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CVE-2024-47685

Status: ModifiedCritical (9.1)—

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

netfilter: nf_reject_ipv6: fix nf_reject_ip6_tcphdr_put()

syzbot reported that nf_reject_ip6_tcphdr_put() was possibly sending garbage on the four reserved tcp bits (th->res1)

Use skb_put_zero() to clear the whole TCP header, as done in nf_reject_ip_tcphdr_put()

Technical details traces, logs and code from the original report
BUG: KMSAN: uninit-value in nf_reject_ip6_tcphdr_put+0x688/0x6c0 net/ipv6/netfilter/nf_reject_ipv6.c:255
  nf_reject_ip6_tcphdr_put+0x688/0x6c0 net/ipv6/netfilter/nf_reject_ipv6.c:255
  nf_send_reset6+0xd84/0x15b0 net/ipv6/netfilter/nf_reject_ipv6.c:344
  nft_reject_inet_eval+0x3c1/0x880 net/netfilter/nft_reject_inet.c:48
  expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]
  nft_do_chain+0x438/0x22a0 net/netfilter/nf_tables_core.c:288
  nft_do_chain_inet+0x41a/0x4f0 net/netfilter/nft_chain_filter.c:161
  nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
  nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626
  nf_hook include/linux/netfilter.h:269 [inline]
  NF_HOOK include/linux/netfilter.h:312 [inline]
  ipv6_rcv+0x29b/0x390 net/ipv6/ip6_input.c:310
  __netif_receive_skb_one_core net/core/dev.c:5661 [inline]
  __netif_receive_skb+0x1da/0xa00 net/core/dev.c:5775
  process_backlog+0x4ad/0xa50 net/core/dev.c:6108
  __napi_poll+0xe7/0x980 net/core/dev.c:6772
  napi_poll net/core/dev.c:6841 [inline]
  net_rx_action+0xa5a/0x19b0 net/core/dev.c:6963
  handle_softirqs+0x1ce/0x800 kernel/softirq.c:554
  __do_softirq+0x14/0x1a kernel/softirq.c:588
  do_softirq+0x9a/0x100 kernel/softirq.c:455
  __local_bh_enable_ip+0x9f/0xb0 kernel/softirq.c:382
  local_bh_enable include/linux/bottom_half.h:33 [inline]
  rcu_read_unlock_bh include/linux/rcupdate.h:908 [inline]
  __dev_queue_xmit+0x2692/0x5610 net/core/dev.c:4450
  dev_queue_xmit include/linux/netdevice.h:3105 [inline]
  neigh_resolve_output+0x9ca/0xae0 net/core/neighbour.c:1565
  neigh_output include/net/neighbour.h:542 [inline]
  ip6_finish_output2+0x2347/0x2ba0 net/ipv6/ip6_output.c:141
  __ip6_finish_output net/ipv6/ip6_output.c:215 [inline]
  ip6_finish_output+0xbb8/0x14b0 net/ipv6/ip6_output.c:226
  NF_HOOK_COND include/linux/netfilter.h:303 [inline]
  ip6_output+0x356/0x620 net/ipv6/ip6_output.c:247
  dst_output include/net/dst.h:450 [inline]
  NF_HOOK include/linux/netfilter.h:314 [inline]
  ip6_xmit+0x1ba6/0x25d0 net/ipv6/ip6_output.c:366
  inet6_csk_xmit+0x442/0x530 net/ipv6/inet6_connection_sock.c:135
  __tcp_transmit_skb+0x3b07/0x4880 net/ipv4/tcp_output.c:1466
  tcp_transmit_skb net/ipv4/tcp_output.c:1484 [inline]
  tcp_connect+0x35b6/0x7130 net/ipv4/tcp_output.c:4143
  tcp_v6_connect+0x1bcc/0x1e40 net/ipv6/tcp_ipv6.c:333
  __inet_stream_connect+0x2ef/0x1730 net/ipv4/af_inet.c:679
  inet_stream_connect+0x6a/0xd0 net/ipv4/af_inet.c:750
  __sys_connect_file net/socket.c:2061 [inline]
  __sys_connect+0x606/0x690 net/socket.c:2078
  __do_sys_connect net/socket.c:2088 [inline]
  __se_sys_connect net/socket.c:2085 [inline]
  __x64_sys_connect+0x91/0xe0 net/socket.c:2085
  x64_sys_call+0x27a5/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:43
  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
  do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
  nf_reject_ip6_tcphdr_put+0x60c/0x6c0 net/ipv6/netfilter/nf_reject_ipv6.c:249
  nf_send_reset6+0xd84/0x15b0 net/ipv6/netfilter/nf_reject_ipv6.c:344
  nft_reject_inet_eval+0x3c1/0x880 net/netfilter/nft_reject_inet.c:48
  expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]
  nft_do_chain+0x438/0x22a0 net/netfilter/nf_tables_core.c:288
  nft_do_chain_inet+0x41a/0x4f0 net/netfilter/nft_chain_filter.c:161
  nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
  nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626
  nf_hook include/linux/netfilter.h:269 [inline]
  NF_HOOK include/linux/netfilter.h:312 [inline]
  ipv6_rcv+0x29b/0x390 net/ipv6/ip6_input.c:310
  __netif_receive_skb_one_core
---truncated---

