cve-2024-50045
Vulnerability from cvelistv5
Published
2024-10-21 19:39
Modified
2024-12-19 09:32
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: br_netfilter: fix panic with metadata_dst skb Fix a kernel panic in the br_netfilter module when sending untagged traffic via a VxLAN device. This happens during the check for fragmentation in br_nf_dev_queue_xmit. It is dependent on: 1) the br_netfilter module being loaded; 2) net.bridge.bridge-nf-call-iptables set to 1; 3) a bridge with a VxLAN (single-vxlan-device) netdevice as a bridge port; 4) untagged frames with size higher than the VxLAN MTU forwarded/flooded When forwarding the untagged packet to the VxLAN bridge port, before the netfilter hooks are called, br_handle_egress_vlan_tunnel is called and changes the skb_dst to the tunnel dst. The tunnel_dst is a metadata type of dst, i.e., skb_valid_dst(skb) is false, and metadata->dst.dev is NULL. Then in the br_netfilter hooks, in br_nf_dev_queue_xmit, there's a check for frames that needs to be fragmented: frames with higher MTU than the VxLAN device end up calling br_nf_ip_fragment, which in turns call ip_skb_dst_mtu. The ip_dst_mtu tries to use the skb_dst(skb) as if it was a valid dst with valid dst->dev, thus the crash. This case was never supported in the first place, so drop the packet instead. PING 10.0.0.2 (10.0.0.2) from 0.0.0.0 h1-eth0: 2000(2028) bytes of data. [ 176.291791] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000110 [ 176.292101] Mem abort info: [ 176.292184] ESR = 0x0000000096000004 [ 176.292322] EC = 0x25: DABT (current EL), IL = 32 bits [ 176.292530] SET = 0, FnV = 0 [ 176.292709] EA = 0, S1PTW = 0 [ 176.292862] FSC = 0x04: level 0 translation fault [ 176.293013] Data abort info: [ 176.293104] ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 [ 176.293488] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 [ 176.293787] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 176.293995] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000043ef5000 [ 176.294166] [0000000000000110] pgd=0000000000000000, p4d=0000000000000000 [ 176.294827] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP [ 176.295252] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel veth br_netfilter bridge stp llc ipv6 crct10dif_ce [ 176.295923] CPU: 0 PID: 188 Comm: ping Not tainted 6.8.0-rc3-g5b3fbd61b9d1 #2 [ 176.296314] Hardware name: linux,dummy-virt (DT) [ 176.296535] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 176.296808] pc : br_nf_dev_queue_xmit+0x390/0x4ec [br_netfilter] [ 176.297382] lr : br_nf_dev_queue_xmit+0x2ac/0x4ec [br_netfilter] [ 176.297636] sp : ffff800080003630 [ 176.297743] x29: ffff800080003630 x28: 0000000000000008 x27: ffff6828c49ad9f8 [ 176.298093] x26: ffff6828c49ad000 x25: 0000000000000000 x24: 00000000000003e8 [ 176.298430] x23: 0000000000000000 x22: ffff6828c4960b40 x21: ffff6828c3b16d28 [ 176.298652] x20: ffff6828c3167048 x19: ffff6828c3b16d00 x18: 0000000000000014 [ 176.298926] x17: ffffb0476322f000 x16: ffffb7e164023730 x15: 0000000095744632 [ 176.299296] x14: ffff6828c3f1c880 x13: 0000000000000002 x12: ffffb7e137926a70 [ 176.299574] x11: 0000000000000001 x10: ffff6828c3f1c898 x9 : 0000000000000000 [ 176.300049] x8 : ffff6828c49bf070 x7 : 0008460f18d5f20e x6 : f20e0100bebafeca [ 176.300302] x5 : ffff6828c7f918fe x4 : ffff6828c49bf070 x3 : 0000000000000000 [ 176.300586] x2 : 0000000000000000 x1 : ffff6828c3c7ad00 x0 : ffff6828c7f918f0 [ 176.300889] Call trace: [ 176.301123] br_nf_dev_queue_xmit+0x390/0x4ec [br_netfilter] [ 176.301411] br_nf_post_routing+0x2a8/0x3e4 [br_netfilter] [ 176.301703] nf_hook_slow+0x48/0x124 [ 176.302060] br_forward_finish+0xc8/0xe8 [bridge] [ 176.302371] br_nf_hook_thresh+0x124/0x134 [br_netfilter] [ 176.302605] br_nf_forward_finish+0x118/0x22c [br_netfilter] [ 176.302824] br_nf_forward_ip.part.0+0x264/0x290 [br_netfilter] [ 176.303136] br_nf_forward+0x2b8/0x4e0 [br_netfilter] [ 176.303359] nf_hook_slow+0x48/0x124 [ 176.303 ---truncated---
