---
id: CVE-2026-53292
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: phonet: do not BUG_ON() in pn_socket_autobind() on failed bind

  syzbot reported a kernel BUG triggered from pn_socket_sendmsg() via
  pn_socket_autobind():

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

  net: phonet: do not BUG_ON() in pn_socket_autobind() on failed bind

  syzbot reported a kernel BUG triggered from pn_socket_sendmsg() via
  pn_socket_autobind():

    kernel…
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-617
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 2.6.28, < 7.0.10'
  - linux_kernel = 7.1
patched:
  - linux_kernel 7.0.10
published: '2026-06-26'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T11:17:37.113'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53292'
references:
  - url: 'https://git.kernel.org/stable/c/5459933a799aaf642cbeb35fdf7e78c59bf2fb9b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5b0c911bcdbd982f7748d11c0b39ec5808eae2de'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6db58ee730bf434d1afca91b91826e26688856ed'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00143
epssPercentile: 0.03211
ingestedAt: '2026-10-15T11:00:41.700Z'
---

## Overview

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

net: phonet: do not BUG_ON() in pn_socket_autobind() on failed bind

syzbot reported a kernel BUG triggered from pn_socket_sendmsg() via
pn_socket_autobind():

  kernel BUG at net/phonet/socket.c:213!
  RIP: 0010:pn_socket_autobind net/phonet/socket.c:213 [inline]
  RIP: 0010:pn_socket_sendmsg+0x240/0x250 net/phonet/socket.c:421
  Call Trace:
   sock_sendmsg_nosec+0x112/0x150 net/socket.c:797
   __sock_sendmsg net/socket.c:812 [inline]
   __sys_sendto+0x402/0x590 net/socket.c:2280
   ...

pn_socket_autobind() calls pn_socket_bind() with port 0 and, on
-EINVAL, assumes the socket was already bound and asserts that the
port is non-zero:

  err = pn_socket_bind(sock, ..., sizeof(struct sockaddr_pn));
  if (err != -EINVAL)
          return err;
  BUG_ON(!pn_port(pn_sk(sock->sk)->sobject));
  return 0; /* socket was already bound */

However pn_socket_bind() also returns -EINVAL when sk->sk_state is not
TCP_CLOSE, even when the socket has never been bound and pn_port() is
still 0.  In that case the BUG_ON() fires and panics the kernel from a
user-triggerable path.

Treat the "bind returned -EINVAL but pn_port() is still 0" case as a
regular error and propagate -EINVAL to the caller instead of crashing.
Existing callers already translate a non-zero return from
pn_socket_autobind() into -ENOBUFS/-EAGAIN, so returning -EINVAL here
only changes behaviour from panic to a normal errno.

## Affected

- `linux_kernel >= 2.6.28, < 7.0.10`
- `linux_kernel = 7.1`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.0.10`