---
id: CVE-2022-49877
title: 'bpf, sockmap: Fix the sk->sk_forward_alloc warning of sk_stream_kill_queues'
summary: |-
  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 PI…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 244ce90c8d0bd10ebf957da02c6f3fcd5d920bdf <
    d975bec1eaeb52341acc9273db79ddb078220399
  - >-
    Linux >= 7b812a369e6416ab06d83cdd39d8e3f752781dd0 <
    cc21dc48a78cc9e5af9a4d039cd456446a6e73ff
  - >-
    Linux >= 168ff181f5b6e7fce684c98a30d35da1dbf8f82a <
    95adbd2ac8de82e43fd6b347e7e1b47f74dc1abb
  - >-
    Linux >= 84472b436e760ba439e1969a9e3c5ae7c86de39d <
    14e8bc3bf7bd6af64d7538a0684c8238d96cdfd7
  - >-
    Linux >= 84472b436e760ba439e1969a9e3c5ae7c86de39d <
    8ec95b94716a1e4d126edc3fb2bc426a717e2dba
  - Linux 87d532d41ef937e16f61b3d2094f3a2ac49be365
  - Linux abb4caa477a5450817d2aa1198edce66450aecf8
  - Linux >= 5.4.189 < 5.4.225
  - Linux >= 5.10.110 < 5.10.155
  - Linux >= 5.15.33 < 5.15.79
  - Linux >= 5.16.19 < 5.17
  - Linux >= 5.17.2 < 5.18
  - Linux 5.18
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T19:51:01.780618Z'
published: '2025-05-01'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:00:10.483Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-49877'
references:
  - url: 'https://git.kernel.org/stable/c/d975bec1eaeb52341acc9273db79ddb078220399'
  - url: 'https://git.kernel.org/stable/c/cc21dc48a78cc9e5af9a4d039cd456446a6e73ff'
  - url: 'https://git.kernel.org/stable/c/95adbd2ac8de82e43fd6b347e7e1b47f74dc1abb'
  - url: 'https://git.kernel.org/stable/c/14e8bc3bf7bd6af64d7538a0684c8238d96cdfd7'
  - url: 'https://git.kernel.org/stable/c/8ec95b94716a1e4d126edc3fb2bc426a717e2dba'
tags:
  - cve.org
epss: 0.00202
epssPercentile: 0.10139
ingestedAt: '2026-11-05T22:38:31.621Z'
---

## Overview

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;

## Affected

- `Linux >= 244ce90c8d0bd10ebf957da02c6f3fcd5d920bdf < d975bec1eaeb52341acc9273db79ddb078220399`
- `Linux >= 7b812a369e6416ab06d83cdd39d8e3f752781dd0 < cc21dc48a78cc9e5af9a4d039cd456446a6e73ff`
- `Linux >= 168ff181f5b6e7fce684c98a30d35da1dbf8f82a < 95adbd2ac8de82e43fd6b347e7e1b47f74dc1abb`
- `Linux >= 84472b436e760ba439e1969a9e3c5ae7c86de39d < 14e8bc3bf7bd6af64d7538a0684c8238d96cdfd7`
- `Linux >= 84472b436e760ba439e1969a9e3c5ae7c86de39d < 8ec95b94716a1e4d126edc3fb2bc426a717e2dba`
- `Linux 87d532d41ef937e16f61b3d2094f3a2ac49be365`
- `Linux abb4caa477a5450817d2aa1198edce66450aecf8`
- `Linux >= 5.4.189 < 5.4.225`
- `Linux >= 5.10.110 < 5.10.155`
- `Linux >= 5.15.33 < 5.15.79`
- `Linux >= 5.16.19 < 5.17`
- `Linux >= 5.17.2 < 5.18`
- `Linux 5.18`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.