CVE-2025-39806

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> HID: multitouch: fix slab out-of-bounds access in mt_report_fixup()<br /> <br /> A malicious HID device can trigger a slab out-of-bounds during<br /> mt_report_fixup() by passing in report descriptor smaller than<br /> 607 bytes. mt_report_fixup() attempts to patch byte offset 607<br /> of the descriptor with 0x25 by first checking if byte offset<br /> 607 is 0x15 however it lacks bounds checks to verify if the<br /> descriptor is big enough before conducting this check. Fix<br /> this bug by ensuring the descriptor size is at least 608<br /> bytes before accessing it.<br /> <br /> Below is the KASAN splat after the out of bounds access happens:<br /> <br /> [ 13.671954] ==================================================================<br /> [ 13.672667] BUG: KASAN: slab-out-of-bounds in mt_report_fixup+0x103/0x110<br /> [ 13.673297] Read of size 1 at addr ffff888103df39df by task kworker/0:1/10<br /> [ 13.673297]<br /> [ 13.673297] CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted 6.15.0-00005-gec5d573d83f4-dirty #3<br /> [ 13.673297] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/04<br /> [ 13.673297] Call Trace:<br /> [ 13.673297] <br /> [ 13.673297] dump_stack_lvl+0x5f/0x80<br /> [ 13.673297] print_report+0xd1/0x660<br /> [ 13.673297] kasan_report+0xe5/0x120<br /> [ 13.673297] __asan_report_load1_noabort+0x18/0x20<br /> [ 13.673297] mt_report_fixup+0x103/0x110<br /> [ 13.673297] hid_open_report+0x1ef/0x810<br /> [ 13.673297] mt_probe+0x422/0x960<br /> [ 13.673297] hid_device_probe+0x2e2/0x6f0<br /> [ 13.673297] really_probe+0x1c6/0x6b0<br /> [ 13.673297] __driver_probe_device+0x24f/0x310<br /> [ 13.673297] driver_probe_device+0x4e/0x220<br /> [ 13.673297] __device_attach_driver+0x169/0x320<br /> [ 13.673297] bus_for_each_drv+0x11d/0x1b0<br /> [ 13.673297] __device_attach+0x1b8/0x3e0<br /> [ 13.673297] device_initial_probe+0x12/0x20<br /> [ 13.673297] bus_probe_device+0x13d/0x180<br /> [ 13.673297] device_add+0xe3a/0x1670<br /> [ 13.673297] hid_add_device+0x31d/0xa40<br /> [...]