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

Vulnerabilidad en netfilter IPv6 (AV:N/AC:L/PR:N) que causa lectura de memoria no inicializada (CWE-908) y denial of service en procesamiento de paquetes TCP/IPv6 remotos sin autenticación.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Affected technologies (2)

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2024-47685",
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          "programFiles": [
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    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_reject_ipv6: fix nf_reject_ip6_tcphdr_put()\n\nsyzbot reported that nf_reject_ip6_tcphdr_put() was possibly sending\ngarbage on the four reserved tcp bits (th->res1)\n\nUse skb_put_zero() to clear the whole TCP header,\nas done in nf_reject_ip_tcphdr_put()\n\nBUG: KMSAN: uninit-value in nf_reject_ip6_tcphdr_put+0x688/0x6c0 net/ipv6/netfilter/nf_reject_ipv6.c:255\n  nf_reject_ip6_tcphdr_put+0x688/0x6c0 net/ipv6/netfilter/nf_reject_ipv6.c:255\n  nf_send_reset6+0xd84/0x15b0 net/ipv6/netfilter/nf_reject_ipv6.c:344\n  nft_reject_inet_eval+0x3c1/0x880 net/netfilter/nft_reject_inet.c:48\n  expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]\n  nft_do_chain+0x438/0x22a0 net/netfilter/nf_tables_core.c:288\n  nft_do_chain_inet+0x41a/0x4f0 net/netfilter/nft_chain_filter.c:161\n  nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]\n  nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626\n  nf_hook include/linux/netfilter.h:269 [inline]\n  NF_HOOK include/linux/netfilter.h:312 [inline]\n  ipv6_rcv+0x29b/0x390 net/ipv6/ip6_input.c:310\n  __netif_receive_skb_one_core net/core/dev.c:5661 [inline]\n  __netif_receive_skb+0x1da/0xa00 net/core/dev.c:5775\n  process_backlog+0x4ad/0xa50 net/core/dev.c:6108\n  __napi_poll+0xe7/0x980 net/core/dev.c:6772\n  napi_poll net/core/dev.c:6841 [inline]\n  net_rx_action+0xa5a/0x19b0 net/core/dev.c:6963\n  handle_softirqs+0x1ce/0x800 kernel/softirq.c:554\n  __do_softirq+0x14/0x1a kernel/softirq.c:588\n  do_softirq+0x9a/0x100 kernel/softirq.c:455\n  __local_bh_enable_ip+0x9f/0xb0 kernel/softirq.c:382\n  local_bh_enable include/linux/bottom_half.h:33 [inline]\n  rcu_read_unlock_bh include/linux/rcupdate.h:908 [inline]\n  __dev_queue_xmit+0x2692/0x5610 net/core/dev.c:4450\n  dev_queue_xmit include/linux/netdevice.h:3105 [inline]\n  neigh_resolve_output+0x9ca/0xae0 net/core/neighbour.c:1565\n  neigh_output include/net/neighbour.h:542 [inline]\n  ip6_finish_output2+0x2347/0x2ba0 net/ipv6/ip6_output.c:141\n  __ip6_finish_output net/ipv6/ip6_output.c:215 [inline]\n  ip6_finish_output+0xbb8/0x14b0 net/ipv6/ip6_output.c:226\n  NF_HOOK_COND include/linux/netfilter.h:303 [inline]\n  ip6_output+0x356/0x620 net/ipv6/ip6_output.c:247\n  dst_output include/net/dst.h:450 [inline]\n  NF_HOOK include/linux/netfilter.h:314 [inline]\n  ip6_xmit+0x1ba6/0x25d0 net/ipv6/ip6_output.c:366\n  inet6_csk_xmit+0x442/0x530 net/ipv6/inet6_connection_sock.c:135\n  __tcp_transmit_skb+0x3b07/0x4880 net/ipv4/tcp_output.c:1466\n  tcp_transmit_skb net/ipv4/tcp_output.c:1484 [inline]\n  tcp_connect+0x35b6/0x7130 net/ipv4/tcp_output.c:4143\n  tcp_v6_connect+0x1bcc/0x1e40 net/ipv6/tcp_ipv6.c:333\n  __inet_stream_connect+0x2ef/0x1730 net/ipv4/af_inet.c:679\n  inet_stream_connect+0x6a/0xd0 net/ipv4/af_inet.c:750\n  __sys_connect_file net/socket.c:2061 [inline]\n  __sys_connect+0x606/0x690 net/socket.c:2078\n  __do_sys_connect net/socket.c:2088 [inline]\n  __se_sys_connect net/socket.c:2085 [inline]\n  __x64_sys_connect+0x91/0xe0 net/socket.c:2085\n  x64_sys_call+0x27a5/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:43\n  do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n  do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nUninit was stored to memory at:\n  nf_reject_ip6_tcphdr_put+0x60c/0x6c0 net/ipv6/netfilter/nf_reject_ipv6.c:249\n  nf_send_reset6+0xd84/0x15b0 net/ipv6/netfilter/nf_reject_ipv6.c:344\n  nft_reject_inet_eval+0x3c1/0x880 net/netfilter/nft_reject_inet.c:48\n  expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]\n  nft_do_chain+0x438/0x22a0 net/netfilter/nf_tables_core.c:288\n  nft_do_chain_inet+0x41a/0x4f0 net/netfilter/nft_chain_filter.c:161\n  nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]\n  nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626\n  nf_hook include/linux/netfilter.h:269 [inline]\n  NF_HOOK include/linux/netfilter.h:312 [inline]\n  ipv6_rcv+0x29b/0x390 net/ipv6/ip6_input.c:310\n  __netif_receive_skb_one_core\n---truncated---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: nf_reject_ipv6: corrección de nf_reject_ip6_tcphdr_put() syzbot informó que nf_reject_ip6_tcphdr_put() posiblemente estaba enviando basura en los cuatro bits tcp reservados (th->res1) Utilice skb_put_zero() para borrar todo el encabezado TCP, como se hace en nf_reject_ip_tcphdr_put() ERROR: KMSAN: valor no inicializado en nf_reject_ip6_tcphdr_put+0x688/0x6c0 net/ipv6/netfilter/nf_reject_ipv6.c:255 nf_reject_ip6_tcphdr_put+0x688/0x6c0 net/ipv6/netfilter/nf_reject_ipv6.c:255 nf_send_reset6+0xd84/0x15b0 net/ipv6/netfilter/nf_reject_ipv6.c:344 nft_reject_inet_eval+0x3c1/0x880 net/netfilter/nft_reject_inet.c:48 evaluación_operaciones_llamada_expr net/netfilter/nf_tables_core.c:240 [en línea] nft_do_chain+0x438/0x22a0 net/netfilter/nf_tables_core.c:288 nft_do_chain_inet+0x41a/0x4f0 net/netfilter/nft_chain_filter.c:161 nf_hook_entry_hookfn incluye/linux/netfilter.h:154 [en línea] nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626 nf_hook incluye/linux/netfilter.h:269 [en línea] NF_HOOK incluye/linux/netfilter.h:312 [en línea] ipv6_rcv+0x29b/0x390 net/ipv6/ip6_input.c:310 __netif_receive_skb_one_core net/core/dev.c:5661 [en línea] __netif_receive_skb+0x1da/0xa00 net/core/dev.c:5775 process_backlog+0x4ad/0xa50 net/core/dev.c:6108 __napi_poll+0xe7/0x980 net/core/dev.c:6772 napi_poll net/core/dev.c:6841 [en línea] net_rx_action+0xa5a/0x19b0 net/core/dev.c:6963 handle_softirqs+0x1ce/0x800 kernel/softirq.c:554 __do_softirq+0x14/0x1a kernel/softirq.c:588 do_softirq+0x9a/0x100 kernel/softirq.c:455 __local_bh_enable_ip+0x9f/0xb0 kernel/softirq.c:382 local_bh_enable include/linux/bottom_half.h:33 [en línea] rcu_read_unlock_bh incluir/linux/rcupdate.h:908 [en línea] __dev_queue_xmit+0x2692/0x5610 net/core/dev.c:4450 dev_queue_xmit incluir/linux/netdevice.h:3105 [en línea] neigh_resolve_output+0x9ca/0xae0 net/core/neighbour.c:1565 neigh_output incluir/net/neighbour.h:542 [en línea] ip6_finish_output2+0x2347/0x2ba0 net/ipv6/ip6_output.c:141 __ip6_finish_output net/ipv6/ip6_output.c:215 [en línea] ip6_finish_output+0xbb8/0x14b0 net/ipv6/ip6_output.c:226 NF_HOOK_COND incluye/linux/netfilter.h:303 [en línea] ip6_output+0x356/0x620 net/ipv6/ip6_output.c:247 