{
   affected: [],
   aliases: [
      "CVE-2024-35941",
   ],
   database_specific: {
      cwe_ids: [],
      github_reviewed: false,
      github_reviewed_at: null,
      nvd_published_at: "2024-05-19T11:15:49Z",
      severity: null,
   },
   details: "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: add overflow debug check to pull/push helpers\n\nsyzbot managed to trigger following splat:\nBUG: KASAN: use-after-free in __skb_flow_dissect+0x4a3b/0x5e50\nRead of size 1 at addr ffff888208a4000e by task a.out/2313\n[..]\n  __skb_flow_dissect+0x4a3b/0x5e50\n  __skb_get_hash+0xb4/0x400\n  ip_tunnel_xmit+0x77e/0x26f0\n  ipip_tunnel_xmit+0x298/0x410\n  ..\n\nAnalysis shows that the skb has a valid ->head, but bogus ->data\npointer.\n\nskb->data gets its bogus value via the neigh layer, which does:\n\n1556    __skb_pull(skb, skb_network_offset(skb));\n\n... and the skb was already dodgy at this point:\n\nskb_network_offset(skb) returns a negative value due to an\nearlier overflow of skb->network_header (u16).  __skb_pull thus\n\"adjusts\" skb->data by a huge offset, pointing outside skb->head\narea.\n\nAllow debug builds to splat when we try to pull/push more than\nINT_MAX bytes.\n\nAfter this, the syzkaller reproducer yields a more precise splat\nbefore the flow dissector attempts to read off skb->data memory:\n\nWARNING: CPU: 5 PID: 2313 at include/linux/skbuff.h:2653 neigh_connected_output+0x28e/0x400\n  ip_finish_output2+0xb25/0xed0\n  iptunnel_xmit+0x4ff/0x870\n  ipgre_xmit+0x78e/0xbb0",
   id: "GHSA-f3c9-5q5h-57m3",
   modified: "2024-05-19T12:30:39Z",
   published: "2024-05-19T12:30:39Z",
   references: [
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2024-35941",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/1b2b26595bb09febf14c5444c873ac4ec90a5a77",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/219eee9c0d16f1b754a8b85275854ab17df0850a",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/8af60bb2b215f478b886f1d6d302fefa7f0b917d",
      },
      {
         type: "WEB",
         url: "https://git.kernel.org/stable/c/fff05b2b004d9a8a2416d08647f3dc9068e357c8",
      },
   ],
   schema_version: "1.4.0",
   severity: [],
}