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3453f5839420bfbb85c86c61e49f49ffd0f041c4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/75dfcb758015c97e1accd6340691fca67d363bed
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/78ed917133b118661e1fe62d4a85d5d428ee9568Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/915717e0bb9837cc5c101bc545af487bd787239ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/95c0cff5a1a5d28bf623b92eb5d1a8f56ed30803Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cce8419b8168f6e7eb637103a47f916f3de8bc81Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f07131239a76cc10d5e82c19d91f53cb55727297
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f9ff7665cd128012868098bbd07e28993e314fdbPatch
Impacted products
Vendor Product Version
Linux Linux Version: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd
Version: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd
Version: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd
Version: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd
Version: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd
Version: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd
Version: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd
Version: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd
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{
  "containers": {
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      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-50045",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-10-22T13:24:15.720711Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-10-22T13:28:43.698Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bridge/br_netfilter_hooks.c"
          ],
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bridge/br_netfilter_hooks.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.11"
            },
            {
              "lessThan": "4.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.323",
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            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.285",
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            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.227",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.168",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.11.*",
              "status": "unaffected",
              "version": "6.11.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.12",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: br_netfilter: fix panic with metadata_dst skb\n\nFix a kernel panic in the br_netfilter module when sending untagged\ntraffic via a VxLAN device.\nThis happens during the check for fragmentation in br_nf_dev_queue_xmit.\n\nIt is dependent on:\n1) the br_netfilter module being loaded;\n2) net.bridge.bridge-nf-call-iptables set to 1;\n3) a bridge with a VxLAN (single-vxlan-device) netdevice as a bridge port;\n4) untagged frames with size higher than the VxLAN MTU forwarded/flooded\n\nWhen forwarding the untagged packet to the VxLAN bridge port, before\nthe netfilter hooks are called, br_handle_egress_vlan_tunnel is called and\nchanges the skb_dst to the tunnel dst. The tunnel_dst is a metadata type\nof dst, i.e., skb_valid_dst(skb) is false, and metadata-\u003edst.dev is NULL.