CVE-2026-99151
Received Received - Intake

BaseFortify

Publication date: 2026-10-28

Last updated on: 2026-10-28

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions allocate_usb4_bandwidth_for_stream() and allocate_usb4_bandwidth() both use ASSERT(stream->sink) before dereferencing stream->sink->link. ASSERT is compiled out in production builds, so a NULL stream->sink causes a NULL pointer dereference. link_set_dpms_off() already guards two earlier accesses to stream->sink with explicit NULL checks, confirming that stream->sink can legitimately be NULL. The subsequent call to deallocate_usb4_bandwidth() had no equivalent guard. Replace the ASSERT() calls with proper NULL checks that return false early, and add a matching stream->sink guard at the call site in link_set_dpms_off() consistent with the surrounding pattern. v2: Keep the existing ASSERT() calls for diagnostics (to report unexpected NULL sink), and add explicit NULL checks that return false before dereferencing stream->sink. Also add a matching stream->sink guard at the deallocation call site in link_set_dpms_off(). (Alex) (cherry picked from commit 98029a0ce61feb52c563f65349dd9b25f672e355)

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-10-28
Last Modified
2026-10-28
Generated
2026-10-28
AI Q&A
2026-10-28
EPSS Evaluated
N/A
NVD
CVE-2026-99151
EUVD
EUVD-2026-111903

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
Linux Linux 0b1eebd359685dd681f6e0df5540a5bb985a27bf
Linux Linux 8fa813b7fd1eccbed13e126166cf764f1f11a7d3
Linux Linux 7.2.9

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability is in the Linux kernel's AMD display driver. It involves a NULL pointer dereference in USB4 bandwidth functions. The functions allocate_usb4_bandwidth_for_stream() and allocate_usb4_bandwidth() use ASSERT() to check if stream->sink is NULL before dereferencing it. However, ASSERT() is removed in production builds, so a NULL stream->sink leads to a crash. The fix replaces ASSERT() with proper NULL checks and adds guards in link_set_dpms_off().

Detection Guidance

This vulnerability is specific to the Linux kernel's AMD display driver and cannot be detected via network scans or typical system commands. It requires kernel-level inspection for NULL pointer dereferences in USB4 bandwidth functions. Check kernel logs for NULL pointer dereference errors related to drm/amd/display.

Impact Analysis

If exploited, this vulnerability could cause a system crash or instability when handling USB4 bandwidth operations in AMD display drivers. Users may experience sudden freezes, reboots, or application failures during graphics-intensive tasks.

Mitigation Strategies

Update the Linux kernel to a patched version that includes the fix for this vulnerability. Monitor kernel updates from your distribution and apply them promptly. No additional configuration changes are required beyond the kernel update.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-99151. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart