HID: wacom: fix OOB read in wacom_wac_pen_serial_enforce()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98499
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:00 UTC
Updated2026-10-24 14:16:44 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 83417206427bdf0fef9fa69957807194f25923c3 9aa62f967b6a4bb30aa3b778e02c8a5ca6bcde51 git Not specified
CNA Linux Linux affected 83417206427bdf0fef9fa69957807194f25923c3 26471d954bbfbfb9032994f7f485802ee20e0582 git Not specified
CNA Linux Linux affected 83417206427bdf0fef9fa69957807194f25923c3 456afe4707e23cc114ad833197f63b52bb8fd1e7 git Not specified
CNA Linux Linux affected 83417206427bdf0fef9fa69957807194f25923c3 65e7c4b5366b770c60dfefac3f1d06e33a9e411e git Not specified
CNA Linux Linux affected 83417206427bdf0fef9fa69957807194f25923c3 eaa7d29341ef4b91e84ad097562982288a7c376c git Not specified
CNA Linux Linux affected 83417206427bdf0fef9fa69957807194f25923c3 c3129e6f26e18c0886ede7265f187a7ec289e1d1 git Not specified
CNA Linux Linux affected 83417206427bdf0fef9fa69957807194f25923c3 4b09b7c84b8633cd041181616bd15bf5e73c164d git Not specified
CNA Linux Linux affected 83417206427bdf0fef9fa69957807194f25923c3 9aa237cf66495b2426ddde8532e9b08a0ed83aaa git Not specified
CNA Linux Linux affected 4.16 Not specified
CNA Linux Linux unaffected 4.16 semver Not specified
CNA Linux Linux unaffected 5.10.271 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.222 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.55 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.9 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9aa237cf66495b2426ddde8532e9b08a0ed83aaa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9aa62f967b6a4bb30aa3b778e02c8a5ca6bcde51 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/456afe4707e23cc114ad833197f63b52bb8fd1e7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/26471d954bbfbfb9032994f7f485802ee20e0582 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eaa7d29341ef4b91e84ad097562982288a7c376c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4b09b7c84b8633cd041181616bd15bf5e73c164d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c3129e6f26e18c0886ede7265f187a7ec289e1d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/65e7c4b5366b770c60dfefac3f1d06e33a9e411e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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