\n\nThen in the br_netfilter hooks, in br_nf_dev_queue_xmit, there\u0027s a check\nfor frames that needs to be fragmented: frames with higher MTU than the\nVxLAN device end up calling br_nf_ip_fragment, which in turns call\nip_skb_dst_mtu.\n\nThe ip_dst_mtu tries to use the skb_dst(skb) as if it was a valid dst\nwith valid dst-\u003edev, thus the crash.\n\nThis case was never supported in the first place, so drop the packet\ninstead.\n\nPING 10.0.0.2 (10.0.0.2) from 0.0.0.0 h1-eth0: 2000(2028) bytes of data.\n[  176.291791] Unable to handle kernel NULL pointer dereference at\nvirtual address 0000000000000110\n[  176.292101] Mem abort info:\n[  176.292184]   ESR = 0x0000000096000004\n[  176.292322]   EC = 0x25: DABT (current EL), IL = 32 bits\n[  176.292530]   SET = 0, FnV = 0\n[  176.292709]   EA = 0, S1PTW = 0\n[  176.292862]   FSC = 0x04: level 0 translation fault\n[  176.293013] Data abort info:\n[  176.293104]   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000\n[  176.293488]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n[  176.293787]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n[  176.293995] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000043ef5000\n[  176.294166] [0000000000000110] pgd=0000000000000000,\np4d=0000000000000000\n[  176.294827] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP\n[  176.295252] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel veth\nbr_netfilter bridge stp llc ipv6 crct10dif_ce\n[  176.295923] CPU: 0 PID: 188 Comm: ping Not tainted\n6.8.0-rc3-g5b3fbd61b9d1 #2\n[  176.296314] Hardware name: linux,dummy-virt (DT)\n[  176.296535] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS\nBTYPE=--)\n[  176.296808] pc : br_nf_dev_queue_xmit+0x390/0x4ec [br_netfilter]\n[  176.297382] lr : br_nf_dev_queue_xmit+0x2ac/0x4ec [br_netfilter]\n[  176.297636] sp : ffff800080003630\n[  176.297743] x29: ffff800080003630 x28: 0000000000000008 x27:\nffff6828c49ad9f8\n[  176.298093] x26: ffff6828c49ad000 x25: 0000000000000000 x24:\n00000000000003e8\n[  176.298430] x23: 0000000000000000 x22: ffff6828c4960b40 x21:\nffff6828c3b16d28\n[  176.298652] x20: ffff6828c3167048 x19: ffff6828c3b16d00 x18:\n0000000000000014\n[  176.298926] x17: ffffb0476322f000 x16: ffffb7e164023730 x15:\n0000000095744632\n[  176.299296] x14: ffff6828c3f1c880 x13: 0000000000000002 x12:\nffffb7e137926a70\n[  176.299574] x11: 0000000000000001 x10: ffff6828c3f1c898 x9 :\n0000000000000000\n[  176.300049] x8 : ffff6828c49bf070 x7 : 0008460f18d5f20e x6 :\nf20e0100bebafeca\n[  176.300302] x5 : ffff6828c7f918fe x4 : ffff6828c49bf070 x3 :\n0000000000000000\n[  176.300586] x2 : 0000000000000000 x1 : ffff6828c3c7ad00 x0 :\nffff6828c7f918f0\n[  176.300889] Call trace:\n[  176.301123]  br_nf_dev_queue_xmit+0x390/0x4ec [br_netfilter]\n[  176.301411]  br_nf_post_routing+0x2a8/0x3e4 [br_netfilter]\n[  176.301703]  nf_hook_slow+0x48/0x124\n[  176.302060]  br_forward_finish+0xc8/0xe8 [bridge]\n[  176.302371]  br_nf_hook_thresh+0x124/0x134 [br_netfilter]\n[  176.302605]  br_nf_forward_finish+0x118/0x22c [br_netfilter]\n[  176.302824]  br_nf_forward_ip.part.0+0x264/0x290 [br_netfilter]\n[  176.303136]  br_nf_forward+0x2b8/0x4e0 [br_netfilter]\n[  176.303359]  nf_hook_slow+0x48/0x124\n[  176.303\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T09:32:01.141Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f07131239a76cc10d5e82c19d91f53cb55727297"
        },
        {
          "url": "https://git.kernel.org/stable/c/75dfcb758015c97e1accd6340691fca67d363bed"
        },
        {
          "url": "https://git.kernel.org/stable/c/cce8419b8168f6e7eb637103a47f916f3de8bc81"
        },
        {
          "url": "https://git.kernel.org/stable/c/95c0cff5a1a5d28bf623b92eb5d1a8f56ed30803"
        },
        {
          "url": "https://git.kernel.org/stable/c/78ed917133b118661e1fe62d4a85d5d428ee9568"
        },
        {
          "url": "https://git.kernel.org/stable/c/3453f5839420bfbb85c86c61e49f49ffd0f041c4"
        },
        {
          "url": "https://git.kernel.org/stable/c/915717e0bb9837cc5c101bc545af487bd787239e"
        },
        {
          "url": "https://git.kernel.org/stable/c/f9ff7665cd128012868098bbd07e28993e314fdb"
        }
      ],
      "title": "netfilter: br_netfilter: fix panic with metadata_dst skb",
      "x_generator": {
        "engine": "bippy-5f407fcff5a0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-50045",
    "datePublished": "2024-10-21T19:39:43.117Z",
    "dateReserved": "2024-10-21T12:17:06.071Z",
    "dateUpdated": "2024-12-19T09:32:01.141Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-50045\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T20:15:17.373\",\"lastModified\":\"2024-11-08T16:15:44.813\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: br_netfilter: fix panic with metadata_dst skb\\n\\nFix a kernel panic in the br_netfilter module when sending untagged\\ntraffic via a VxLAN device.\\nThis happens during the check for fragmentation in br_nf_dev_queue_xmit.\\n\\nIt is dependent on:\\n1) the br_netfilter module being loaded;\\n2) net.bridge.bridge-nf-call-iptables set to 1;\\n3) a bridge with a VxLAN (single-vxlan-device) netdevice as a bridge port;\\n4) untagged frames with size higher than the VxLAN MTU forwarded/flooded\\n\\nWhen forwarding the untagged packet to the VxLAN bridge port, before\\nthe netfilter hooks are called, br_handle_egress_vlan_tunnel is called and\\nchanges the skb_dst to the tunnel dst. The tunnel_dst is a metadata type\\nof dst, i.e., skb_valid_dst(skb) is false, and metadata-\u003edst.dev is NULL.\\n\\nThen in the br_netfilter hooks, in br_nf_dev_queue_xmit, there\u0027s a check\\nfor frames that needs to be fragmented: frames with higher MTU than the\\nVxLAN device end up calling br_nf_ip_fragment, which in turns call\\nip_skb_dst_mtu.\\n\\nThe ip_dst_mtu tries to use the skb_dst(skb) as if it was a valid dst\\nwith valid dst-\u003edev, thus the crash.\\n\\nThis case was never supported in the first place, so drop the packet\\ninstead.\\n\\nPING 10.0.0.2 (10.0.0.2) from 0.0.0.0 h1-eth0: 2000(2028) bytes of data.\\n[  176.291791] Unable to handle kernel NULL pointer dereference at\\nvirtual address 0000000000000110\\n[  176.292101] Mem abort info:\\n[  176.292184]   ESR = 0x0000000096000004\\n[  176.292322]   EC = 0x25: DABT (current EL), IL = 32 bits\\n[  176.292530]   SET = 0, FnV = 0\\n[  176.292709]   EA = 0, S1PTW = 0\\n[  176.292862]   FSC = 0x04: level 0 translation fault\\n[  176.293013] Data abort info:\\n[  176.293104]   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000\\n[  176.293488]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0\\n[  176.293787]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\\n[  176.293995] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000043ef5000\\n[  176.294166] [0000000000000110] pgd=0000000000000000,\\np4d=0000000000000000\\n[  176.294827] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP\\n[  176.295252] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel veth\\nbr_netfilter bridge stp llc ipv6 crct10dif_ce\\n[  176.295923] CPU: 0 PID: 188 Comm: ping Not tainted\\n6.8.0-rc3-g5b3fbd61b9d1 #2\\n[  176.296314] Hardware name: linux,dummy-virt (DT)\\n[  176.296535] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS\\nBTYPE=--)\\n[  176.296808] pc : br_nf_dev_queue_xmit+0x390/0x4ec [br_netfilter]\\n[  