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Fencer Vulns
high 8.8

CVE-2025-39806 json

HID: multitouch: fix slab out-of-bounds access in mt_report_fixup()

published 2025-09-16 13 mo ago modified 2026-10-19 20 d ago also EUVD-2025-29608

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits
0
none known

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 [...]

Patch / fix

  • Linux Linux 5.15.191, 6.1.150, 6.6.104, 6.11, 6.12.45, 6.16.5, 6.17
  • Siemens SIMATIC CN 4100 V5.0
  • linux Debian 12 6.1.153-1
  • linux Debian 13 6.12.48-1
  • linux Debian 14 6.16.5-1

debian advisories DEBIAN-CVE-2025-39806

  • linux Ubuntu 22.04 LTS 5.15.0-163.173
  • linux Ubuntu 24.04 LTS 6.8.0-106.106
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1097.104
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1050.53
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1097.106
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1052.55
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1093.99
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1048.53

ubuntu advisories UBUNTU-CVE-2025-39806

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 10.1 6.12.0-124.27.1.el10_1
  • rv RHEL 10.1 6.12.0-124.27.1.el10_1
  • perf RHEL 10.1 6.12.0-124.27.1.el10_1
  • rtla RHEL 10.1 6.12.0-124.27.1.el10_1
  • libperf RHEL 10.1 6.12.0-124.27.1.el10_1
  • kernel-rt RHEL 10.1 6.12.0-124.27.1.el10_1
  • kernel-64k RHEL 10.1 6.12.0-124.27.1.el10_1
  • kernel-core RHEL 10.1 6.12.0-124.27.1.el10_1

red hat advisories RHSA-2026:0457RHSA-2026:0453RHSA-2026:0445RHSA-2026:0271

  • kernel-rt Linux Micro 6.2 6.12.0-160000.6.1
  • kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-source SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-default SLES 16.0, SLE High Availability Extension 16.0, Linux Micro 6.2 +1 more 6.12.0-160000.6.1
  • kernel-default-base SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1.160000.2.4
  • kernel-syms SLES 16.0, Linux Micro Extras 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
  • kernel-obs-qa SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.6.1
  • kernel-kvmsmall SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.6.1

suse advisories SUSE-SU-2025:21074-1SUSE-SU-2025:21139-1SUSE-SU-2026:20560-1SUSE-SU-2025:21179-1SUSE-SU-2025:4141-1SUSE-SU-2025:4132-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.6.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.6.1
  • kernel-kvmsmall openSUSE Leap 16.0 6.12.0-160000.6.1

opensuse advisories openSUSE-SU-2025:20081-1

  • kernel AlmaLinux 9 5.14.0-611.20.1.el9_7
  • rv AlmaLinux 9 5.14.0-611.20.1.el9_7
  • perf AlmaLinux 9 5.14.0-611.20.1.el9_7
  • rtla AlmaLinux 9 5.14.0-611.20.1.el9_7
  • libperf AlmaLinux 9 5.14.0-611.20.1.el9_7
  • kernel-rt AlmaLinux 9 5.14.0-611.20.1.el9_7
  • kernel-64k AlmaLinux 9 5.14.0-611.20.1.el9_7
  • kernel-core AlmaLinux 9 5.14.0-611.20.1.el9_7

almalinux advisories ALSA-2026:0445ALSA-2026:0453

  • kernel Rocky Linux 10 6.12.0-124.27.1.el10_1
  • kernel Rocky Linux 9 5.14.0-611.20.1.el9_7

rocky linux advisories RLSA-2026:0453RLSA-2026:0445

  • kernel CBL-Mariner 2.0 5.15.200.1-1

azure linux advisories AZL-74700

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-39806 updated cvss 5.8

kernel: HID: multitouch: fix slab out-of-bounds access in mt_report_fixup()

