---
id: CVE-2026-43411
title: 'tipc: fix divide-by-zero in tipc_sk_filter_connect()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  tipc: fix divide-by-zero in tipc_sk_filter_connect()

  A user can set conn_timeout to any value via
  setsockopt(TIPC_CONN_TIMEOUT), including values less than 4.  When a
  …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf <
    600feb0a66a98c6b7f6f02b5f3612e75f9b8540f
  - >-
    Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf <
    3bc9998041076ee05d3f312a22cee6b2ca35527f
  - >-
    Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf <
    579956f9f297eb1b6a5d24de313f3acccee1f9d5
  - >-
    Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf <
    a360d3815aae1f00dd71b7714a846482e85cc1f7
  - >-
    Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf <
    c2ebfbe63deb7bfd4dc2532bae62a7ed67713272
  - >-
    Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf <
    2754e7b3d64748643df867d1ea6fec522914b635
  - >-
    Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf <
    338c5edeb6ae3f12a4b84dff9d71f6f7f8c202c3
  - >-
    Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf <
    6c5a9baa15de240e747263aba435a0951da8d8d2
  - Linux 4.20
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T15:37:36.437553Z'
published: '2026-05-08'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T15:42:52.283Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43411'
references:
  - url: 'https://git.kernel.org/stable/c/600feb0a66a98c6b7f6f02b5f3612e75f9b8540f'
  - url: 'https://git.kernel.org/stable/c/3bc9998041076ee05d3f312a22cee6b2ca35527f'
  - url: 'https://git.kernel.org/stable/c/579956f9f297eb1b6a5d24de313f3acccee1f9d5'
  - url: 'https://git.kernel.org/stable/c/a360d3815aae1f00dd71b7714a846482e85cc1f7'
  - url: 'https://git.kernel.org/stable/c/c2ebfbe63deb7bfd4dc2532bae62a7ed67713272'
  - url: 'https://git.kernel.org/stable/c/2754e7b3d64748643df867d1ea6fec522914b635'
  - url: 'https://git.kernel.org/stable/c/338c5edeb6ae3f12a4b84dff9d71f6f7f8c202c3'
  - url: 'https://git.kernel.org/stable/c/6c5a9baa15de240e747263aba435a0951da8d8d2'
tags:
  - cve.org
epss: 0.00123
epssPercentile: 0.02051
ingestedAt: '2026-11-06T15:54:03.924Z'
---

## Overview

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

tipc: fix divide-by-zero in tipc_sk_filter_connect()

A user can set conn_timeout to any value via
setsockopt(TIPC_CONN_TIMEOUT), including values less than 4.  When a
SYN is rejected with TIPC_ERR_OVERLOAD and the retry path in
tipc_sk_filter_connect() executes:

    delay %= (tsk->conn_timeout / 4);

If conn_timeout is in the range [0, 3], the integer division yields 0,
and the modulo operation triggers a divide-by-zero exception, causing a
kernel oops/panic.

Fix this by clamping conn_timeout to a minimum of 4 at the point of use
in tipc_sk_filter_connect().

Oops: divide error: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 119 Comm: poc-F144 Not tainted 7.0.0-rc2+
RIP: 0010:tipc_sk_filter_rcv (net/tipc/socket.c:2236 net/tipc/socket.c:2362)
Call Trace:
 tipc_sk_backlog_rcv (include/linux/instrumented.h:82 include/linux/atomic/atomic-instrumented.h:32 include/net/sock.h:2357 net/tipc/socket.c:2406)
 __release_sock (include/net/sock.h:1185 net/core/sock.c:3213)
 release_sock (net/core/sock.c:3797)
 tipc_connect (net/tipc/socket.c:2570)
 __sys_connect (include/linux/file.h:62 include/linux/file.h:83 net/socket.c:2098)

## Affected

- `Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 600feb0a66a98c6b7f6f02b5f3612e75f9b8540f`
- `Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 3bc9998041076ee05d3f312a22cee6b2ca35527f`
- `Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 579956f9f297eb1b6a5d24de313f3acccee1f9d5`
- `Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < a360d3815aae1f00dd71b7714a846482e85cc1f7`
- `Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < c2ebfbe63deb7bfd4dc2532bae62a7ed67713272`
- `Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 2754e7b3d64748643df867d1ea6fec522914b635`
- `Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 338c5edeb6ae3f12a4b84dff9d71f6f7f8c202c3`
- `Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 6c5a9baa15de240e747263aba435a0951da8d8d2`
- `Linux 4.20`

## Remediation

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