fkie_cve-2024-50045
Vulnerability from fkie_nvd
Published
2024-10-21 20:15
Modified
2024-11-08 16:15
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.12
linux linux_kernel 6.12


To clipboard 

{
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               negate: false,
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   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->dst.dev is NULL.\n\nThen in the br_netfilter hooks, in br_nf_dev_queue_xmit, there's 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->dev, 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 pánico del kernel en el módulo br_netfilter al enviar tráfico sin etiquetar a través de un dispositivo VxLAN. Esto sucede durante la comprobación de fragmentación en br_nf_dev_queue_xmit. Depende de: 1) que se esté cargando el módulo br_netfilter; 2) que net.bridge.bridge-nf-call-iptables esté 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 tamaño 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 túnel. tunnel_dst es un tipo de metadatos de dst, es decir, skb_valid_dst(skb) es falso y metadata->dst.dev es NULL. Luego, en los ganchos br_netfilter, en br_nf_dev_queue_xmit, hay una verificación de tramas que necesitan fragmentarse: las tramas con una MTU más 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 válido con dst->dev válido, de ahí 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 núcleo en la dirección virtual 0000000000000110 [ 176.292101] Información 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 traducción de nivel 0 [ 176.293013] Información 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: páginas 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] Módulos 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---",
      },
   ],
   id: "CVE-2024-50045",
   lastModified: "2024-11-08T16:15:44.813",
   metrics: {
      cvssMetricV31: [
         {
            cvssData: {
               attackComplexity: "LOW",
               attackVector: "LOCAL",
               availabilityImpact: "HIGH",
               baseScore: 5.5,
               baseSeverity: "MEDIUM",
               confidentialityImpact: "NONE",
               integrityImpact: "NONE",
               privilegesRequired: "LOW",
               scope: "UNCHANGED",
               userInteraction: "NONE",
               vectorString: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
               version: "3.1",
            },
            exploitabilityScore: 1.8,
            impactScore: 3.6,
            source: "nvd@nist.gov",
            type: "Primary",
         },
      ],
   },
   published: "2024-10-21T20:15:17.373",
   references: [
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/3453f5839420bfbb85c86c61e49f49ffd0f041c4",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         url: "https://git.kernel.org/stable/c/75dfcb758015c97e1accd6340691fca67d363bed",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         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",
         url: "https://git.kernel.org/stable/c/f07131239a76cc10d5e82c19d91f53cb55727297",
      },
      {
         source: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
         tags: [
            "Patch",
         ],
         url: "https://git.kernel.org/stable/c/f9ff7665cd128012868098bbd07e28993e314fdb",
      },
   ],
   sourceIdentifier: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
   vulnStatus: "Modified",
   weaknesses: [
      {
         description: [
            {
               lang: "en",
               value: "CWE-476",
            },
         ],
         source: "nvd@nist.gov",
         type: "Primary",
      },
   ],
}


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