176.297382] lr : br_nf_dev_queue_xmit+0x2ac/0x4ec [br_netfilter]\\n[  176.297636] sp : ffff800080003630\\n[  176.297743] x29: ffff800080003630 x28: 0000000000000008 x27:\\nffff6828c49ad9f8\\n[  176.298093] x26: ffff6828c49ad000 x25: 0000000000000000 x24:\\n00000000000003e8\\n[  176.298430] x23: 0000000000000000 x22: ffff6828c4960b40 x21:\\nffff6828c3b16d28\\n[  176.298652] x20: ffff6828c3167048 x19: ffff6828c3b16d00 x18:\\n0000000000000014\\n[  176.298926] x17: ffffb0476322f000 x16: ffffb7e164023730 x15:\\n0000000095744632\\n[  176.299296] x14: ffff6828c3f1c880 x13: 0000000000000002 x12:\\nffffb7e137926a70\\n[  176.299574] x11: 0000000000000001 x10: ffff6828c3f1c898 x9 :\\n0000000000000000\\n[  176.300049] x8 : ffff6828c49bf070 x7 : 0008460f18d5f20e x6 :\\nf20e0100bebafeca\\n[  176.300302] x5 : ffff6828c7f918fe x4 : ffff6828c49bf070 x3 :\\n0000000000000000\\n[  176.300586] x2 : 0000000000000000 x1 : ffff6828c3c7ad00 x0 :\\nffff6828c7f918f0\\n[  176.300889] Call trace:\\n[  176.301123]  br_nf_dev_queue_xmit+0x390/0x4ec [br_netfilter]\\n[  176.301411]  br_nf_post_routing+0x2a8/0x3e4 [br_netfilter]\\n[  176.301703]  nf_hook_slow+0x48/0x124\\n[  176.302060]  br_forward_finish+0xc8/0xe8 [bridge]\\n[  176.302371]  br_nf_hook_thresh+0x124/0x134 [br_netfilter]\\n[  176.302605]  br_nf_forward_finish+0x118/0x22c [br_netfilter]\\n[  176.302824]  br_nf_forward_ip.part.0+0x264/0x290 [br_netfilter]\\n[  176.303136]  br_nf_forward+0x2b8/0x4e0 [br_netfilter]\\n[  176.303359]  nf_hook_slow+0x48/0x124\\n[  176.303\\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: br_netfilter: fix panic with metadata_dst skb Corrige un p\u00e1nico del kernel en el m\u00f3dulo br_netfilter al enviar tr\u00e1fico sin etiquetar a trav\u00e9s de un dispositivo VxLAN. Esto sucede durante la comprobaci\u00f3n de fragmentaci\u00f3n en br_nf_dev_queue_xmit. Depende de: 1) que se est\u00e9 cargando el m\u00f3dulo br_netfilter; 2) que net.bridge.bridge-nf-call-iptables est\u00e9 establecido en 1; 3) que haya un puente con un netdevice VxLAN (single-vxlan-device) como puerto de puente; 4) que se hayan reenviado o inundado tramas sin etiquetar con un tama\u00f1o superior a la MTU de VxLAN. Al reenviar el paquete sin etiquetar al puerto de puente VxLAN, antes de que se llamen los ganchos de netfilter, se llama a br_handle_egress_vlan_tunnel y cambia skb_dst al dst del t\u00fanel. tunnel_dst es un tipo de metadatos de dst, es decir, skb_valid_dst(skb) es falso y metadata-\u0026gt;dst.dev es NULL. Luego, en los ganchos br_netfilter, en br_nf_dev_queue_xmit, hay una verificaci\u00f3n de tramas que necesitan fragmentarse: las tramas con una MTU m\u00e1s alta que el dispositivo VxLAN terminan llamando a br_nf_ip_fragment, que a su vez llama a ip_skb_dst_mtu. ip_dst_mtu intenta usar skb_dst(skb) como si fuera un dst v\u00e1lido con dst-\u0026gt;dev v\u00e1lido, de ah\u00ed el bloqueo. Este caso nunca fue compatible en primer lugar, por lo que descarta el paquete en su lugar. PING 10.0.0.2 (10.0.0.2) desde 0.0.0.0 h1-eth0: 2000(2028) bytes de datos. [ 176.291791] No se puede manejar la desreferencia del puntero NULL del n\u00facleo en la direcci\u00f3n virtual 0000000000000110 [ 176.292101] Informaci\u00f3n de aborto de memoria: [ 176.292184] ESR = 0x0000000096000004 [ 176.292322] EC = 0x25: DABT (EL actual), IL = 32 bits [ 176.292530] SET = 0, FnV = 0 [ 176.292709] EA = 0, S1PTW = 0 [ 176.292862] FSC = 0x04: error de traducci\u00f3n de nivel 0 [ 176.293013] Informaci\u00f3n de aborto de datos: [ 176.293104] ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 [ 176.293488] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 [ 