Description
In the Linux kernel, the following vulnerability has been resolved: HID: asus: fix UAF via HID_CLAIMED_INPUT validation After hid_hw_start() is called hidinput_connect() will eventually be called to set up the device with the input layer since the HID_CONNECT_DEFAULT connect mask is used. During hidinput_connect() all input and output reports are processed and corresponding hid_inputs are allocated and configured via hidinput_configure_usages(). This process involves slot tagging report fields and configuring usages by setting relevant bits in the capability bitmaps. However it is possible that the capability bitmaps are not set at all leading to the subsequent hidinput_has_been_populated() check to fail leading to the freeing of the hid_input and the underlying input device. This becomes problematic because a malicious HID device like a ASUS ROG N-Key keyboard can trigger the above scenario via a specially crafted descriptor which then leads to a user-after-free when the name of the freed input device is written to later on after hid_hw_start(). Below, report 93 intentionally utilises the HID_UP_UNDEFINED Usage Page which is skipped during usage configuration, leading to the frees. 0x05, 0x0D, // Usage Page (Digitizer) 0x09, 0x05, // Usage (Touch Pad) 0xA1, 0x01, // Collection (Application) 0x85, 0x0D, // Report ID (13) 0x06, 0x00, 0xFF, // Usage Page (Vendor Defined 0xFF00) 0x09, 0xC5, // Usage (0xC5) 0x15, 0x00, // Logical Minimum (0) 0x26, 0xFF, 0x00, // Logical Maximum (255) 0x75, 0x08, // Report Size (8) 0x95, 0x04, // Report Count (4) 0xB1, 0x02, // Feature (Data,Var,Abs) 0x85, 0x5D, // Report ID (93) 0x06, 0x00, 0x00, // Usage Page (Undefined) 0x09, 0x01, // Usage (0x01) 0x15, 0x00, // Logical Minimum (0) 0x26, 0xFF, 0x00, // Logical Maximum (255) 0x75, 0x08, // Report Size (8) 0x95, 0x1B, // Report Count (27) 0x81, 0x02, // Input (Data,Var,Abs) 0xC0, // End Collection Below is the KASAN splat after triggering the UAF: [ 21.672709] ================================================================== [ 21.673700] BUG: KASAN: slab-use-after-free in asus_probe+0xeeb/0xf80 [ 21.673700] Write of size 8 at addr ffff88810a0ac000 by task kworker/1:2/54 [ 21.673700] [ 21.673700] CPU: 1 UID: 0 PID: 54 Comm: kworker/1:2 Not tainted 6.16.0-rc4-g9773391cf4dd-dirty #36 PREEMPT(voluntary) [ 21.673700] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 21.673700] Call Trace: [ 21.673700] <TASK> [ 21.673700] dump_stack_lvl+0x5f/0x80 [ 21.673700] print_report+0xd1/0x660 [ 21.673700] kasan_report+0xe5/0x120 [ 21.673700] __asan_report_store8_noabort+0x1b/0x30 [ 21.673700] asus_probe+0xeeb/0xf80 [ 21.673700] hid_device_probe+0x2ee/0x700 [ 21.673700] really_probe+0x1c6/0x6b0 [ 21.673700] __driver_probe_device+0x24f/0x310 [ 21.673700] driver_probe_device+0x4e/0x220 [...] [ 21.673700] [ 21.673700] Allocated by task 54: [ 21.673700] kasan_save_stack+0x3d/0x60 [ 21.673700] kasan_save_track+0x18/0x40 [ 21.673700] kasan_save_alloc_info+0x3b/0x50 [ 21.673700] __kasan_kmalloc+0x9c/0xa0 [ 21.673700] __kmalloc_cache_noprof+0x139/0x340 [ 21.673700] input_allocate_device+0x44/0x370 [ 21.673700] hidinput_connect+0xcb6/0x2630 [ 21.673700] hid_connect+0xf74/0x1d60 [ 21.673700] hid_hw_start+0x8c/0x110 [ 21.673700] asus_probe+0x5a3/0xf80 [ 21.673700] hid_device_probe+0x2ee/0x700 [ 21.673700] really_probe+0x1c6/0x6b0 [ 21.673700] __driver_probe_device+0x24f/0x310 [ 21.673700] driver_probe_device+0x4e/0x220 [...] [ 21.673700] [ 21.673700] Freed by task 54: [ 21.673700] kasan_save_stack+0x3d/0x60 [ 21.673700] kasan_save_track+0x18/0x40 [ 21.673700] kasan_save_free_info+0x3f/0x60 [ 21.673700] __kasan_slab_free+0x3c/0x50 [ 21.673700] kfre ---truncated---
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
9ce12d8be12c94334634dd57050444910415e45f to < 9a9e4a8317437bf944fa017c66e1e23a0368b5c7affected9ce12d8be12c94334634dd57050444910415e45f to < 7170122e2ae4ab378c9cdf7cc54dea8b0abbbca5affected9ce12d8be12c94334634dd57050444910415e45f to < eaae728e7335b5dbad70966e2bd520a731fdf7b2affected9ce12d8be12c94334634dd57050444910415e45f to < a8ca8fe7f516d27ece3afb995c3bd4d07dcbe62caffected9ce12d8be12c94334634dd57050444910415e45f to < 5f3c0839b173f7f33415eb098331879e547d1d2daffected9ce12d8be12c94334634dd57050444910415e45f to < c0d77e3441a92d0b4958193c9ac1c3f81c6f1d1caffected9ce12d8be12c94334634dd57050444910415e45f to < 72a4ec018c9e9bc52f4f80eb3afb5d6a6b752275affected9ce12d8be12c94334634dd57050444910415e45f to < d3af6ca9a8c34bbd8cff32b469b84c9021c9e7e4affected
Linux Linux
Default version status: affected
4.10affected0 to < 4.10unaffected5.4.298 to ≤ 5.4.*unaffected5.10.242 to ≤ 5.10.*unaffected5.15.191 to ≤ 5.15.*unaffected6.1.150 to ≤ 6.1.*unaffected6.6.104 to ≤ 6.6.*unaffected6.12.45 to ≤ 6.12.*unaffected6.16.5 to ≤ 6.16.*unaffected6.17 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/9a9e4a8317437bf944fa017c66e1e23a0368b5c7 ↗
- https://git.kernel.org/stable/c/7170122e2ae4ab378c9cdf7cc54dea8b0abbbca5 ↗
- https://git.kernel.org/stable/c/eaae728e7335b5dbad70966e2bd520a731fdf7b2 ↗
- https://git.kernel.org/stable/c/a8ca8fe7f516d27ece3afb995c3bd4d07dcbe62c ↗
- https://git.kernel.org/stable/c/5f3c0839b173f7f33415eb098331879e547d1d2d ↗
- https://git.kernel.org/stable/c/c0d77e3441a92d0b4958193c9ac1c3f81c6f1d1c ↗
- https://git.kernel.org/stable/c/72a4ec018c9e9bc52f4f80eb3afb5d6a6b752275 ↗
- https://git.kernel.org/stable/c/d3af6ca9a8c34bbd8cff32b469b84c9021c9e7e4 ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html ↗