CVE-2024-36905: tcp: defer shutdown(SEND_SHUTDOWN) for TCP_SYN_RECV sockets
First published: Thu May 30 2024(Updated: )
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
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <4.19.314 | 4.19.314 |
| redhat/kernel | <5.4.276 | 5.4.276 |
| redhat/kernel | <5.10.217 | 5.10.217 |
| redhat/kernel | <5.15.159 | 5.15.159 |
| redhat/kernel | <6.1.91 | 6.1.91 |
| redhat/kernel | <6.6.31 | 6.6.31 |
| redhat/kernel | <6.8.10 | 6.8.10 |
| redhat/kernel | <6.9 | 6.9 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/2552c9d9440f8e7a2ed0660911ff00f25b90a0a4
- https://git.kernel.org/stable/c/34e41a031fd7523bf1cd00a2adca2370aebea270
- https://git.kernel.org/stable/c/3fe4ef0568a48369b1891395d13ac593b1ba41b1
- https://git.kernel.org/stable/c/413c33b9f3bc36fdf719690a78824db9f88a9485
- https://git.kernel.org/stable/c/94062790aedb505bdda209b10bea47b294d6394f
- https://git.kernel.org/stable/c/cbf232ba11bc86a5281b4f00e1151349ef4d45cf
- https://git.kernel.org/stable/c/ed5e279b69e007ce6c0fe82a5a534c1b19783214
- https://git.kernel.org/stable/c/f47d0d32fa94e815fdd78b8b88684873e67939f4
- https://launchpad.net/bugs/cve/CVE-2024-36905
- https://www.openwall.com/lists/oss-security/2024/10/29/1
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-36905
- https://nvd.nist.gov/vuln/detail/CVE-2024-36905
- https://security-tracker.debian.org/tracker/CVE-2024-36905
- https://ubuntu.com/security/CVE-2024-36905
- http://www.openwall.com/lists/oss-security/2024/10/29/1
- http://www.openwall.com/lists/oss-security/2024/10/30/1
- http://www.openwall.com/lists/oss-security/2024/11/12/4
- http://www.openwall.com/lists/oss-security/2024/11/12/5
- http://www.openwall.com/lists/oss-security/2024/11/12/6
- https://lists.debian.org/debian-lts-announce/2024/06/msg00019.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
- https://security.netapp.com/advisory/ntap-20240905-0005/
- https://access.redhat.com/security/cve/cve-2024-36905
- https://alas.aws.amazon.com/cve/html/CVE-2024-36905.html
- https://github.com/cisagov/vulnrichment/issues/130
- https://www.openwall.com/lists/oss-security/2024/11/12/4
- https://git.kernel.org/linus/94062790aedb505bdda209b10bea47b294d6394f
- https://access.redhat.com/security/cve/CVE-2024-36905
- https://lore.kernel.org/linux-cve-announce/2024053036-CVE-2024-36905-5884@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2284540
- https://access.redhat.com/errata/RHSA-2024:5102
- https://access.redhat.com/errata/RHSA-2024:5101
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2284539#c4
- https://blockblast2.com
- https://capybara-game.com
- https://bugzilla.redhat.com/show_bug.cgi?id=2284539
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