176.293787] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 176.293995] pgtable del usuario: p\u00e1ginas de 4k, VA de 48 bits, pgdp=0000000043ef5000 [ 176.294166] [0000000000000110] pgd=000000000000000, p4d=0000000000000000 [ 176.294827] Error interno: Oops: 0000000096000004 [#1] PREEMPT SMP [ 176.295252] M\u00f3dulos vinculados: vxlan ip6_udp_tunnel udp_tunnel veth br_netfilter bridge stp llc ipv6 crct10dif_ce [ 176.295923] CPU: 0 PID: 188 Comm: ping No contaminado 6.8.0-rc3-g5b3fbd61b9d1 #2 [ 176.296314] Nombre del hardware: linux,dummy-virt (DT) [ 176.296535] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 176.296808] pc : br_nf_dev_queue_xmit+0x390/0x4ec [br_netfilter] [ 176.297382] lr : br_nf_dev_queue_xmit+0x2ac/0x4ec [br_netfilter] [ 176.297636] sp : ffff800080003630 [ 176.297743] x29: ffff800080003630 x28: 0000000000000008 x27: ffff6828c49ad9f8 [ 176.298093] x26: ffff6828c49ad000 x25: 0000000000000000 x24: 00000000000003e8 [ 176.298430] x23: 0000000000000000 x22: ffff6828c4960b40 x21: ffff6828c3b16d28 [ 176.298652] x20: ffff6828c3167048 x19: ffff6828c3b16d00 x18: 0000000000000014 [ 176.298926] x17: ffffb0476322f000 x16: ffffb7e164023730 x15: 0000000095744632 [ 176.299296] x14: ffff6828c3f1c880 x13: 0000000000000002 x12: ffffb7e137926a70 [ 176.299574] x11: 000000000000001 x10: ffff6828c3f1c898 x9: 0000000000000000 [ 176.300049] x8: ffff6828c49bf070 x7: 0008460f18d5f20e x6: f20e0100bebafeca [ 176.300302] x5 : ffff6828c7f918fe x4 : ffff6828c49bf070 x3 : 0000000000000000 [ 176.300586] x2 : 0000000000000000 x1 : ffff6828c3c7ad00 x0 : ffff6828c7f918f0 [ 176.300889] Rastreo de llamadas: [ 176.301123] br_nf_dev_queue_xmit+0x390/0x4ec [br_netfilter] [ 176.301411] br_nf_post_routing+0x2a8/0x3e4 [br_netfilter] [ 176.301703] br_nf_hook_slow+0x48/0x124 [ 176.302060] br_forward_finish+0xc8/0xe8 [puente] [ 176.302371] br_nf_hook_thresh+0x124/0x134 [br_filtro de red] [ 176.302605] br_nf_forward_finish+0x118/0x22c [br_filtro de red] [ 176.302824] br_nf_forward_ip.part.0+0x264/0x290 [br_filtro de red] [ 176.303136 ---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-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.11\",\"versionEndExcluding\":\"5.10.227\",\"matchCriteriaId\":\"E02B18E0-7618-4F55-A9D9-FC9A13DCDEEF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.168\",\"matchCriteriaId\":\"4D51C05D-455B-4D8D-89E7-A58E140B864C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.113\",\"matchCriteriaId\":\"D01BD22E-ACD1-4618-9D01-6116570BE1EE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.57\",\"matchCriteriaId\":\"05D83DB8-7465-4F88-AFB2-980011992AC1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.11.4\",\"matchCriteriaId\":\"AA84D336-CE9A-4535-B901-1AD77EC17C34\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"7F361E1D-580F-4A2D-A509-7615F73167A1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"925478D0-3E3D-4E6F-ACD5-09F28D5DF82C\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3453f5839420bfbb85c86c61e49f49ffd0f041c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/75dfcb758015c97e1accd6340691fca67d363bed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78ed917133b118661e1fe62d4a85d5d428ee9568\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/915717e0bb9837cc5c101bc545af487bd787239e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/95c0cff5a1a5d28bf623b92eb5d1a8f56ed30803\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cce8419b8168f6e7eb637103a47f916f3de8bc81\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f07131239a76cc10d5e82c19d91f53cb55727297\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f9ff7665cd128012868098bbd07e28993e314fdb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-50045\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:24:15.720711Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:24:18.789Z\"}}], \"cna\": {\"title\": \"netfilter: