CVE-2026-43380

Description

In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/q54sj108a2) fix stack overflow in debugfs read The q54sj108a2_debugfs_read function suffers from a stack buffer overflow due to incorrect arguments passed to bin2hex(). The function currently passes 'data' as the destination and 'data_char' as the source. Because bin2hex() converts each input byte into two hex characters, a 32-byte block read results in 64 bytes of output. Since 'data' is only 34 bytes (I2C_SMBUS_BLOCK_MAX + 2), this writes 30 bytes past the end of the buffer onto the stack. Additionally, the arguments were swapped: it was reading from the zero-initialized 'data_char' and writing to 'data', resulting in all-zero output regardless of the actual I2C read. Fix this by: 1. Expanding 'data_char' to 66 bytes to safely hold the hex output. 2. Correcting the bin2hex() argument order and using the actual read count. 3. Using a pointer to select the correct output buffer for the final simple_read_from_buffer call.

PUBLISHED Reserved 2026-05-01 | Published 2026-05-08 | Updated 2026-05-08 | Assigner Linux

Product status

References

git.kernel.org/...c/a0fc1b9c738fba231f190ab960c83202722efee5

git.kernel.org/...c/c59090c50f62a17129fc4c5407bc4071305a9e82

git.kernel.org/...c/52db5ef163c96f916d424e472fb17aadc35a9f7a

git.kernel.org/...c/b48a0f8d4541a4f6651dc9a64430ce9fdf5c120b

git.kernel.org/...c/73a7a345816946d276ad2c46c8bb771de67cfc46

git.kernel.org/...c/24a7b9daa103fa963b3fd37d8805b23e01621976

git.kernel.org/...c/25dd70a03b1f5f3aa71e1a5091ecd9cd2a13ee43

cve.org (CVE-2026-43380)

nvd.nist.gov (CVE-2026-43380)

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