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CVE-2026-98499

Linux: HID: wacom: fix OOB read in wacom_wac_pen_serial_enforce()

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.21%Chance of exploitation activity in the next 30 days, higher than 10% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in9aa62f967b6a4bb30aa3b778e02c8a5ca6bcde51Also 26471d954bbfbfb9032994f7f485802ee20e0582, 456afe4707e23cc114ad833197f63b52bb8fd1e7 and 3 moreCVE List
Published18 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 9aa62f967b6a4bb30aa3b778e02c8a5ca6bcde51LinuxCVE List
  • 26471d954bbfbfb9032994f7f485802ee20e0582LinuxCVE List
  • 456afe4707e23cc114ad833197f63b52bb8fd1e7LinuxCVE List
  • 65e7c4b5366b770c60dfefac3f1d06e33a9e411eLinuxCVE List
  • 4b09b7c84b8633cd041181616bd15bf5e73c164dLinuxCVE List
  • 9aa237cf66495b2426ddde8532e9b08a0ed83aaaLinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

In the Linux kernel, the following vulnerability has been resolved:

HID: wacom: fix OOB read in wacom_wac_pen_serial_enforce()

The 'wacom_wac_pen_serial_enforce()' function may calculate and pass an invalid offset to hid_field_extract(), resulting in memory reads at incorrect addresses -- possibly beyond the end of the report. If a field in the HID descriptor lists more usages than its Report Count actually reserves space for, the function's inner 'j' will walk past the end of the field:

for (i = 0; i < report->maxfield; i++) { for (j = 0; j < report->field[i]->maxusage; j++) { ... value = hid_field_extract(hdev, raw_data + 1, offset + j * size, size);

A descriptor listing 12288 usages against Report Count 1 has the loop extract the usage at index 12287 from bit offset 98296 -- about 12 KB past a 2-byte received report. The value is stored in wacom_wac->serial[0] and can reach userspace as an MSC_SERIAL event, making this an information disclosure.

Clamp the loop to field->report_count, the number of value slots the report holds. Value slots past the last declared usage are still scanned; they reuse that usage (HID 1.11, 6.2.2.8).

Verified on v6.12.105 with a UHID reproducer: a 2-byte report from such a descriptor trips KASAN before the patch and not after it.

Text from CVE List

Affected versions 18

  • Linuxaffected: 83417206427bdf0fef9fa69957807194f25923c3 before 9aa62f967b6a4bb30aa3b778e02c8a5ca6bcde51CVE List
  • Linuxaffected: 83417206427bdf0fef9fa69957807194f25923c3 before 26471d954bbfbfb9032994f7f485802ee20e0582CVE List
  • Linuxaffected: 83417206427bdf0fef9fa69957807194f25923c3 before 456afe4707e23cc114ad833197f63b52bb8fd1e7CVE List
  • Linuxaffected: 83417206427bdf0fef9fa69957807194f25923c3 before 65e7c4b5366b770c60dfefac3f1d06e33a9e411eCVE List
  • Linuxaffected: 83417206427bdf0fef9fa69957807194f25923c3 before eaa7d29341ef4b91e84ad097562982288a7c376cCVE List
  • Linuxaffected: 83417206427bdf0fef9fa69957807194f25923c3 before c3129e6f26e18c0886ede7265f187a7ec289e1d1CVE List
  • Linuxaffected: 83417206427bdf0fef9fa69957807194f25923c3 before 4b09b7c84b8633cd041181616bd15bf5e73c164dCVE List
  • Linuxaffected: 83417206427bdf0fef9fa69957807194f25923c3 before 9aa237cf66495b2426ddde8532e9b08a0ed83aaaCVE List
  • Linuxaffected: 4.16CVE List
  • Linuxunaffected: all versions before 4.16CVE List
  • Linuxunaffected: 5.10.271 through 5.10.*CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.55 through 6.18.*CVE List
  • Linuxunaffected: 7.2.9 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 8