CVE-2026-92480scsi: ufs: core: Validate string descriptors

Official description

In the Linux kernel, the following vulnerability has been resolved: scsi: ufs: core: Validate string descriptors The string descriptor length includes a two-byte header while the UTF-16 payload starts after it. utf16s_to_utf8s() expects a count of UTF-16 code units, not bytes. Passing the payload byte count can make it read beyond the descriptor buffer. Validate that the payload has an even byte count, pass a code-unit count to the converter, and allocate sufficient UTF-8 output space. The raw string buffer starts after the descriptor header but its size is bLength. Copying bLength bytes from that pointer can read beyond the response buffer. Allocate a zeroed bLength-sized buffer and copy only the UTF-16 payload. This preserves the raw buffer size consumed by the RPMB device-ID ABI while avoiding the overread.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/22c076f72ad67d89dab58d9c97a17c33e8130e82
• https://git.kernel.org/stable/c/566109f1ee4e389b4effab43b0ce1fdab302e9de
• https://git.kernel.org/stable/c/02dd1a65dff842d9360a38ebe243dc8f6adbbaf5
• https://git.kernel.org/stable/c/f3480c59f4ce97d831e9d06f5a2b9c20547ed1a4
• https://git.kernel.org/stable/c/66da25277256b6bf4c3fdbf3c9bfd43324c9cf25
• https://git.kernel.org/stable/c/d96e83d028d7d8762e424e49c671d49ac2ecf14f