CVE-2025-39818

In the Linux kernel, the following vulnerability has been resolved:

HID: intel-thc-hid: intel-thc: Fix incorrect pointer arithmetic in I2C regs save

Improper use of secondary pointer (&dev->i2c_subip_regs) caused

kernel crash and out-of-bounds error:

BUG: KASAN: slab-out-of-bounds in _regmap_bulk_read+0x449/0x510

Write of size 4 at addr ffff888136005dc0 by task kworker/u33:5/5107

CPU: 3 UID: 0 PID: 5107 Comm: kworker/u33:5 Not tainted 6.16.0+ #3 PREEMPT(voluntary)

Workqueue: async async_run_entry_fn

Call Trace:

<TASK>

dump_stack_lvl+0x76/0xa0

print_report+0xd1/0x660

? __pfx__raw_spin_lock_irqsave+0x10/0x10

? kasan_complete_mode_report_info+0x26/0x200

kasan_report+0xe1/0x120

? _regmap_bulk_read+0x449/0x510

? _regmap_bulk_read+0x449/0x510

__asan_report_store4_noabort+0x17/0x30

_regmap_bulk_read+0x449/0x510

? __pfx__regmap_bulk_read+0x10/0x10

regmap_bulk_read+0x270/0x3d0

pio_complete+0x1ee/0x2c0 [intel_thc]

? __pfx_pio_complete+0x10/0x10 [intel_thc]

? __pfx_pio_wait+0x10/0x10 [intel_thc]

? regmap_update_bits_base+0x13b/0x1f0

thc_i2c_subip_pio_read+0x117/0x270 [intel_thc]

thc_i2c_subip_regs_save+0xc2/0x140 [intel_thc]

? __pfx_thc_i2c_subip_regs_save+0x10/0x10 [intel_thc]

[...]

The buggy address belongs to the object at ffff888136005d00

which belongs to the cache kmalloc-rnd-12-192 of size 192

The buggy address is located 0 bytes to the right of

allocated 192-byte region [ffff888136005d00, ffff888136005dc0)

Replaced with direct array indexing (&dev->i2c_subip_regs[i]) to ensure

safe memory access.