#VU124920 Use-after-free in Linux kernel - CVE-2026-23450
Published: April 6, 2026
Vulnerability identifier: #VU124920
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-23450
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a race condition leading to a NULL pointer dereference and use-after-free in smc_tcp_syn_recv_sock() when processing TCP connection requests concurrently with closing an SMC listen socket. A remote attacker can send network traffic that triggers the TCP handshake path to cause a denial of service.
The issue occurs because sk_user_data may become NULL or reference a freed smc_sock while the TCP receive path accesses it, resulting in a kernel panic.
Remediation
Install security update from vendor's repository.
External links
- https://git.kernel.org/stable/c/1e4f873879e075bbd4eb1c644d6933303ac5eba4
- https://git.kernel.org/stable/c/1fab5ece76fb42a761178dcd0ebcbf578377b0dd
- https://git.kernel.org/stable/c/6d5e4538364b9ceb1ac2941a4deb86650afb3538
- https://git.kernel.org/stable/c/cadf3da46c15523fba90d80c9955f536ee3b4023
- https://git.kernel.org/stable/c/f00fc26c8a06442b225a350fe000c0a11483e6a3
- https://git.kernel.org/stable/c/fd7579f0a2c84ba8a7d4f206201b50dc8ddf90c2