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.77.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.77.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.77.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.77.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.77.1.el9_6
    fixed: vendor fix RHSA-2026:0457
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-611.20.1.el9_7, perf 5.14.0-611.20.1.el9_7, rtla 5.14.0-611.20.1.el9_7, python3-perf 5.14.0-611.20.1.el9_7, kernel-devel-matched 5.14.0-611.20.1.el9_7, kernel-64k-devel-matched 5.14.0-611.20.1.el9_7, +7 more
    fixed: vendor fix RHSA-2026:0445
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-124.27.1.el10_1, perf 6.12.0-124.27.1.el10_1, rtla 6.12.0-124.27.1.el10_1, python3-perf 6.12.0-124.27.1.el10_1, kernel-devel-matched 6.12.0-124.27.1.el10_1, kernel-64k-devel-matched 6.12.0-124.27.1.el10_1, +7 more
    fixed: vendor fix RHSA-2026:0453
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-devel-matched 6.12.0-55.52.1.el10_0, kernel-64k-devel-matched 6.12.0-55.52.1.el10_0, kernel-debug-devel-matched 6.12.0-55.52.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.52.1.el10_0, kernel-zfcpdump-devel-matched 6.12.0-55.52.1.el10_0, kernel-64k-debug-devel-matched 6.12.0-55.52.1.el10_0, +3 more
    fixed: vendor fix RHSA-2026:0271
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.77.1.el9_6, perf 5.14.0-570.77.1.el9_6, rtla 5.14.0-570.77.1.el9_6, python3-perf 5.14.0-570.77.1.el9_6, kernel-devel-matched 5.14.0-570.77.1.el9_6, kernel-64k-devel-matched 5.14.0-570.77.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:0457
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-611.20.1.el9_7, kernel-64k 5.14.0-611.20.1.el9_7, kernel-core 5.14.0-611.20.1.el9_7, kernel-tools 5.14.0-611.20.1.el9_7, kernel-modules 5.14.0-611.20.1.el9_7, kernel-64k-core 5.14.0-611.20.1.el9_7, +27 more
    fixed: vendor fix RHSA-2026:0445
show 15 more
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-124.27.1.el10_1, kernel-64k 6.12.0-124.27.1.el10_1, kernel-core 6.12.0-124.27.1.el10_1, kernel-tools 6.12.0-124.27.1.el10_1, kernel-modules 6.12.0-124.27.1.el10_1, kernel-64k-core 6.12.0-124.27.1.el10_1, +28 more
    fixed: vendor fix RHSA-2026:0453
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.52.1.el10_0, kernel-64k 6.12.0-55.52.1.el10_0, kernel-core 6.12.0-55.52.1.el10_0, kernel-tools 6.12.0-55.52.1.el10_0, kernel-modules 6.12.0-55.52.1.el10_0, kernel-64k-core 6.12.0-55.52.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:0271
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.77.1.el9_6, kernel-64k 5.14.0-570.77.1.el9_6, kernel-core 5.14.0-570.77.1.el9_6, kernel-tools 5.14.0-570.77.1.el9_6, kernel-modules 5.14.0-570.77.1.el9_6, kernel-64k-core 5.14.0-570.77.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:0457
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-611.20.1.el9_7, kernel-debuginfo-common-s390x 5.14.0-611.20.1.el9_7, kernel-debuginfo-common-x86_64 5.14.0-611.20.1.el9_7, kernel-debuginfo-common-aarch64 5.14.0-611.20.1.el9_7, kernel-debuginfo-common-ppc64le 5.14.0-611.20.1.el9_7
    fixed: vendor fix RHSA-2026:0445
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-124.27.1.el10_1, kernel-debuginfo-common-s390x 6.12.0-124.27.1.el10_1, kernel-debuginfo-common-x86_64 6.12.0-124.27.1.el10_1, kernel-debuginfo-common-aarch64 6.12.0-124.27.1.el10_1, kernel-debuginfo-common-ppc64le 6.12.0-124.27.1.el10_1
    fixed: vendor fix RHSA-2026:0453
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-debuginfo-common-s390x 6.12.0-55.52.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.52.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.52.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.52.1.el10_0
