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CVE-2025-37750 is a use-after-free vulnerability in the Linux kernel SMB client when performing synchronous decryption with multichannel enabled. Multiple per-channel cifsd threads can concurrently access an authenticated-encryption transform (AEAD TFM) shared with the primary channel. This unsafe reuse causes an invalid access to freed kernel memory during decryption. A reproduced failure on Linux 6.15.0-rc1 produced a KASAN slab-use-after-free report in gf128mul_4k_lle, reached through crypt_message, decrypt_raw_data, and smb3_receive_transform.
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A use-after-free vulnerability in the Linux kernel SMB/CIFS client during encrypted multichannel operation. Concurrent channel threads improperly share the primary channel's cryptographic transform during synchronous decryption. The issue was reproduced using an encrypted SMB 3.1.1 multichannel configuration. The reference assigns a CVSS v3 base score of 7.8 (High) and recommends updating Echo's linux package and related packages to version 6.12.25-1 or later.
A Linux kernel SMB client use-after-free vulnerability in multichannel decryption handling.
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