CVE-2025-39806 (GCVE-0-2025-39806)

Vulnerability from cvelistv5 – Published: 2025-09-16 13:00 – Updated: 2026-08-05 12:05
VLAI
Title
HID: multitouch: fix slab out-of-bounds access in mt_report_fixup()
Summary
In 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] <TASK> [ 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 [...]
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-10 20:41 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 54/100 over 6633 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7d91a0b2151a9c3b61d44c85c8eba930eddd1dd0 , < 4263e5851779f7d8ebfbc9cc7d2e9b0217adba8d (git)
Affected: 45ec9f17ce46417fc4eccecf388c99e81fb7fcc1 , < 7ab7311c43ae19c66c53ccd8c5052a9072a4e338 (git)
Affected: 1d5c7d0a49ec9d8786f266ac6d1d7c4960e1787b , < d4e6e2680807671e1c73cd6a986b33659ce92f2b (git)
Affected: c8000deb68365b461b324d68c7ea89d730f0bb85 , < 3055309821dd3da92888f88bad10f0324c3c89fe (git)
Affected: c8000deb68365b461b324d68c7ea89d730f0bb85 , < c13e95587583d018cfbcc277df7e02d41902ac5a (git)
Affected: c8000deb68365b461b324d68c7ea89d730f0bb85 , < 0379eb8691b9c4477da0277ae0832036ca4410b4 (git)
Affected: d189e24a42b8bd0ece3d28801d751bf66dba8e92 (git)
Affected: 5.15.168 , < 5.15.191 (semver)
Affected: 6.1.111 , < 6.1.150 (semver)
Affected: 6.6.52 , < 6.6.104 (semver)
Affected: 6.10.11 , < 6.11 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 5.15.191 , ≤ 5.15.* (semver)
Unaffected: 6.1.150 , ≤ 6.1.* (semver)
Unaffected: 6.6.104 , ≤ 6.6.* (semver)
Unaffected: 6.12.45 , ≤ 6.12.* (semver)
Unaffected: 6.16.5 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
guessed Create a notification for this product.
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          "value": "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[...]"
        }
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            "baseSeverity": "HIGH",
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            "version": "3.1"
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            {
              "lang": "en",
              "value": "AV:A - hid-multitouch binds on HID_BUS_ANY, and for Bluetooth HID the vendor/product IDs and the entire report descriptor come from the remote peer via hidp_connadd_req (net/bluetooth/hidp/core.c:773-791), so an attacker within Bluetooth range can present VID 0x27c6/PID 0x01e8 with a short descriptor; a malicious USB device reaches the identical path.\nAC:L - The attacker fully controls both trigger conditions \u2014 the vendor/product IDs and the descriptor length \u2014 so a descriptor under 608 bytes deterministically drives the out-of-bounds access on every probe, with no race or unknown state involved.\nPR:N - The fault occurs in mt_probe()/hid_open_report() during device enumeration, before any userspace interaction with the device, so the attacker needs no account or privileges on the target system.\nUI:N - Driver probe and report-descriptor fixup run automatically when the HID transport connects, with no victim action required beyond the device being attached or connected.\nS:U - The out-of-bounds read and write stay within the kernel\u0027s own slab memory and the kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The read at rdesc[607] reaches into an adjacent slab object whose bucket the attacker selects via the descriptor size, and the else-branch prints that out-of-bounds byte to the kernel log (\"got: %x\"), giving a repeatable, attacker-positioned heap disclosure primitive.\nI:H - When the out-of-bounds byte reads as 0x15 the code writes 0x25 back to it, producing a genuine slab out-of-bounds write into a neighbouring, heap-groomable object that can corrupt adjacent kernel structures.\nA:H - The out-of-bounds access triggers a KASAN BUG (panic with panic_on_warn), can fault on an unmapped page under KFENCE or small allocations, and the stray write can corrupt adjacent objects into a later kernel crash."
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            {
              "lang": "en",
              "value": "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[...]"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:A - hid-multitouch binds on HID_BUS_ANY, and for Bluetooth HID the vendor/product IDs and the entire report descriptor come from the remote peer via hidp_connadd_req (net/bluetooth/hidp/core.c:773-791), so an attacker within Bluetooth range can present VID 0x27c6/PID 0x01e8 with a short descriptor; a malicious USB device reaches the identical path.\nAC:L - The attacker fully controls both trigger conditions \u2014 the vendor/product IDs and the descriptor length \u2014 so a descriptor under 608 bytes deterministically drives the out-of-bounds access on every probe, with no race or unknown state involved.\nPR:N - The fault occurs in mt_probe()/hid_open_report() during device enumeration, before any userspace interaction with the device, so the attacker needs no account or privileges on the target system.\nUI:N - Driver probe and report-descriptor fixup run automatically when the HID transport connects, with no victim action required beyond the device being attached or connected.\nS:U - The out-of-bounds read and write stay within the kernel\u0027s own slab memory and the kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The read at rdesc[607] reaches into an adjacent slab object whose bucket the attacker selects via the descriptor size, and the else-branch prints that out-of-bounds byte to the kernel log (\"got: %x\"), giving a repeatable, attacker-positioned heap disclosure primitive.\nI:H - When the out-of-bounds byte reads as 0x15 the code writes 0x25 back to it, producing a genuine slab out-of-bounds write into a neighbouring, heap-groomable object that can corrupt adjacent kernel structures.\nA:H - The out-of-bounds access triggers a KASAN BUG (panic with panic_on_warn), can fault on an unmapped page under KFENCE or small allocations, and the stray write can corrupt adjacent objects into a later kernel crash."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T12:05:19.463Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/4263e5851779f7d8ebfbc9cc7d2e9b0217adba8d"
            },
            {
              "url": "https://git.kernel.org/stable/c/7ab7311c43ae19c66c53ccd8c5052a9072a4e338"
            },
            {
              "url": "https://git.kernel.org/stable/c/d4e6e2680807671e1c73cd6a986b33659ce92f2b"
            },
            {
              "url": "https://git.kernel.org/stable/c/3055309821dd3da92888f88bad10f0324c3c89fe"
            },
            {
              "url": "https://git.kernel.org/stable/c/c13e95587583d018cfbcc277df7e02d41902ac5a"
            },
            {
              "url": "https://git.kernel.org/stable/c/0379eb8691b9c4477da0277ae0832036ca4410b4"
            }
          ],
          "title": "HID: multitouch: fix slab out-of-bounds access in mt_report_fixup()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-39806",
        "datePublished": "2025-09-16T13:00:09.524Z",
        "dateReserved": "2025-04-16T07:20:57.136Z",
        "dateUpdated": "2026-08-05T12:05:19.463Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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