CVE-2026-80590: Software Security Vulnerability Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-m48g-6cv9-p3rh",
  "modified" : "2026-08-31T09:30:26Z",
  "published" : "2026-08-28T09:31:45Z",
  "aliases" : [ "CVE-2026-80590" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\ninet: frags: strip GSO state from fragments before reassembly\n\nA virtio_net_hdr (tun/tap, or AF_PACKET with PACKET_VNET_HDR) can mark\nan IPv4 or IPv6 fragment as GSO; nothing relates gso_type to frag_off.\ninet_frag_reasm_prepare()/inet_frag_reasm_finish() keep the first\nfragment's skb as the head of the reassembled datagram, including its\nshinfo->gso_size/gso_type/gso_segs, and chain the remaining fragments\non frag_list with whatever linear/paged layout they arrived with.\n\nAfter ip_defrag() (ip_local_deliver(), nf_defrag_ipv4, ...) the\nreassembled skb therefore still claims to be GSO (SKB_GSO_DODGY), and\nthe next software segmentation point - udp_rcv_segment() on local\ndelivery, validate_xmit_skb(), or the ip_finish_output_gso() slow\npath - hands it to skb_segment(). skb_segment()'s frag_list walk\nassumes GRO-shaped input and hits one of its BUG_ON()s. Two writes to\na tap by an unprivileged user in its own userns are enough:\n\n  kernel BUG at net/core/skbuff.c:4899!\n  Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\n  CPU: 0 UID: 1000 PID: 82 Comm: poc Not tainted 7.2.0-pentest+ #2\n  RIP: 0010:skb_segment+0x20ca/0x48b0\n  Call Trace:\n   <TASK>\n   __udp_gso_segment+0x29a/0x27d0\n   udp4_ufo_fragment+0x458/0x6c0\n   inet_gso_segment+0x429/0x1340\n   skb_mac_gso_segment+0x233/0x4f0\n   __skb_gso_segment+0x308/0x660\n   udp_queue_rcv_skb+0x440/0xad0\n   udp_unicast_rcv_skb+0xc7/0x2c0\n   udp_rcv+0x16ce/0x2260\n   ip_protocol_deliver_rcu+0x197/0x2d0\n   ip_local_deliver+0x430/0x690\n   ip_rcv+0x16f/0x1f0\n   __netif_receive_skb_one_core+0x15e/0x1c0\n   __netif_receive_skb+0x1e/0x110\n   netif_receive_skb+0xf6/0x5c0\n   tun_rx_batched.isra.0+0x3ab/0x790\n   tun_get_user+0x17c3/0x3550\n   tun_chr_write_iter+0xba/0x1b0\n   vfs_write+0x646/0x1130\n   </TASK>\n  Kernel panic - not syncing: Fatal exception in interrupt\n\nThis runs with BH disabled, so it is a panic rather than an oops. The\nsame is reachable with CAP_NET_RAW in a netns where a defrag point\nprecedes a GSO point, and from a guest whose VMM forwards\nvirtio_net_hdr to a tap. The SKB_GSO_DODGY frag_list checks added by\ncommit 3dcbdb134f32 (\"net: gso: Fix skb_segment splat when splitting\ngso_size mangled skb having linear-headed frag_list\") and by\ncommit 9e4b7a99a03a (\"net: gso: fix panic on frag_list with mixed head\nalloc types\") do not cover it: page-backed heads skip them, and kmalloc\nheads skip them when gso_size == skb_headlen(head), which the sender\ncontrols.\n\nAn skb entering a frag queue is an IP fragment by definition and\ncannot legitimately carry GSO state: GRO does not merge fragments and\nthe stack segments before it fragments, so only untrusted sources are\naffected. This has been reachable since\ncommit f43798c27684 (\"tun: Allow GSO using virtio_net_hdr\"), the first\npath that let userspace attach GSO metadata to an IP fragment. Reset\nthe GSO fields of every fragment as it is queued, in\ninet_frag_queue_insert(), which IPv4, IPv6, nf_conntrack_reasm and\n6lowpan reassembly share; then neither the head nor the frag_list\nmembers of the reassembled skb carry them (the members matter too:\nthe ip_do_fragment()/ip6_fragment() fast paths send them out as they\nare). The head may remain CHECKSUM_PARTIAL; that is already accepted\non receive and resolved by skb_checksum_help() in\nip_do_fragment()/ip6_fragment() on forward.\n\nTested on top of net.git (dc4b95b8fee9), x86_64: the tap reproducer\nabove, two further IPv4 frag_list geometries that reach\nBUG_ON(i >= nfrags) and BUG_ON(!list_skb->head_frag), and an IPv6\nfragment-header variant (udp6_ufo_fragment()) each panic the unpatched\nkernel; with this patch all four datagrams are delivered intact and\nnothing is logged.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-80590"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/14a8f3e10fa9a5abd6cedcdaa0c0b7ea9a09f234"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/29dda278a5ed272f2230ff4eaa23cf403107bba0"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/3edf721bb4b99d272c336631b44e3d8ff9a4f31b"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/69b73b74d9eb45f5560a8fe4fa406ada580e1340"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/c49f04e8d2b94dbb8d9fd99731dd3f00589c8ace"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/cfdbc8c2e6f9ef5d8b8e54859da03dfe682b0bee"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/d5dc1e69fd7258ea605c9952e5d5947539159ae3"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/da857e448322a2e871ce3ecc2900027041160d43"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/dec2edb7aaf12a8878b3a03172ea8fc277b8eaad"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-28T08:16:42Z"
  }
}