CVE-2026-46027

net/smc: avoid early lgr access in smc_clc_wait_msg

State: Published
Severity: 7.5 High
Published: May 27, 2026
Updated: Oct 19, 2026
Reserved: May 13, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	Linux

Weaknesses

CWE-617 Reachable Assertion

Affected Products

Product	Versions
LinuxLinux	0cfdd8f92cac01afbb12e4500514036a2b78756b to before 257cdf0c5ced9c0fba8aba501d94b0a5fcef2086Affected 0cfdd8f92cac01afbb12e4500514036a2b78756b to before 22546729b96fc873b23065dc49e3d73c45cfb874Affected 0cfdd8f92cac01afbb12e4500514036a2b78756b to before 5eedbfd82c2884e0010fdfb3c9446a6ebcadb691Affected 0cfdd8f92cac01afbb12e4500514036a2b78756b to before f0858e1d5624bb120b198f2a8528f97a9b0ae069Affected 0cfdd8f92cac01afbb12e4500514036a2b78756b to before 6180a296ca65b08a81914805cbc0f78da5f10a1fAffected 0cfdd8f92cac01afbb12e4500514036a2b78756b to before ea0b5d0fe96356dce38f98375a57c52a04e13712Affected 0cfdd8f92cac01afbb12e4500514036a2b78756b to before 83bcf9228b0501694fb2589ed1d142855a2887f2Affected 0cfdd8f92cac01afbb12e4500514036a2b78756b to before 5a8db80f721deee8e916c2cfdee78decda02ce4fAffected
LinuxLinux	4.11Affected before 4.11Not affected 5.10.258 through 5.10.Not affected 5.15.209 through 5.15.Not affected 6.1.175 through 6.1.Not affected 6.6.140 through 6.6.Not affected 6.12.86 through 6.12.Not affected 6.18.27 through 6.18.Not affected 7.0.4 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

0cfdd8f92cac01afbb12e4500514036a2b78756b to before 257cdf0c5ced9c0fba8aba501d94b0a5fcef2086Affected
0cfdd8f92cac01afbb12e4500514036a2b78756b to before 22546729b96fc873b23065dc49e3d73c45cfb874Affected
0cfdd8f92cac01afbb12e4500514036a2b78756b to before 5eedbfd82c2884e0010fdfb3c9446a6ebcadb691Affected
0cfdd8f92cac01afbb12e4500514036a2b78756b to before f0858e1d5624bb120b198f2a8528f97a9b0ae069Affected
0cfdd8f92cac01afbb12e4500514036a2b78756b to before 6180a296ca65b08a81914805cbc0f78da5f10a1fAffected
0cfdd8f92cac01afbb12e4500514036a2b78756b to before ea0b5d0fe96356dce38f98375a57c52a04e13712Affected
0cfdd8f92cac01afbb12e4500514036a2b78756b to before 83bcf9228b0501694fb2589ed1d142855a2887f2Affected
0cfdd8f92cac01afbb12e4500514036a2b78756b to before 5a8db80f721deee8e916c2cfdee78decda02ce4fAffected

LinuxLinux

4.11Affected
before 4.11Not affected
5.10.258 through 5.10.*Not affected
5.15.209 through 5.15.*Not affected
6.1.175 through 6.1.*Not affected
6.6.140 through 6.6.*Not affected
6.12.86 through 6.12.*Not affected
6.18.27 through 6.18.*Not affected
7.0.4 through 7.0.*Not affected
7.1 and laterNot affected

References

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