CVE-2023-53476 iw_cxgb4: Fix potential NULL dereference in c4iw_fill_res_cm_id_entry()

What is CVE-2023-53476?

CVE-2023-53476 is a medium-severity vulnerability in Linux kernel, published on 1 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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

iw_cxgb4: Fix potential NULL dereference in c4iw_fill_res_cm_id_entry()

This condition needs to match the previous "if (epcp->state == LISTEN) {" exactly to avoid a NULL dereference of either "listen_ep" or "ep". The problem is that "epcp" has been re-assigned so just testing "if (epcp->state == LISTEN) {" a second time is not sufficient.

Weakness: CWE-476

Which versions are affected by CVE-2023-53476?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-53476?

Apply the vendor's patch.

Is CVE-2023-53476 being exploited?

There is no known exploitation of CVE-2023-53476 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2023-53476, DEBIAN-CVE-2023-53476, GHSA-m68q-hxmp-jh9g, ROOT-OS-DEBIAN-11-CVE-2023-53476, UBUNTU-CVE-2023-53476.