CVE-2025-40168

smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match().

State: Published
Severity: 8.1 High
Published: Nov 12, 2025
Updated: Sep 2, 2026
Reserved: Apr 16, 2025

Read the record on cve.org

Description

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

smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match().

smc_clc_prfx_match() is called from smc_listen_work() and not under RCU nor RTNL.

Using sk_dst_get(sk)->dev could trigger UAF.

Let's use __sk_dst_get() and dst_dev_rcu().

Note that the returned value of smc_clc_prfx_match() is not used in the caller.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	a046d57da19f812216f393e7c535f5858f793ac3 to before 3f119c37aa293af41400cccb3d89fab8dcf774b0Affected a046d57da19f812216f393e7c535f5858f793ac3 to before 4f5f52a5842937f945582a93cb9daed9ea526feeAffected a046d57da19f812216f393e7c535f5858f793ac3 to before 326e5cf301d0bec0a672aa834d8254c4f9df6255Affected a046d57da19f812216f393e7c535f5858f793ac3 to before d26e80f7fb62d77757b67a1b94e4ac756bc9c658Affected a046d57da19f812216f393e7c535f5858f793ac3 to before 235f81045c008169cc4e1955b4a64e118eebe61bAffected
LinuxLinux	4.11Affected before 4.11Not affected 6.1.187 through 6.1.Not affected 6.6.156 through 6.6.Not affected 6.12.108 through 6.12.Not affected 6.17.3 through 6.17.Not affected 6.18 and laterNot affected

Product

Versions

LinuxLinux

a046d57da19f812216f393e7c535f5858f793ac3 to before 3f119c37aa293af41400cccb3d89fab8dcf774b0Affected
a046d57da19f812216f393e7c535f5858f793ac3 to before 4f5f52a5842937f945582a93cb9daed9ea526feeAffected
a046d57da19f812216f393e7c535f5858f793ac3 to before 326e5cf301d0bec0a672aa834d8254c4f9df6255Affected
a046d57da19f812216f393e7c535f5858f793ac3 to before d26e80f7fb62d77757b67a1b94e4ac756bc9c658Affected
a046d57da19f812216f393e7c535f5858f793ac3 to before 235f81045c008169cc4e1955b4a64e118eebe61bAffected

LinuxLinux

4.11Affected
before 4.11Not affected
6.1.187 through 6.1.*Not affected
6.6.156 through 6.6.*Not affected
6.12.108 through 6.12.*Not affected
6.17.3 through 6.17.*Not affected
6.18 and laterNot affected

References

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