nvd-json-data-feeds/CVE-2021/CVE-2021-471xx/CVE-2021-47136.json

{
  "id": "CVE-2021-47136",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-03-25T09:15:07.970",
  "lastModified": "2025-03-13T21:09:56.750",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: zero-initialize tc skb extension on allocation\n\nFunction skb_ext_add() doesn't initialize created skb extension with any\nvalue and leaves it up to the user. However, since extension of type\nTC_SKB_EXT originally contained only single value tc_skb_ext->chain its\nusers used to just assign the chain value without setting whole extension\nmemory to zero first. This assumption changed when TC_SKB_EXT extension was\nextended with additional fields but not all users were updated to\ninitialize the new fields which leads to use of uninitialized memory\nafterwards. UBSAN log:\n\n[  778.299821] UBSAN: invalid-load in net/openvswitch/flow.c:899:28\n[  778.301495] load of value 107 is not a valid value for type '_Bool'\n[  778.303215] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.12.0-rc7+ #2\n[  778.304933] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n[  778.307901] Call Trace:\n[  778.308680]  <IRQ>\n[  778.309358]  dump_stack+0xbb/0x107\n[  778.310307]  ubsan_epilogue+0x5/0x40\n[  778.311167]  __ubsan_handle_load_invalid_value.cold+0x43/0x48\n[  778.312454]  ? memset+0x20/0x40\n[  778.313230]  ovs_flow_key_extract.cold+0xf/0x14 [openvswitch]\n[  778.314532]  ovs_vport_receive+0x19e/0x2e0 [openvswitch]\n[  778.315749]  ? ovs_vport_find_upcall_portid+0x330/0x330 [openvswitch]\n[  778.317188]  ? create_prof_cpu_mask+0x20/0x20\n[  778.318220]  ? arch_stack_walk+0x82/0xf0\n[  778.319153]  ? secondary_startup_64_no_verify+0xb0/0xbb\n[  778.320399]  ? stack_trace_save+0x91/0xc0\n[  778.321362]  ? stack_trace_consume_entry+0x160/0x160\n[  778.322517]  ? lock_release+0x52e/0x760\n[  778.323444]  netdev_frame_hook+0x323/0x610 [openvswitch]\n[  778.324668]  ? ovs_netdev_get_vport+0xe0/0xe0 [openvswitch]\n[  778.325950]  __netif_receive_skb_core+0x771/0x2db0\n[  778.327067]  ? lock_downgrade+0x6e0/0x6f0\n[  778.328021]  ? lock_acquire+0x565/0x720\n[  778.328940]  ? generic_xdp_tx+0x4f0/0x4f0\n[  778.329902]  ? inet_gro_receive+0x2a7/0x10a0\n[  778.330914]  ? lock_downgrade+0x6f0/0x6f0\n[  778.331867]  ? udp4_gro_receive+0x4c4/0x13e0\n[  778.332876]  ? lock_release+0x52e/0x760\n[  778.333808]  ? dev_gro_receive+0xcc8/0x2380\n[  778.334810]  ? lock_downgrade+0x6f0/0x6f0\n[  778.335769]  __netif_receive_skb_list_core+0x295/0x820\n[  778.336955]  ? process_backlog+0x780/0x780\n[  778.337941]  ? mlx5e_rep_tc_netdevice_event_unregister+0x20/0x20 [mlx5_core]\n[  778.339613]  ? seqcount_lockdep_reader_access.constprop.0+0xa7/0xc0\n[  778.341033]  ? kvm_clock_get_cycles+0x14/0x20\n[  778.342072]  netif_receive_skb_list_internal+0x5f5/0xcb0\n[  778.343288]  ? __kasan_kmalloc+0x7a/0x90\n[  778.344234]  ? mlx5e_handle_rx_cqe_mpwrq+0x9e0/0x9e0 [mlx5_core]\n[  778.345676]  ? mlx5e_xmit_xdp_frame_mpwqe+0x14d0/0x14d0 [mlx5_core]\n[  778.347140]  ? __netif_receive_skb_list_core+0x820/0x820\n[  778.348351]  ? mlx5e_post_rx_mpwqes+0xa6/0x25d0 [mlx5_core]\n[  778.349688]  ? napi_gro_flush+0x26c/0x3c0\n[  778.350641]  napi_complete_done+0x188/0x6b0\n[  778.351627]  mlx5e_napi_poll+0x373/0x1b80 [mlx5_core]\n[  778.352853]  __napi_poll+0x9f/0x510\n[  778.353704]  ? mlx5_flow_namespace_set_mode+0x260/0x260 [mlx5_core]\n[  778.355158]  net_rx_action+0x34c/0xa40\n[  778.356060]  ? napi_threaded_poll+0x3d0/0x3d0\n[  778.357083]  ? sched_clock_cpu+0x18/0x190\n[  778.358041]  ? __common_interrupt+0x8e/0x1a0\n[  778.359045]  __do_softirq+0x1ce/0x984\n[  778.359938]  __irq_exit_rcu+0x137/0x1d0\n[  778.360865]  irq_exit_rcu+0xa/0x20\n[  778.361708]  common_interrupt+0x80/0xa0\n[  778.362640]  </IRQ>\n[  778.363212]  asm_common_interrupt+0x1e/0x40\n[  778.364204] RIP: 0010:native_safe_halt+0xe/0x10\n[  778.365273] Code: 4f ff ff ff 4c 89 e7 e8 50 3f 40 fe e9 dc fe ff ff 48 89 df e8 43 3f 40 fe eb 90 cc e9 07 00 00 00 0f 00 2d 74 05 62 00 fb f4 <c3> 90 e9 07 00 00 00 0f 00 2d 64 05 62 00 f4 c3 cc cc 0f 1f 44 00\n[  778.369355] RSP: 0018:ffffffff84407e48 EFLAGS: 00000246\n[  778.370570] RAX\n---truncated---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: inicializaci\u00f3n cero de la extensi\u00f3n tc skb en la asignaci\u00f3n La funci\u00f3n skb_ext_add() no inicializa la extensi\u00f3n skb creada con ning\u00fan valor y lo deja en manos del usuario. Sin embargo, dado que la extensi\u00f3n de tipo TC_SKB_EXT originalmente conten\u00eda solo un valor \u00fanico tc_skb_ext-&gt;chain, sus usuarios sol\u00edan asignar simplemente el valor de la cadena sin establecer primero toda la memoria de extensi\u00f3n en cero. Esta suposici\u00f3n cambi\u00f3 cuando la extensi\u00f3n TC_SKB_EXT se ampli\u00f3 con campos adicionales, pero no todos los usuarios se actualizaron para inicializar los nuevos campos, lo que lleva al uso de memoria no inicializada posteriormente. Registro de UBSAN: [778.299821] UBSAN: carga no v\u00e1lida en net/openvswitch/flow.c:899:28 [778.301495] la carga del valor 107 no es un valor v\u00e1lido para el tipo '_Bool' [778.303215] CPU: 0 PID: 0 Comm : swapper/0 Not tainted 5.12.0-rc7+ #2 [ 778.304933] Nombre del hardware: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/ 2014 [778.307901] Seguimiento de llamadas: [778.308680]  [778.309358] dump_stack+0xbb/0x107 [778.310307] ubsan_epilogue+0x5/0x40 [778.311167] __ubsan_handle_load_invalid_value.col d+0x43/0x48 [778.312454]? memset+0x20/0x40 [778.313230] ovs_flow_key_extract.cold+0xf/0x14 [openvswitch] [778.314532] ovs_vport_receive+0x19e/0x2e0 [openvswitch] [778.315749]? ovs_vport_find_upcall_portid+0x330/0x330 [openvswitch] [778.317188]? create_prof_cpu_mask+0x20/0x20 [778.318220]? arch_stack_walk+0x82/0xf0 [778.319153]? second_startup_64_no_verify+0xb0/0xbb [778.320399]? stack_trace_save+0x91/0xc0 [778.321362]? stack_trace_consume_entry+0x160/0x160 [778.322517]? lock_release+0x52e/0x760 [778.323444] netdev_frame_hook+0x323/0x610 [openvswitch] [778.324668]? ovs_netdev_get_vport+0xe0/0xe0 [openvswitch] [778.325950] __netif_receive_skb_core+0x771/0x2db0 [778.327067]? lock_downgrade+0x6e0/0x6f0 [778.328021]? lock_acquire+0x565/0x720 [778.328940]? generic_xdp_tx+0x4f0/0x4f0 [778.329902]? inet_gro_receive+0x2a7/0x10a0 [778.330914]? lock_downgrade+0x6f0/0x6f0 [778.331867]? udp4_gro_receive+0x4c4/0x13e0 [778.332876]? lock_release+0x52e/0x760 [778.333808]? dev_gro_receive+0xcc8/0x2380 [778.334810]? lock_downgrade+0x6f0/0x6f0 [ 778.335769] __netif_receive_skb_list_core+0x295/0x820 [ 778.336955] ? proceso_backlog+0x780/0x780 [778.337941]? mlx5e_rep_tc_netdevice_event_unregister+0x20/0x20 [mlx5_core] [778.339613]? seqcount_lockdep_reader_access.constprop.0+0xa7/0xc0 [778.341033]? kvm_clock_get_cycles+0x14/0x20 [ 778.342072] netif_receive_skb_list_internal+0x5f5/0xcb0 [ 778.343288] ? __kasan_kmalloc+0x7a/0x90 [778.344234]? mlx5e_handle_rx_cqe_mpwrq+0x9e0/0x9e0 [mlx5_core] [778.345676]? mlx5e_xmit_xdp_frame_mpwqe+0x14d0/0x14d0 [mlx5_core] [778.347140]? __netif_receive_skb_list_core+0x820/0x820 [778.348351]? mlx5e_post_rx_mpwqes+0xa6/0x25d0 [mlx5_core] [778.349688]? napi_gro_flush+0x26c/0x3c0 [ 778.350641] napi_complete_done+0x188/0x6b0 [ 778.351627] mlx5e_napi_poll+0x373/0x1b80 [mlx5_core] [ 778.352853] __napi_poll+0x9f/0x510 [778.353704] ? mlx5_flow_namespace_set_mode+0x260/0x260 [mlx5_core] [778.355158] net_rx_action+0x34c/0xa40 [778.356060]? napi_threaded_poll+0x3d0/0x3d0 [778.357083]? sched_clock_cpu+0x18/0x190 [778.358041]? __common_interrupt+0x8e/0x1a0 [ 778.359045] __do_softirq+0x1ce/0x984 [ 778.359938] __irq_exit_rcu+0x137/0x1d0 [ 778.360865] irq_exit_rcu+0xa/0x20 [ 778.36170 8] interrupci\u00f3n_com\u00fan+0x80/0xa0 [ 778.362640]  [ 778.363212] asm_interrupci\u00f3n_com\u00fan+0x1e /0x40 [ 778.364204] RIP: 0010:native_safe_halt+0xe/0x10 [ 778.365273] C\u00f3digo: 4f ff ff ff 4c 89 e7 e8 50 3f 40 fe e9 dc fe ff ff 48 89 df e8 43 3f 40 fe eb 90 cc e 9 07 00 00 00 0f 00 2d 74 05 62 00 fb f4  90 e9 07 00 00 00 0f 00 2d 64 05 62 00 f4 c3 cc cc 0f 1f 44 00 [ 778.369355] RSP: 0018:ffffffff84407 e48 EFLAGS: 00000246 [778.370570] RAX ---truncado---"
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6
      }
    ]
  },
  "weaknesses": [
    {
      "source": "nvd@nist.gov",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-908"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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  "references": [
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      "url": "https://git.kernel.org/stable/c/86ab133b695ed7ba1f8786b12f4ca43137ad8c18",
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