---
id: CVE-2026-46027
title: 'net/smc: avoid early lgr access in smc_clc_wait_msg'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net/smc: avoid early lgr access in smc_clc_wait_msg

  A CLC decline can be received while the handshake is still in an early
  stage, before the connection has been associ…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 0cfdd8f92cac01afbb12e4500514036a2b78756b <
    257cdf0c5ced9c0fba8aba501d94b0a5fcef2086
  - >-
    Linux >= 0cfdd8f92cac01afbb12e4500514036a2b78756b <
    22546729b96fc873b23065dc49e3d73c45cfb874
  - >-
    Linux >= 0cfdd8f92cac01afbb12e4500514036a2b78756b <
    5eedbfd82c2884e0010fdfb3c9446a6ebcadb691
  - >-
    Linux >= 0cfdd8f92cac01afbb12e4500514036a2b78756b <
    f0858e1d5624bb120b198f2a8528f97a9b0ae069
  - >-
    Linux >= 0cfdd8f92cac01afbb12e4500514036a2b78756b <
    6180a296ca65b08a81914805cbc0f78da5f10a1f
  - >-
    Linux >= 0cfdd8f92cac01afbb12e4500514036a2b78756b <
    ea0b5d0fe96356dce38f98375a57c52a04e13712
  - >-
    Linux >= 0cfdd8f92cac01afbb12e4500514036a2b78756b <
    83bcf9228b0501694fb2589ed1d142855a2887f2
  - >-
    Linux >= 0cfdd8f92cac01afbb12e4500514036a2b78756b <
    5a8db80f721deee8e916c2cfdee78decda02ce4f
  - Linux 4.11
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T15:18:59.897964Z'
published: '2026-05-27'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:20:48.950Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-46027'
references:
  - url: 'https://git.kernel.org/stable/c/257cdf0c5ced9c0fba8aba501d94b0a5fcef2086'
  - url: 'https://git.kernel.org/stable/c/22546729b96fc873b23065dc49e3d73c45cfb874'
  - url: 'https://git.kernel.org/stable/c/5eedbfd82c2884e0010fdfb3c9446a6ebcadb691'
  - url: 'https://git.kernel.org/stable/c/f0858e1d5624bb120b198f2a8528f97a9b0ae069'
  - url: 'https://git.kernel.org/stable/c/6180a296ca65b08a81914805cbc0f78da5f10a1f'
  - url: 'https://git.kernel.org/stable/c/ea0b5d0fe96356dce38f98375a57c52a04e13712'
  - url: 'https://git.kernel.org/stable/c/83bcf9228b0501694fb2589ed1d142855a2887f2'
  - url: 'https://git.kernel.org/stable/c/5a8db80f721deee8e916c2cfdee78decda02ce4f'
tags:
  - cve.org
epss: 0.00716
epssPercentile: 0.52842
ingestedAt: '2026-10-16T17:24:46.703Z'
---

## Overview

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

net/smc: avoid early lgr access in smc_clc_wait_msg

A CLC decline can be received while the handshake is still in an early
stage, before the connection has been associated with a link group.

The decline handling in smc_clc_wait_msg() updates link-group level sync
state for first-contact declines, but that state only exists after link
group setup has completed. Guard the link-group update accordingly and
keep the per-socket peer diagnosis handling unchanged.

This preserves the existing sync_err handling for established link-group
contexts and avoids touching link-group state before it is available.

## Affected

- `Linux >= 0cfdd8f92cac01afbb12e4500514036a2b78756b < 257cdf0c5ced9c0fba8aba501d94b0a5fcef2086`
- `Linux >= 0cfdd8f92cac01afbb12e4500514036a2b78756b < 22546729b96fc873b23065dc49e3d73c45cfb874`
- `Linux >= 0cfdd8f92cac01afbb12e4500514036a2b78756b < 5eedbfd82c2884e0010fdfb3c9446a6ebcadb691`
- `Linux >= 0cfdd8f92cac01afbb12e4500514036a2b78756b < f0858e1d5624bb120b198f2a8528f97a9b0ae069`
- `Linux >= 0cfdd8f92cac01afbb12e4500514036a2b78756b < 6180a296ca65b08a81914805cbc0f78da5f10a1f`
- `Linux >= 0cfdd8f92cac01afbb12e4500514036a2b78756b < ea0b5d0fe96356dce38f98375a57c52a04e13712`
- `Linux >= 0cfdd8f92cac01afbb12e4500514036a2b78756b < 83bcf9228b0501694fb2589ed1d142855a2887f2`
- `Linux >= 0cfdd8f92cac01afbb12e4500514036a2b78756b < 5a8db80f721deee8e916c2cfdee78decda02ce4f`
- `Linux 4.11`

## Remediation

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