br_netfilter: fix panic with metadata_dst skb\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"11538d039ac6efcf4f1a6c536e1b87cd3668a9fd\", \"lessThan\": \"f07131239a76cc10d5e82c19d91f53cb55727297\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"11538d039ac6efcf4f1a6c536e1b87cd3668a9fd\", \"lessThan\": \"75dfcb758015c97e1accd6340691fca67d363bed\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"11538d039ac6efcf4f1a6c536e1b87cd3668a9fd\", \"lessThan\": \"cce8419b8168f6e7eb637103a47f916f3de8bc81\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"11538d039ac6efcf4f1a6c536e1b87cd3668a9fd\", \"lessThan\": \"95c0cff5a1a5d28bf623b92eb5d1a8f56ed30803\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"11538d039ac6efcf4f1a6c536e1b87cd3668a9fd\", \"lessThan\": \"78ed917133b118661e1fe62d4a85d5d428ee9568\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"11538d039ac6efcf4f1a6c536e1b87cd3668a9fd\", \"lessThan\": \"3453f5839420bfbb85c86c61e49f49ffd0f041c4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"11538d039ac6efcf4f1a6c536e1b87cd3668a9fd\", \"lessThan\": \"915717e0bb9837cc5c101bc545af487bd787239e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"11538d039ac6efcf4f1a6c536e1b87cd3668a9fd\", \"lessThan\": \"f9ff7665cd128012868098bbd07e28993e314fdb\", \"versionType\": \"git\"}], \"programFiles\": [\"net/bridge/br_netfilter_hooks.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.11\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.11\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.323\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.285\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.227\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.113\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.57\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/bridge/br_netfilter_hooks.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/f07131239a76cc10d5e82c19d91f53cb55727297\"}, {\"url\": \"https://git.kernel.org/stable/c/75dfcb758015c97e1accd6340691fca67d363bed\"}, {\"url\": \"https://git.kernel.org/stable/c/cce8419b8168f6e7eb637103a47f916f3de8bc81\"}, {\"url\": \"https://git.kernel.org/stable/c/95c0cff5a1a5d28bf623b92eb5d1a8f56ed30803\"}, {\"url\": \"https://git.kernel.org/stable/c/78ed917133b118661e1fe62d4a85d5d428ee9568\"}, {\"url\": \"https://git.kernel.org/stable/c/3453f5839420bfbb85c86c61e49f49ffd0f041c4\"}, {\"url\": \"https://git.kernel.org/stable/c/915717e0bb9837cc5c101bc545af487bd787239e\"}, {\"url\": \"https://git.kernel.org/stable/c/f9ff7665cd128012868098bbd07e28993e314fdb\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: br_netfilter: fix panic with metadata_dst skb\\n\\nFix a kernel panic in the br_netfilter module when sending untagged\\ntraffic via a VxLAN device.\\nThis happens during the check for fragmentation in br_nf_dev_queue_xmit.\\n\\nIt is dependent on:\\n1) the br_netfilter module being loaded;\\n2) net.bridge.bridge-nf-call-iptables set to 1;\\n3) a bridge with a VxLAN (single-vxlan-device) netdevice as a bridge port;\\n4) untagged frames with size higher than the VxLAN MTU forwarded/flooded\\n\\nWhen forwarding the untagged packet to the VxLAN bridge port, before\\nthe netfilter hooks are called, br_handle_egress_vlan_tunnel is called and\\nchanges the skb_dst to the tunnel dst. The tunnel_dst is a metadata type\\nof dst, i.e., skb_valid_dst(skb) is false, and metadata-\u003edst.dev is NULL.