{"id":"CVE-2024-50045","title":"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 d…","summary":"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 d…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-476"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 4.11, < 5.10.227","linux_kernel >= 5.11, < 5.15.168","linux_kernel >= 5.16, < 6.1.113","linux_kernel >= 6.2, < 6.6.57","linux_kernel >= 6.7, < 6.11.4","linux_kernel = 6.12"],"patched":["linux_kernel 6.11.4"],"published":"2024-10-21","updated":"2026-10-15","sourceUpdated":"2026-10-15T01:19:06.207","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2024-50045","references":[{"url":"https://git.kernel.org/stable/c/3453f5839420bfbb85c86c61e49f49ffd0f041c4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/75dfcb758015c97e1accd6340691fca67d363bed","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/78ed917133b118661e1fe62d4a85d5d428ee9568","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/915717e0bb9837cc5c101bc545af487bd787239e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/95c0cff5a1a5d28bf623b92eb5d1a8f56ed30803","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cce8419b8168f6e7eb637103a47f916f3de8bc81","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f07131239a76cc10d5e82c19d91f53cb55727297","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f9ff7665cd128012868098bbd07e28993e314fdb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-265688.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-355557.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00609,"epssPercentile":0.48967,"ingestedAt":"2026-10-15T03:30:12.761Z","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2024-10-22T13:24:15.720711Z"},"slug":"CVE-2024-50045","body":"## Overview\n\nIn 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---\n\n## Affected\n\n- `linux_kernel >= 4.11, < 5.10.227`\n- `linux_kernel >= 5.11, < 5.15.168`\n- `linux_kernel >= 5.16, < 6.1.113`\n- `linux_kernel >= 6.2, < 6.6.57`\n- `linux_kernel >= 6.7, < 6.11.4`\n- `linux_kernel = 6.12`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.11.4`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}