Linux Kernel Vulnerability in UDF Processing Allows Bypassing CRC Validation

CVE-2026-53369

What is CVE-2026-53369?

A vulnerability exists in the Linux kernel's processing of Universal Disk Format (UDF) images. Specifically, the function responsible for reading tagged UDF data can skip the crucial CRC verification step if the calculated descriptor CRC length surpasses the block size limitations. This behavior allows a maliciously crafted UDF image to exploit the system, perpetuating the acceptance of the descriptor without proper validation. The system then relies solely on a basic 8-bit tag checksum for acceptance, which is easily forgeable. To enhance security, it is necessary to reject such oversized descriptors, reinforcing the integrity of descriptor acceptance during UDF data handling.

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