# CVE-2026-53292: net: phonet: do not BUG_ON() in pn_socket_autobind() on failed bind

CVE-2026-53292 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-53292, released June 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-53292
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 26, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53292

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-53292](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53292.md) | Jun 27, 2026 |
| Linux | linux Debian 14 | 7.0.10-1 | [DEBIAN-CVE-2026-53292](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53292.md) | Jun 27, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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