CVE-2026-53195 USB: serial: io_ti: fix heap overflow in build_i2c_fw_hdr()
A heap overflow in the Linux kernel's io_ti USB serial driver allows attackers to execute arbitrary code or escalate privileges via a malicious firmware image.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-53195?
CVE-2026-53195 is a high-severity memory corruption vulnerability in Linux kernel, published on 25 Jun 2026. 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:
USB: serial: io_ti: fix heap overflow in build_i2c_fw_hdr()
build_i2c_fw_hdr() allocates a fixed-size buffer of (16*1024 - 512) + sizeof(struct ti_i2c_firmware_rec) bytes, then copies le16_to_cpu(img_header->Length) bytes into it without validating that Length fits within the available space after the firmware record header.
img_header->Length is a __le16 from the firmware file and can be up to 65535. check_fw_sanity() validates the total firmware size but not img_header->Length specifically.
Fix by rejecting images where img_header->Length exceeds the available destination space.
Weakness: CWE-787
Which versions are affected by CVE-2026-53195?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53195?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-53195 being exploited?
There is no known exploitation of CVE-2026-53195 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-53195, DEBIAN-CVE-2026-53195, GHSA-397c-7vfx-vg4x, ROOT-OS-DEBIAN-11-CVE-2026-53195, ROOT-OS-DEBIAN-12-CVE-2026-53195, ROOT-OS-UBUNTU-2204-CVE-2026-53195 and 2 more.