---
id: CVE-2024-36905
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  tcp: defer shutdown(SEND_SHUTDOWN) for TCP_SYN_RECV sockets

  TCP_SYN_RECV state is really special, it is only used by
  cross-syn connections, mostly used by fuzzers.

  In…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  tcp: defer shutdown(SEND_SHUTDOWN) for TCP_SYN_RECV sockets

  TCP_SYN_RECV state is really special, it is only used by
  cross-syn connections, mostly used by fuzzers.

  In…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-369
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 2.6.12.1, < 4.19.314'
  - 'linux_kernel >= 4.20, < 5.4.276'
  - 'linux_kernel >= 5.5, < 5.10.217'
  - 'linux_kernel >= 5.11, < 5.15.159'
  - 'linux_kernel >= 5.16, < 6.1.91'
  - 'linux_kernel >= 6.2, < 6.6.31'
  - 'linux_kernel >= 6.7, < 6.8.10'
  - linux_kernel = 2.6.12
  - linux_kernel = 6.9
  - debian_linux = 10.0
patched:
  - linux_kernel 6.8.10
published: '2024-05-30'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:18:24.700'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-36905'
references:
  - url: 'https://git.kernel.org/stable/c/2552c9d9440f8e7a2ed0660911ff00f25b90a0a4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/34e41a031fd7523bf1cd00a2adca2370aebea270'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3fe4ef0568a48369b1891395d13ac593b1ba41b1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/413c33b9f3bc36fdf719690a78824db9f88a9485'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/94062790aedb505bdda209b10bea47b294d6394f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cbf232ba11bc86a5281b4f00e1151349ef4d45cf'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ed5e279b69e007ce6c0fe82a5a534c1b19783214'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f47d0d32fa94e815fdd78b8b88684873e67939f4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://www.openwall.com/lists/oss-security/2024/10/29/1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'http://www.openwall.com/lists/oss-security/2024/10/29/1'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.openwall.com/lists/oss-security/2024/10/30/1'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.openwall.com/lists/oss-security/2024/11/12/4'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.openwall.com/lists/oss-security/2024/11/12/5'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.openwall.com/lists/oss-security/2024/11/12/6'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/2552c9d9440f8e7a2ed0660911ff00f25b90a0a4'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/34e41a031fd7523bf1cd00a2adca2370aebea270'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/3fe4ef0568a48369b1891395d13ac593b1ba41b1'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/413c33b9f3bc36fdf719690a78824db9f88a9485'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/94062790aedb505bdda209b10bea47b294d6394f'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/cbf232ba11bc86a5281b4f00e1151349ef4d45cf'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/ed5e279b69e007ce6c0fe82a5a534c1b19783214'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/f47d0d32fa94e815fdd78b8b88684873e67939f4'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/06/msg00019.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20240905-0005/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/security/cve/cve-2024-36905'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://alas.aws.amazon.com/cve/html/CVE-2024-36905.html'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-265688.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-613116.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://github.com/cisagov/vulnrichment/issues/130'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://www.openwall.com/lists/oss-security/2024/11/12/4'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
epss: 0.00332
epssPercentile: 0.26223
ingestedAt: '2026-10-15T03:30:12.701Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2024-11-19T18:00:22.813648Z'
---

## Overview

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

tcp: defer shutdown(SEND_SHUTDOWN) for TCP_SYN_RECV sockets

TCP_SYN_RECV state is really special, it is only used by
cross-syn connections, mostly used by fuzzers.

In the following crash [1], syzbot managed to trigger a divide
by zero in tcp_rcv_space_adjust()

A socket makes the following state transitions,
without ever calling tcp_init_transfer(),
meaning tcp_init_buffer_space() is also not called.

         TCP_CLOSE
connect()
         TCP_SYN_SENT
         TCP_SYN_RECV
shutdown() -> tcp_shutdown(sk, SEND_SHUTDOWN)
         TCP_FIN_WAIT1

To fix this issue, change tcp_shutdown() to not
perform a TCP_SYN_RECV -> TCP_FIN_WAIT1 transition,
which makes no sense anyway.

When tcp_rcv_state_process() later changes socket state
from TCP_SYN_RECV to TCP_ESTABLISH, then look at
sk->sk_shutdown to finally enter TCP_FIN_WAIT1 state,
and send a FIN packet from a sane socket state.

This means tcp_send_fin() can now be called from BH
context, and must use GFP_ATOMIC allocations.

[1]
divide error: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 1 PID: 5084 Comm: syz-executor358 Not tainted 6.9.0-rc6-syzkaller-00022-g98369dccd2f8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
 RIP: 0010:tcp_rcv_space_adjust+0x2df/0x890 net/ipv4/tcp_input.c:767
Code: e3 04 4c 01 eb 48 8b 44 24 38 0f b6 04 10 84 c0 49 89 d5 0f 85 a5 03 00 00 41 8b 8e c8 09 00 00 89 e8 29 c8 48 0f af c3 31 d2 <48> f7 f1 48 8d 1c 43 49 8d 96 76 08 00 00 48 89 d0 48 c1 e8 03 48
RSP: 0018:ffffc900031ef3f0 EFLAGS: 00010246
RAX: 0c677a10441f8f42 RBX: 000000004fb95e7e RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000027d4b11f R08: ffffffff89e535a4 R09: 1ffffffff25e6ab7
R10: dffffc0000000000 R11: ffffffff8135e920 R12: ffff88802a9f8d30
R13: dffffc0000000000 R14: ffff88802a9f8d00 R15: 1ffff1100553f2da
FS:  00005555775c0380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1155bf2304 CR3: 000000002b9f2000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
  tcp_recvmsg_locked+0x106d/0x25a0 net/ipv4/tcp.c:2513
  tcp_recvmsg+0x25d/0x920 net/ipv4/tcp.c:2578
  inet6_recvmsg+0x16a/0x730 net/ipv6/af_inet6.c:680
  sock_recvmsg_nosec net/socket.c:1046 [inline]
  sock_recvmsg+0x109/0x280 net/socket.c:1068
  ____sys_recvmsg+0x1db/0x470 net/socket.c:2803
  ___sys_recvmsg net/socket.c:2845 [inline]
  do_recvmmsg+0x474/0xae0 net/socket.c:2939
  __sys_recvmmsg net/socket.c:3018 [inline]
  __do_sys_recvmmsg net/socket.c:3041 [inline]
  __se_sys_recvmmsg net/socket.c:3034 [inline]
  __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3034
  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
  do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faeb6363db9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcc1997168 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007faeb6363db9
RDX: 0000000000000001 RSI: 0000000020000bc0 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000001c
R10: 0000000000000122 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001

## Affected

- `linux_kernel >= 2.6.12.1, < 4.19.314`
- `linux_kernel >= 4.20, < 5.4.276`
- `linux_kernel >= 5.5, < 5.10.217`
- `linux_kernel >= 5.11, < 5.15.159`
- `linux_kernel >= 5.16, < 6.1.91`
- `linux_kernel >= 6.2, < 6.6.31`
- `linux_kernel >= 6.7, < 6.8.10`
- `linux_kernel = 2.6.12`
- `linux_kernel = 6.9`
- `debian_linux = 10.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.8.10`