0x440\n[   53.982634][    C1]  ip_list_rcv_finish.constprop.0+0x424/0x660\n[   53.982634][    C1]  ip_list_rcv+0x2c8/0x410\n[   53.982634][    C1]  __netif_receive_skb_list_core+0x65c/0x910\n[   53.982634][    C1]  netif_receive_skb_list_internal+0x5f9/0xcb0\n[   53.982634][    C1]  napi_complete_done+0x188/0x6e0\n[   53.982634][    C1]  gro_cell_poll+0x10c/0x1d0\n[   53.982634][    C1]  __napi_poll+0xa1/0x530\n[   53.982634][    C1]  net_rx_action+0x567/0x1270\n[   53.982634][    C1]  __do_softirq+0x28a/0x9ba\n[   53.982634][    C1]  run_ksoftirqd+0x32/0x60\n[   53.982634][    C1]  smpboot_thread_fn+0x559/0x8c0\n[   53.982634][    C1]  kthread+0x3b9/0x490\n[   53.982634][    C1]  ret_from_fork+0x22/0x30\n[   53.982634][    C1]  \u003c/TASK\u003e\n\nAddress the issue by skipping the GRO stage for shared or cloned skbs.\nTo reduce the chance of OoO, try to unclone the skbs before giving up.\n\nv1 -\u003e v2:\n - use avoid skb_copy and fallback to netif_receive_skb  - Eric"
          }
        ],
        "id": "CVE-2021-47099",
        "lastModified": "2024-03-05T13:41:01.900",
        "metrics": {},
        "published": "2024-03-04T18:15:08.153",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9695b7de5b4760ed22132aca919570c0190cb0ce"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d2269ae48598e05b59ec9ea9e6e44fd33941130d"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    }
  }
}

CVE-2021-47099 (GCVE-0-2021-47099)

Vulnerability from cvelistv5 – Published: 2024-03-04 18:10 – Updated: 2026-08-05 08:45

Title

veth: ensure skb entering GRO are not cloned.

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

6 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-03-12 14:24 UTC

CWE

CWE-noinfo Not enough information

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6641 records in the last 180 days details

