CVE-2026-23450

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net/smc: fix NULL dereference and UAF in smc_tcp_syn_recv_sock() Syzkaller reported a panic in smc_tcp_syn_recv_sock() [1]. smc_tcp_syn_recv_sock() is called in the TCP receive path (softirq) via icsk_af_ops->syn_recv_sock on the clcsock (TCP listening socket). It reads sk_user_data to get the smc_sock pointer. However, when the SMC listen socket is being closed concurrently, smc_close_active() sets clcsock->sk_user_data to NULL under sk_callback_lock, and then the smc_sock itself can be freed via sock_put() in smc_release(...

Affected product and versions

Product

Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP

Affected versions

>= ebfee3e153f67c8b38eb94a7062ee94aa6f92708 < f315277856caeafcd996c2611afc085ca2d53275, >= 8270d9c21041470f58348248b9d9dcf3bf79592e < 1e4f873879e075bbd4eb1c644d6933303ac5eba4, >= 8270d9c21041470f58348248b9d9dcf3bf79592e < f00fc26c8a06442b225a350fe000c0a11483e6a3, >= 8270d9c21041470f58348248b9d9dcf3bf79592e < cadf3da46c15523fba90d80c9955f536ee3b4023, >= 8270d9c21041470f58348248b9d9dcf3bf79592e < fd7579f0a2c84ba8a7d4f206201b50dc8ddf90c2, >= 8270d9c21041470f58348248b9d9dcf3bf79592e < 1fab5ece76fb42a761178dcd0ebcbf578377b0dd, >= 8270d9c21041470f58348248b9d9dcf3bf79592e < 6d5e4538364b9ceb1ac2941a4deb86650afb3538, >= 5.15.174 < 5.15.203, >= 5.18, >= V3.1.6, >= V3.1.5, >= 5.18 < 6.1.167, >= 6.2 < 6.6.130, >= 6.7 < 6.12.78, >= 6.13 < 6.18.20, >= 6.19 < 6.19.10, 7.0

Fixed versions

5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.10

Technical data

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-416