GHSA-R5JQ-CWP5-XXHF
Vulnerability from github – Published: 2025-09-16 15:32 – Updated: 2026-01-16 21:30In the Linux kernel, the following vulnerability has been resolved:
HID: multitouch: fix slab out-of-bounds access in mt_report_fixup()
A malicious HID device can trigger a slab out-of-bounds during mt_report_fixup() by passing in report descriptor smaller than 607 bytes. mt_report_fixup() attempts to patch byte offset 607 of the descriptor with 0x25 by first checking if byte offset 607 is 0x15 however it lacks bounds checks to verify if the descriptor is big enough before conducting this check. Fix this bug by ensuring the descriptor size is at least 608 bytes before accessing it.
Below is the KASAN splat after the out of bounds access happens:
[ 13.671954] ================================================================== [ 13.672667] BUG: KASAN: slab-out-of-bounds in mt_report_fixup+0x103/0x110 [ 13.673297] Read of size 1 at addr ffff888103df39df by task kworker/0:1/10 [ 13.673297] [ 13.673297] CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted 6.15.0-00005-gec5d573d83f4-dirty #3 [ 13.673297] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/04 [ 13.673297] Call Trace: [ 13.673297] [ 13.673297] dump_stack_lvl+0x5f/0x80 [ 13.673297] print_report+0xd1/0x660 [ 13.673297] kasan_report+0xe5/0x120 [ 13.673297] __asan_report_load1_noabort+0x18/0x20 [ 13.673297] mt_report_fixup+0x103/0x110 [ 13.673297] hid_open_report+0x1ef/0x810 [ 13.673297] mt_probe+0x422/0x960 [ 13.673297] hid_device_probe+0x2e2/0x6f0 [ 13.673297] really_probe+0x1c6/0x6b0 [ 13.673297] __driver_probe_device+0x24f/0x310 [ 13.673297] driver_probe_device+0x4e/0x220 [ 13.673297] __device_attach_driver+0x169/0x320 [ 13.673297] bus_for_each_drv+0x11d/0x1b0 [ 13.673297] __device_attach+0x1b8/0x3e0 [ 13.673297] device_initial_probe+0x12/0x20 [ 13.673297] bus_probe_device+0x13d/0x180 [ 13.673297] device_add+0xe3a/0x1670 [ 13.673297] hid_add_device+0x31d/0xa40 [...]
{
"affected": [],
"aliases": [
"CVE-2025-39806"
],
"database_specific": {
"cwe_ids": [
"CWE-125"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-16T13:15:51Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: multitouch: fix slab out-of-bounds access in mt_report_fixup()\n\nA malicious HID device can trigger a slab out-of-bounds during\nmt_report_fixup() by passing in report descriptor smaller than\n607 bytes. mt_report_fixup() attempts to patch byte offset 607\nof the descriptor with 0x25 by first checking if byte offset\n607 is 0x15 however it lacks bounds checks to verify if the\ndescriptor is big enough before conducting this check. Fix\nthis bug by ensuring the descriptor size is at least 608\nbytes before accessing it.\n\nBelow is the KASAN splat after the out of bounds access happens:\n\n[ 13.671954] ==================================================================\n[ 13.672667] BUG: KASAN: slab-out-of-bounds in mt_report_fixup+0x103/0x110\n[ 13.673297] Read of size 1 at addr ffff888103df39df by task kworker/0:1/10\n[ 13.673297]\n[ 13.673297] CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted 6.15.0-00005-gec5d573d83f4-dirty #3\n[ 13.673297] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/04\n[ 13.673297] Call Trace:\n[ 13.673297] \u003cTASK\u003e\n[ 13.673297] dump_stack_lvl+0x5f/0x80\n[ 13.673297] print_report+0xd1/0x660\n[ 13.673297] kasan_report+0xe5/0x120\n[ 13.673297] __asan_report_load1_noabort+0x18/0x20\n[ 13.673297] mt_report_fixup+0x103/0x110\n[ 13.673297] hid_open_report+0x1ef/0x810\n[ 13.673297] mt_probe+0x422/0x960\n[ 13.673297] hid_device_probe+0x2e2/0x6f0\n[ 13.673297] really_probe+0x1c6/0x6b0\n[ 13.673297] __driver_probe_device+0x24f/0x310\n[ 13.673297] driver_probe_device+0x4e/0x220\n[ 13.673297] __device_attach_driver+0x169/0x320\n[ 13.673297] bus_for_each_drv+0x11d/0x1b0\n[ 13.673297] __device_attach+0x1b8/0x3e0\n[ 13.673297] device_initial_probe+0x12/0x20\n[ 13.673297] bus_probe_device+0x13d/0x180\n[ 13.673297] device_add+0xe3a/0x1670\n[ 13.673297] hid_add_device+0x31d/0xa40\n[...]",
"id": "GHSA-r5jq-cwp5-xxhf",
"modified": "2026-01-16T21:30:26Z",
"published": "2025-09-16T15:32:35Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39806"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0379eb8691b9c4477da0277ae0832036ca4410b4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3055309821dd3da92888f88bad10f0324c3c89fe"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4263e5851779f7d8ebfbc9cc7d2e9b0217adba8d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7ab7311c43ae19c66c53ccd8c5052a9072a4e338"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c13e95587583d018cfbcc277df7e02d41902ac5a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d4e6e2680807671e1c73cd6a986b33659ce92f2b"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"type": "CVSS_V3"
}
]
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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- Confirmed: The vulnerability has been validated from an analyst's perspective.
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- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.