References

2 references

URL	Tags
https://git.kernel.org/stable/c/d2269ae48598e05b5…
https://git.kernel.org/stable/c/9695b7de5b4760ed2…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d3256efd8e8b234a6251e4d4580bd2c3c31fdc4c , < d2269ae48598e05b59ec9ea9e6e44fd33941130d (git) Affected: d3256efd8e8b234a6251e4d4580bd2c3c31fdc4c , < 9695b7de5b4760ed22132aca919570c0190cb0ce (git)
Linux	Linux	Affected: 5.13 Unaffected: 0 , < 5.13 (semver) Unaffected: 5.15.12 , ≤ 5.15.* (semver) Unaffected: 5.16 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 6,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "HIGH",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2021-47099",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-03-12T14:24:44.909749Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "description": "CWE-noinfo Not enough information",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-10-31T14:56:58.471Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:24:39.924Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/d2269ae48598e05b59ec9ea9e6e44fd33941130d"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/9695b7de5b4760ed22132aca919570c0190cb0ce"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/veth.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d2269ae48598e05b59ec9ea9e6e44fd33941130d",
              "status": "affected",
              "version": "d3256efd8e8b234a6251e4d4580bd2c3c31fdc4c",
              "versionType": "git"
            },
            {
              "lessThan": "9695b7de5b4760ed22132aca919570c0190cb0ce",
              "status": "affected",
              "version": "d3256efd8e8b234a6251e4d4580bd2c3c31fdc4c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/veth.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "lessThan": "5.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.12",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.16",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nveth: ensure skb entering GRO are not cloned.\n\nAfter commit d3256efd8e8b (\"veth: allow enabling NAPI even without XDP\"),\nif GRO is enabled on a veth device and TSO is disabled on the peer\ndevice, TCP skbs will go through the NAPI callback. If there is no XDP\nprogram attached, the veth code does not perform any share check, and\nshared/cloned skbs could enter the GRO engine.\n\nIgnat reported a BUG triggered later-on due to the above condition:\n\n[   53.970529][    C1] kernel BUG at net/core/skbuff.c:3574!\n[   53.981755][    C1] invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI\n[   53.982634][    C1] CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc5+ #25\n[   53.982634][    C1] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n[   53.982634][    C1] RIP: 0010:skb_shift+0x13ef/0x23b0\n[   53.982634][    C1] Code: ea 03 0f b6 04 02 48 89 fa 83 e2 07 38 d0\n7f 08 84 c0 0f 85 41 0c 00 00 41 80 7f 02 00 4d 8d b5 d0 00 00 00 0f\n85 74 f5 ff ff \u003c0f\u003e 0b 4d 8d 77 20 be 04 00 00 00 4c 89 44 24 78 4c 89\nf7 4c 89 8c\n[   53.982634][    C1] RSP: 0018:ffff8881008f7008 EFLAGS: 00010246\n[   53.982634][    C1] RAX: 0000000000000000 RBX: ffff8881180b4c80 RCX: 0000000000000000\n[   53.982634][    C1] RDX: 0000000000000002 RSI: ffff8881180b4d3c RDI: ffff88810bc9cac2\n[   53.982634][    C1] RBP: ffff8881008f70b8 R08: ffff8881180b4cf4 R09: ffff8881180b4cf0\n[   53.982634][    C1] R10: ffffed1022999e5c R11: 0000000000000002 R12: 0000000000000590\n[   53.982634][    C1] R13: ffff88810f940c80 R14: ffff88810f940d50 R15: ffff88810bc9cac0\n[   53.982634][    C1] FS:  0000000000000000(0000) GS:ffff888235880000(0000) knlGS:0000000000000000\n[   53.982634][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[   53.982634][    C1] CR2: 00007ff5f9b86680 CR3: 0000000108ce8004 CR4: 0000000000170ee0\n[   53.982634][    C1] Call Trace:\n[   53.982634][    C1]  \u003cTASK\u003e\n[   53.982634][    C1]  tcp_sacktag_walk+0xaba/0x18e0\n[   53.982634][    C1]  tcp_sacktag_write_queue+0xe7b/0x3460\n[   53.982634][    C1]  tcp_ack+0x2666/0x54b0\n[   53.982634][    C1]  tcp_rcv_established+0x4d9/0x20f0\n[   53.982634][    C1]  tcp_v4_do_rcv+0x551/0x810\n[   53.982634][    C1]  tcp_v4_rcv+0x22ed/0x2ed0\n[   53.982634][    C1]  ip_protocol_deliver_rcu+0x96/0xaf0\n[   53.982634][    C1]  ip_local_deliver_finish+0x1e0/0x2f0\n[   53.982634][    C1]  ip_sublist_rcv_finish+0x211/0x440\n[   53.982634][    C1]  ip_list_rcv_finish.constprop.0+0x424/0x660\n[   53.982634][    C1]  ip_list_rcv+0x2c8/0x410\n[   53.982634][    C1]  __netif_receive_skb_list_core+0x65c/0x910\n[   53.982634][    C1]  netif_receive_skb_list_internal+0x5f9/0xcb0\n[   53.982634][    C1]  napi_complete_done+0x188/0x6e0\n[   53.982634][    C1]  gro_cell_poll+0x10c/0x1d0\n[   53.982634][    C1]  __napi_poll+0xa1/0x530\n[   53.982634][    C1]  net_rx_action+0x567/0x1270\n[   53.982634][    C1]  __do_softirq+0x28a/0x9ba\n[   53.982634][    C1]  run_ksoftirqd+0x32/0x60\n[   53.982634][    C1]  smpboot_thread_fn+0x559/0x8c0\n[   53.982634][    C1]  kthread+0x3b9/0x490\n[   53.982634][    C1]  ret_from_fork+0x22/0x30\n[   53.982634][    C1]  \u003c/TASK\u003e\n\nAddress the issue by skipping the GRO stage for shared or cloned skbs.\nTo reduce the chance of OoO, try to unclone the skbs before giving up.\n\nv1 -\u003e v2:\n - use avoid skb_copy and fallback to netif_receive_skb  - Eric"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is in the veth virtual-device TX/RX path and is triggered by locally originated TCP skbs crossing a veth pair (typically clones from tcp_transmit_skb), not by unauthenticated remote packets on a network-facing protocol.\nAC:L - An attacker who can create/configure a veth pair fully controls GRO-on/TSO-off and both ends of the TCP connection, so cloned skbs reliably enter GRO and the failure can be provoked without relying on external timing or layout.\nPR:L - Creating veth devices and toggling GRO/TSO requires only CAP_NET_ADMIN in the owning user_ns, which an unprivileged process obtains via user namespaces (unshare -Urn), so privileges are Low rather than real host root.\nUI:N - No victim action is required; the attacker configures the interfaces and generates the TCP traffic that hits the vulnerable path.\nS:U - Impact stays within the host kernel\u2019s authority (crash/memory corruption of sk_buff state); this is not a VM, IOMMU, or other cross-boundary escape.\nC:H - GRO coalescing mutates shared skb_shinfo/frags of cloned skbs, corrupting the peer clone still on the TCP retransmit queue and enabling use-after-free or disclosure of page-backed packet data.\nI:H - The same shared-frag corruption can break page ownership (stolen/zeroed nr_frags, merge-path frag edits), yielding double-free or attacker-influenced writes consistent with heap memory-corruption primitives.\nA:H - The reported outcome is an unconditional kernel BUG_ON in skb_shift during TCP SACK processing, which oopses/panics the host."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:45:58.170Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d2269ae48598e05b59ec9ea9e6e44fd33941130d"
        },
        {
          "url": "https://git.kernel.org/stable/c/9695b7de5b4760ed22132aca919570c0190cb0ce"
        }
      ],
      "title": "veth: ensure skb entering GRO are not cloned.",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47099",
    "datePublished": "2024-03-04T18:10:51.200Z",
    "dateReserved": "2024-02-29T22:33:44.301Z",
    "dateUpdated": "2026-08-05T08:45:58.170Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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