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GHSA-968H-6229-65GG

Vulnerability from github – Published: 2024-07-12 15:31 – Updated: 2025-11-04 00:30
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

seg6: fix parameter passing when calling NF_HOOK() in End.DX4 and End.DX6 behaviors

input_action_end_dx4() and input_action_end_dx6() are called NF_HOOK() for PREROUTING hook, in PREROUTING hook, we should passing a valid indev, and a NULL outdev to NF_HOOK(), otherwise may trigger a NULL pointer dereference, as below:

[74830.647293] BUG: kernel NULL pointer dereference, address: 0000000000000090
[74830.655633] #PF: supervisor read access in kernel mode
[74830.657888] #PF: error_code(0x0000) - not-present page
[74830.659500] PGD 0 P4D 0
[74830.660450] Oops: 0000 [#1] PREEMPT SMP PTI
...
[74830.664953] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
[74830.666569] RIP: 0010:rpfilter_mt+0x44/0x15e [ipt_rpfilter]
...
[74830.689725] Call Trace:
[74830.690402]  <IRQ>
[74830.690953]  ? show_trace_log_lvl+0x1c4/0x2df
[74830.692020]  ? show_trace_log_lvl+0x1c4/0x2df
[74830.693095]  ? ipt_do_table+0x286/0x710 [ip_tables]
[74830.694275]  ? __die_body.cold+0x8/0xd
[74830.695205]  ? page_fault_oops+0xac/0x140
[74830.696244]  ? exc_page_fault+0x62/0x150
[74830.697225]  ? asm_exc_page_fault+0x22/0x30
[74830.698344]  ? rpfilter_mt+0x44/0x15e [ipt_rpfilter]
[74830.699540]  ipt_do_table+0x286/0x710 [ip_tables]
[74830.700758]  ? ip6_route_input+0x19d/0x240
[74830.701752]  nf_hook_slow+0x3f/0xb0
[74830.702678]  input_action_end_dx4+0x19b/0x1e0
[74830.703735]  ? input_action_end_t+0xe0/0xe0
[74830.704734]  seg6_local_input_core+0x2d/0x60
[74830.705782]  lwtunnel_input+0x5b/0xb0
[74830.706690]  __netif_receive_skb_one_core+0x63/0xa0
[74830.707825]  process_backlog+0x99/0x140
[74830.709538]  __napi_poll+0x2c/0x160
[74830.710673]  net_rx_action+0x296/0x350
[74830.711860]  __do_softirq+0xcb/0x2ac
[74830.713049]  do_softirq+0x63/0x90

input_action_end_dx4() passing a NULL indev to NF_HOOK(), and finally trigger a NULL dereference in rpfilter_mt()->rpfilter_is_loopback():

static bool
rpfilter_is_loopback(const struct sk_buff *skb,
               const struct net_device *in)
{
        // in is NULL
        return skb->pkt_type == PACKET_LOOPBACK ||
         in->flags & IFF_LOOPBACK;
}
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2024-40957"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-12T13:15:17Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nseg6: fix parameter passing when calling NF_HOOK() in End.DX4 and End.DX6 behaviors\n\ninput_action_end_dx4() and input_action_end_dx6() are called NF_HOOK() for\nPREROUTING hook, in PREROUTING hook, we should passing a valid indev,\nand a NULL outdev to NF_HOOK(), otherwise may trigger a NULL pointer\ndereference, as below:\n\n    [74830.647293] BUG: kernel NULL pointer dereference, address: 0000000000000090\n    [74830.655633] #PF: supervisor read access in kernel mode\n    [74830.657888] #PF: error_code(0x0000) - not-present page\n    [74830.659500] PGD 0 P4D 0\n    [74830.660450] Oops: 0000 [#1] PREEMPT SMP PTI\n    ...\n    [74830.664953] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011\n    [74830.666569] RIP: 0010:rpfilter_mt+0x44/0x15e [ipt_rpfilter]\n    ...\n    [74830.689725] Call Trace:\n    [74830.690402]  \u003cIRQ\u003e\n    [74830.690953]  ? show_trace_log_lvl+0x1c4/0x2df\n    [74830.692020]  ? show_trace_log_lvl+0x1c4/0x2df\n    [74830.693095]  ? ipt_do_table+0x286/0x710 [ip_tables]\n    [74830.694275]  ? __die_body.cold+0x8/0xd\n    [74830.695205]  ? page_fault_oops+0xac/0x140\n    [74830.696244]  ? exc_page_fault+0x62/0x150\n    [74830.697225]  ? asm_exc_page_fault+0x22/0x30\n    [74830.698344]  ? rpfilter_mt+0x44/0x15e [ipt_rpfilter]\n    [74830.699540]  ipt_do_table+0x286/0x710 [ip_tables]\n    [74830.700758]  ? ip6_route_input+0x19d/0x240\n    [74830.701752]  nf_hook_slow+0x3f/0xb0\n    [74830.702678]  input_action_end_dx4+0x19b/0x1e0\n    [74830.703735]  ? input_action_end_t+0xe0/0xe0\n    [74830.704734]  seg6_local_input_core+0x2d/0x60\n    [74830.705782]  lwtunnel_input+0x5b/0xb0\n    [74830.706690]  __netif_receive_skb_one_core+0x63/0xa0\n    [74830.707825]  process_backlog+0x99/0x140\n    [74830.709538]  __napi_poll+0x2c/0x160\n    [74830.710673]  net_rx_action+0x296/0x350\n    [74830.711860]  __do_softirq+0xcb/0x2ac\n    [74830.713049]  do_softirq+0x63/0x90\n\ninput_action_end_dx4() passing a NULL indev to NF_HOOK(), and finally\ntrigger a NULL dereference in rpfilter_mt()-\u003erpfilter_is_loopback():\n\n    static bool\n    rpfilter_is_loopback(const struct sk_buff *skb,\n          \t       const struct net_device *in)\n    {\n            // in is NULL\n            return skb-\u003epkt_type == PACKET_LOOPBACK ||\n          \t in-\u003eflags \u0026 IFF_LOOPBACK;\n    }",
  "id": "GHSA-968h-6229-65gg",
  "modified": "2025-11-04T00:30:55Z",
  "published": "2024-07-12T15:31:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-40957"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/561475d53aa7e4511ee7cdba8728ded81cf1db1c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9a3bc8d16e0aacd65c31aaf23a2bced3288a7779"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/af90e3d73dc45778767b2fb6e7edd57ebe34380d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d62df86c172033679d744f07d89e93e367dd11f6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ec4d970b597ee5e17b0d8d73b7875197ce9a04d4"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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