dst_output incluye/net/dst.h:450 [en línea] NF_HOOK incluye/linux/netfilter.h:314 [en línea] ip6_xmit+0x1ba6/0x25d0 net/ipv6/ip6_output.c:366 inet6_csk_xmit+0x442/0x530 net/ipv6/inet6_connection_sock.c:135 __tcp_transmit_skb+0x3b07/0x4880 net/ipv4/tcp_output.c:1466 tcp_transmit_skb net/ipv4/tcp_output.c:1484 [en línea] tcp_connect+0x35b6/0x7130 net/ipv4/tcp_output.c:4143 tcp_v6_connect+0x1bcc/0x1e40 net/ipv6/tcp_ipv6.c:333 __inet_stream_connect+0x2ef/0x1730 net/ipv4/af_inet.c:679 inet_stream_connect+0x6a/0xd0 net/ipv4/af_inet.c:750 __sys_connect_file net/socket.c:2061 [en línea] __sys_connect+0x606/0x690 net/socket.c:2078 __do_sys_connect net/socket.c:2088 [en línea] __se_sys_connect net/socket.c:2085 [en línea] __x64_sys_connect+0x91/0xe0 net/socket.c:2085 x64_sys_call+0x27a5/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:43 do_syscall_x64 arch/x86/entry/common.c:52 [en línea] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit se almacenó en la memoria en: nf_reject_ip6_tcphdr_put+0x60c/0x6c0 net/ipv6/netfilter/nf_reject_ipv6.c:249 nf_send_reset6+0xd84/0x15b0 net/ipv6/netfilter/nf_reject_ipv6.c:344 nft_reject_inet_eval+0x3c1/0x880 net/netfilter/nft_reject_inet.c:48 evaluación_operaciones_llamada_expr net/netfilter/nf_tables_core.c:240 [en línea] nft_do_chain+0x438/0x22a0 net/netfilter/nf_tables_core.c:288 nft_do_chain_inet+0x41a/0x4f0 net/netfilter/nft_chain_filter.c:161 nf_hook_entry_hookfn incluye/linux/netfilter.h:154 [en línea] nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626 nf_hook incluye/linux/netfilter.h:269 [en línea] NF_HOOK incluye/linux/netfilter.h:312 [en línea] ipv6_rcv+0x29b/0x390 net/ipv6/ip6_input.c:310 __netif_receive_skb_one_core ---truncado---"
    }
  ],
  "lastModified": "2026-06-17T07:57:32.197",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4CF15846-AEEF-4FBF-BED3-18AFD682270F",
              "versionEndExcluding": "4.19.323",
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            },
            {
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              "matchCriteriaId": "B5A89369-320F-47FC-8695-56F61F87E4C0",
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            {
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              "vulnerable": true,
              "matchCriteriaId": "795A3EE6-0CAB-4409-A903-151C94ACECC0",
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            {
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              "matchCriteriaId": "4D51C05D-455B-4D8D-89E7-A58E140B864C",
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            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "D01BD22E-ACD1-4618-9D01-6116570BE1EE",
              "versionEndExcluding": "6.1.113",
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              "matchCriteriaId": "D448821D-C085-4CAF-88FA-2DDE7BE21976",
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              "vulnerable": true,
              "matchCriteriaId": "CE94BB8D-B0AB-4563-9ED7-A12122B56EBE",
              "versionEndExcluding": "6.10.13",
              "versionStartIncluding": "6.7"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "AB755D26-97F4-43B6-8604-CD076811E181",
              "versionEndExcluding": "6.11.2",
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            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}