\\n\\nThen in the br_netfilter hooks, in br_nf_dev_queue_xmit, there\u0027s a check\\nfor frames that needs to be fragmented: frames with higher MTU than the\\nVxLAN device end up calling br_nf_ip_fragment, which in turns call\\nip_skb_dst_mtu.\\n\\nThe ip_dst_mtu tries to use the skb_dst(skb) as if it was a valid dst\\nwith valid dst-\u003edev, thus the crash.\\n\\nThis case was never supported in the first place, so drop the packet\\ninstead.\\n\\nPING 10.0.0.2 (10.0.0.2) from 0.0.0.0 h1-eth0: 2000(2028) bytes of data.\\n[  176.291791] Unable to handle kernel NULL pointer dereference at\\nvirtual address 0000000000000110\\n[  176.292101] Mem abort info:\\n[  176.292184]   ESR = 0x0000000096000004\\n[  176.292322]   EC = 0x25: DABT (current EL), IL = 32 bits\\n[  176.292530]   SET = 0, FnV = 0\\n[  176.292709]   EA = 0, S1PTW = 0\\n[  176.292862]   FSC = 0x04: level 0 translation fault\\n[  176.293013] Data abort info:\\n[  176.293104]   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000\\n[  176.293488]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0\\n[  176.293787]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\\n[  176.293995] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000043ef5000\\n[  176.294166] [0000000000000110] pgd=0000000000000000,\\np4d=0000000000000000\\n[  176.294827] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP\\n[  176.295252] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel veth\\nbr_netfilter bridge stp llc ipv6 crct10dif_ce\\n[  176.295923] CPU: 0 PID: 188 Comm: ping Not tainted\\n6.8.0-rc3-g5b3fbd61b9d1 #2\\n[  176.296314] Hardware name: linux,dummy-virt (DT)\\n[  176.296535] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS\\nBTYPE=--)\\n[  176.296808] pc : br_nf_dev_queue_xmit+0x390/0x4ec [br_netfilter]\\n[  176.297382] lr : br_nf_dev_queue_xmit+0x2ac/0x4ec [br_netfilter]\\n[  176.297636] sp : ffff800080003630\\n[  176.297743] x29: ffff800080003630 x28: 0000000000000008 x27:\\nffff6828c49ad9f8\\n[  176.298093] x26: ffff6828c49ad000 x25: 0000000000000000 x24:\\n00000000000003e8\\n[  176.298430] x23: 0000000000000000 x22: ffff6828c4960b40 x21:\\nffff6828c3b16d28\\n[  176.298652] x20: ffff6828c3167048 x19: ffff6828c3b16d00 x18:\\n0000000000000014\\n[  176.298926] x17: ffffb0476322f000 x16: ffffb7e164023730 x15:\\n0000000095744632\\n[  176.299296] x14: ffff6828c3f1c880 x13: 0000000000000002 x12:\\nffffb7e137926a70\\n[  176.299574] x11: 0000000000000001 x10: ffff6828c3f1c898 x9 :\\n0000000000000000\\n[  176.300049] x8 : ffff6828c49bf070 x7 : 0008460f18d5f20e x6 :\\nf20e0100bebafeca\\n[  176.300302] x5 : ffff6828c7f918fe x4 : ffff6828c49bf070 x3 :\\n0000000000000000\\n[  176.300586] x2 : 0000000000000000 x1 : ffff6828c3c7ad00 x0 :\\nffff6828c7f918f0\\n[  176.300889] Call trace:\\n[  176.301123]  br_nf_dev_queue_xmit+0x390/0x4ec [br_netfilter]\\n[  176.301411]  br_nf_post_routing+0x2a8/0x3e4 [br_netfilter]\\n[  176.301703]  nf_hook_slow+0x48/0x124\\n[  176.302060]  br_forward_finish+0xc8/0xe8 [bridge]\\n[  176.302371]  br_nf_hook_thresh+0x124/0x134 [br_netfilter]\\n[  176.302605]  br_nf_forward_finish+0x118/0x22c [br_netfilter]\\n[  176.302824]  br_nf_forward_ip.part.0+0x264/0x290 [br_netfilter]\\n[  176.303136]  br_nf_forward+0x2b8/0x4e0 [br_netfilter]\\n[  176.303359]  nf_hook_slow+0x48/0x124\\n[  176.303\\n---truncated---\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T09:32:01.141Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-50045\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T09:32:01.141Z\", \"dateReserved\": \"2024-10-21T12:17:06.071Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T19:39:43.117Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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