What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-01 · updated 2026-06-17
• Weakness: CWE-476

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.

Affected products

• Linux kernel: from 4.18 before 5.15.99; from 5.16 before 6.1.16; from 6.2 before 6.2.3 — fixed in 5.15.99, 6.1.16, 6.2.3

How to fix

Upgrade to a fixed version: Linux kernel 5.15.99, 6.1.16, 6.2.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/24278dc380aab6a1aef0a75317f57ad4c2453cf6
• https://git.kernel.org/stable/c/4ca446b127c568b59cb8d9748b6f70499624bb18
• https://git.kernel.org/stable/c/76e0396313c79ecd0df44ee3c18745cfac52b3e6
• https://git.kernel.org/stable/c/dd55240e4364d64befcc575b0d33091881524f42

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