{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23095",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-23095"
  ],
  "published": "2026-02-04T16:18:56Z",
  "summary": "gue: Fix skb memleak with inner IP protocol 0.",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngue: Fix skb memleak with inner IP protocol 0.\n\nsyzbot reported skb memleak below. [0]\n\nThe repro generated a GUE packet with its inner protocol 0.\n\ngue_udp_recv() returns -guehdr->proto_ctype for \"resubmit\"\nin ip_protocol_deliver_rcu(), but this only works with\nnon-zero protocol number.\n\nLet's drop such packets.\n\nNote that 0 is a valid number (IPv6 Hop-by-Hop Option).\n\nI think it is not practical to encap HOPOPT in GUE, so once\nsomeone starts to complain, we could pass down a resubmit\nflag pointer to distinguish two zeros from the upper layer:\n\n  * no error\n  * resubmit HOPOPT\n\n[0]\nBUG: memory leak\nunreferenced object 0xffff888109695a00 (size 240):\n  comm \"syz.0.17\", pid 6088, jiffies 4294943096\n  hex dump (first 32 bytes):\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    00 40 c2 10 81 88 ff ff 00 00 00 00 00 00 00 00  .@..............\n  backtrace (crc a84b336f):\n    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]\n    slab_post_alloc_hook mm/slub.c:4958 [inline]\n    slab_alloc_node mm/slub.c:5263 [inline]\n    kmem_cache_alloc_noprof+0x3b4/0x590 mm/slub.c:5270\n    __build_skb+0x23/0x60 net/core/skbuff.c:474\n    build_skb+0x20/0x190 net/core/skbuff.c:490\n    __tun_build_skb drivers/net/tun.c:1541 [inline]\n    tun_build_skb+0x4a1/0xa40 drivers/net/tun.c:1636\n    tun_get_user+0xc12/0x2030 drivers/net/tun.c:1770\n    tun_chr_write_iter+0x71/0x120 drivers/net/tun.c:1999\n    new_sync_write fs/read_write.c:593 [inline]\n    vfs_write+0x45d/0x710 fs/read_write.c:686\n    ksys_write+0xa7/0x170 fs/read_write.c:738\n    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94\n    entry_SYSCALL_64_after_hwframe+0x77/0x7f",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-23095"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/886f186328b718400dbf79e1bc8cbcbd710ab766"
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      "url": "https://git.kernel.org/stable/c/536f5bbc322eb1e175bdd1ced22b236a951c4d8f"
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    },
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      "url": "https://git.kernel.org/stable/c/ce569b389a5c78d64788a5ea94560e17fa574b35"
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      "url": "https://git.kernel.org/stable/c/9a56796ad258786d3624eef5aefba394fc9bdded"
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  "database_specific": {
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - GUE processes incoming UDP packets from the network. Once a GUE tunnel is configured (its intended purpose in datacenter/cloud deployments), any remote attacker can send crafted UDP packets to the GUE port to trigger the leak.\nAC:L - The attacker simply sends a UDP packet with a GUE header containing proto_ctype=0. No race conditions, no special timing, and no conditions beyond the attacker's control once the GUE tunnel endpoint exists.\nPR:N - No authentication or privileges are needed to send UDP packets to a GUE tunnel endpoint. The vulnerability is in the packet receive path which processes all incoming packets without any authentication gate.\nUI:N - No user interaction is required. The vulnerability is triggered purely by receiving a crafted network packet.\nS:U - The vulnerability affects kernel memory within the same security authority. No scope boundary (VM, sandbox, IOMMU) is crossed.\nC:N - This is a pure memory leak \u2014 the skb is not freed but no memory contents are disclosed to the attacker. There is no information disclosure path.\nI:N - This is a memory leak, not a memory corruption. No kernel data structures are modified or corrupted; the skb simply becomes unreachable and is never freed.\nA:H - The attacker can repeatedly send crafted GUE packets over the network at high rate, each leaking ~240 bytes of kernel memory. This amplifiable, remotely-triggered leak can exhaust kernel memory causing OOM conditions and system-wide denial of service."
    }
  }
}