    fixed: vendor fix RHSA-2026:0271
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-611.20.1.el9_7, kernel-rt-64k 5.14.0-611.20.1.el9_7, kernel-rt-core 5.14.0-611.20.1.el9_7, kernel-rt-modules 5.14.0-611.20.1.el9_7, kernel-rt-64k-core 5.14.0-611.20.1.el9_7, kernel-rt-debug-core 5.14.0-611.20.1.el9_7, +14 more
    fixed: vendor fix RHSA-2026:0445
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-124.27.1.el10_1, kernel-rt-64k 6.12.0-124.27.1.el10_1, kernel-rt-core 6.12.0-124.27.1.el10_1, kernel-rt-modules 6.12.0-124.27.1.el10_1, kernel-rt-64k-core 6.12.0-124.27.1.el10_1, kernel-rt-debug-core 6.12.0-124.27.1.el10_1, +14 more
    fixed: vendor fix RHSA-2026:0453
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.52.1.el10_0, kernel-rt-64k 6.12.0-55.52.1.el10_0, kernel-rt-core 6.12.0-55.52.1.el10_0, kernel-rt-modules 6.12.0-55.52.1.el10_0, kernel-rt-64k-core 6.12.0-55.52.1.el10_0, kernel-rt-debug-core 6.12.0-55.52.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:0271
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.77.1.el9_6, kernel-rt-64k 5.14.0-570.77.1.el9_6, kernel-rt-core 5.14.0-570.77.1.el9_6, kernel-rt-modules 5.14.0-570.77.1.el9_6, kernel-rt-64k-core 5.14.0-570.77.1.el9_6, kernel-rt-debug-core 5.14.0-570.77.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:0457
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-611.20.1.el9_7, kernel-rt-core 5.14.0-611.20.1.el9_7, kernel-rt-modules 5.14.0-611.20.1.el9_7, kernel-rt-debug-core 5.14.0-611.20.1.el9_7, kernel-rt-modules-core 5.14.0-611.20.1.el9_7, kernel-rt-debug-modules 5.14.0-611.20.1.el9_7, +4 more
    fixed: vendor fix RHSA-2026:0445
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-124.27.1.el10_1, kernel-rt-core 6.12.0-124.27.1.el10_1, kernel-rt-modules 6.12.0-124.27.1.el10_1, kernel-rt-debug-core 6.12.0-124.27.1.el10_1, kernel-rt-modules-core 6.12.0-124.27.1.el10_1, kernel-rt-debug-modules 6.12.0-124.27.1.el10_1, +4 more
    fixed: vendor fix RHSA-2026:0453
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt 6.12.0-55.52.1.el10_0, kernel-rt-kvm 6.12.0-55.52.1.el10_0, kernel-rt-core 6.12.0-55.52.1.el10_0, kernel-rt-modules 6.12.0-55.52.1.el10_0, kernel-rt-debug-kvm 6.12.0-55.52.1.el10_0, kernel-rt-debug-core 6.12.0-55.52.1.el10_0, +6 more
    fixed: vendor fix RHSA-2026:0271
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt 5.14.0-570.77.1.el9_6, kernel-rt-kvm 5.14.0-570.77.1.el9_6, kernel-rt-core 5.14.0-570.77.1.el9_6, kernel-rt-modules 5.14.0-570.77.1.el9_6, kernel-rt-debug-kvm 5.14.0-570.77.1.el9_6, kernel-rt-debug-core 5.14.0-570.77.1.el9_6, +6 more
    fixed: vendor fix RHSA-2026:0457
  • Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.52.1.el10_0, perf 6.12.0-55.52.1.el10_0, rtla 6.12.0-55.52.1.el10_0, python3-perf 6.12.0-55.52.1.el10_0 Red Hat Enterprise Linux BaseOS EUS (v. 10.0) perf-debuginfo 6.12.0-55.52.1.el10_0, libperf-debuginfo 6.12.0-55.52.1.el10_0, python3-perf-debuginfo 6.12.0-55.52.1.el10_0 Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.52.1.el10_0 Red Hat Enterprise Linux Real Time EUS (v. 10.0) perf-debuginfo 6.12.0-55.52.1.el10_0, libperf-debuginfo 6.12.0-55.52.1.el10_0, python3-perf-debuginfo 6.12.0-55.52.1.el10_0
    +1 more products
    Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) perf-debuginfo 6.12.0-55.52.1.el10_0, libperf-debuginfo 6.12.0-55.52.1.el10_0, python3-perf-debuginfo 6.12.0-55.52.1.el10_0
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 14% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

  • Linux Linux
  • Siemens SIMATIC CN 4100

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.