What’s Vulnerable › Vulnerabilities

CVE-2023-53551: usb: gadget: u_serial: Add null pointer check in gserial_resume

• 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: 2025-10-04 · updated 2026-06-17
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_serial: Add null pointer check in gserial_resume Consider a case where gserial_disconnect has already cleared gser->ioport. And if a wakeup interrupt triggers afterwards, gserial_resume gets called, which will lead to accessing of gser->ioport and thus causing null pointer dereference.Add a null pointer check to prevent this. Added a static spinlock to prevent gser->ioport from becoming null after the newly added check.

Affected products

• Linux kernel: from 5.8 before 5.10.171; from 5.11 before 5.15.97; from 5.16 before 6.1.15; from 6.2 before 6.2.2 — fixed in 5.10.171, 5.15.97, 6.1.15, 6.2.2

How to fix

Upgrade to a fixed version: Linux kernel 5.10.171, 5.15.97, 6.1.15, 6.2.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3b24c980dc07be4550a9d1450ed7057f882530e5
• https://git.kernel.org/stable/c/44e004f757a7ae13dfebaadbcfdb1a6f98c10377
• https://git.kernel.org/stable/c/5ec63fdbca604568890c577753c6f66c5b3ef0b5
• https://git.kernel.org/stable/c/c5360eec648bd506afa304ae4a71f82e13d41897
• https://git.kernel.org/stable/c/ec357cd3e8af614855d286dd378725cdc7264df6

Get alerted when CVE-2023-53551 or the next vulnerability affects your stack