CVE-2026-53195 Linux CVE debrief

Who should care

Linux kernel developers, Linux distribution maintainers, and users of Linux-based systems who use the USB: serial: io_ti module should be aware of this vulnerability. This vulnerability may allow attackers to execute arbitrary code or cause a denial of service.

Technical summary

The build_i2c_fw_hdr() function in the Linux kernel's USB: serial: io_ti module allocates a fixed-size buffer of (16*1024 - 512) + sizeof(struct ti_i2c_firmware_rec) bytes. It then copies le16_to_cpu(img_header->Length) bytes into this buffer without validating that Length fits within the available space after the firmware record header. This can lead to a heap overflow if img_header->Length is larger than the available space. The check_fw_sanity() function validates the total firmware size but not img_header->Length specifically. The vulnerability has been fixed by rejecting images where img_header->Length exceeds the available destination space.

Defensive priority

High priority should be given to patching this vulnerability, as it can potentially lead to arbitrary code execution or denial of service. Linux kernel developers and maintainers should apply the fix as soon as possible.

Recommended defensive actions

• Apply the official patch to update the Linux kernel's USB: serial: io_ti module.
• Review and update Linux distribution packages to ensure the fix is included.
• Perform a thorough inventory of Linux-based systems using the USB: serial: io_ti module and apply the patch or update packages accordingly.
• Monitor Linux kernel and distribution updates for future security patches.
• Consider implementing compensating controls, such as intrusion detection and prevention systems, to detect and prevent exploitation attempts.

Evidence notes

The CVE-2026-53195 vulnerability was discovered in the Linux kernel's USB: serial: io_ti module. The vulnerability is caused by a heap overflow in the build_i2c_fw_hdr() function. The fix for this vulnerability has been applied to the Linux kernel. The CVE record and NVD detail provide additional information about this vulnerability.

Official resources