CVE-2026-99151 (GCVE-0-2026-99151)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:35 – Updated: 2026-10-28 10:35
VLAI
Title
drm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions
Summary
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)
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0b1eebd359685dd681f6e0df5540a5bb985a27bf , < 4c8b5e5b9776ad08138d79b14238c5742b32911b (git)
Affected: 8fa813b7fd1eccbed13e126166cf764f1f11a7d3 , < 55a67aa89342545b89f469dea6f29bfb6fac6f3d (git)
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Linux Linux Affected: 7.2.9 , < 7.2.13 (semver)
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{
  "containers": {
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          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/link/link_dpms.c"
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      "descriptions": [
        {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions\n\nallocate_usb4_bandwidth_for_stream() and allocate_usb4_bandwidth() both\nuse ASSERT(stream-\u003esink) before dereferencing stream-\u003esink-\u003elink. ASSERT\nis compiled out in production builds, so a NULL stream-\u003esink causes a\nNULL pointer dereference.\n\nlink_set_dpms_off() already guards two earlier accesses to stream-\u003esink\nwith explicit NULL checks, confirming that stream-\u003esink can legitimately\nbe NULL. The subsequent call to deallocate_usb4_bandwidth() had no\nequivalent guard.\n\nReplace the ASSERT() calls with proper NULL checks that return false\nearly, and add a matching stream-\u003esink guard at the call site in\nlink_set_dpms_off() consistent with the surrounding pattern.\n\nv2: Keep the existing ASSERT() calls for diagnostics (to report\n    unexpected NULL sink), and add explicit NULL checks that return false\n    before dereferencing stream-\u003esink. Also add a matching stream-\u003esink\n    guard at the deallocation call site in link_set_dpms_off(). (Alex)\n\n(cherry picked from commit 98029a0ce61feb52c563f65349dd9b25f672e355)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-28T10:35:06.866Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/4c8b5e5b9776ad08138d79b14238c5742b32911b"
        },
        {
          "url": "https://git.kernel.org/stable/c/55a67aa89342545b89f469dea6f29bfb6fac6f3d"
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      "title": "drm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99151",
    "datePublished": "2026-10-28T10:35:06.866Z",
    "dateReserved": "2026-09-25T10:25:14.396Z",
    "dateUpdated": "2026-10-28T10:35:06.866Z",
    "state": "PUBLISHED"
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions\n\nallocate_usb4_bandwidth_for_stream() and allocate_usb4_bandwidth() both\nuse ASSERT(stream-\u003esink) before dereferencing stream-\u003esink-\u003elink. ASSERT\nis compiled out in production builds, so a NULL stream-\u003esink causes a\nNULL pointer dereference.\n\nlink_set_dpms_off() already guards two earlier accesses to stream-\u003esink\nwith explicit NULL checks, confirming that stream-\u003esink can legitimately\nbe NULL. The subsequent call to deallocate_usb4_bandwidth() had no\nequivalent guard.\n\nReplace the ASSERT() calls with proper NULL checks that return false\nearly, and add a matching stream-\u003esink guard at the call site in\nlink_set_dpms_off() consistent with the surrounding pattern.\n\nv2: Keep the existing ASSERT() calls for diagnostics (to report\n    unexpected NULL sink), and add explicit NULL checks that return false\n    before dereferencing stream-\u003esink. Also add a matching stream-\u003esink\n    guard at the deallocation call site in link_set_dpms_off(). (Alex)\n\n(cherry picked from commit 98029a0ce61feb52c563f65349dd9b25f672e355)"
          }
        ],
        "id": "CVE-2026-99151",
        "lastModified": "2026-10-28T11:17:35.207",
        "metrics": {},
        "published": "2026-10-28T11:17:35.207",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "vulnStatus": "Received"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-30T07:04:30+00:00",
      "cve": "CVE-2026-99151",
      "id": "CVE-2026-99151",
      "initial_release_date": "2026-10-28T10:35:06.866000+00:00",
      "product_status:known_affected": "279",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: Denial of Service via NULL pointer dereference in AMD display driver",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99151.json",
      "version": "3"
    }
  }
}



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