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CVE Record

CVE-2024-26662: drm/amd/display: Fix 'panel_cntl' could be null in 'dcn21_set_backlight_level()'

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix 'panel_cntl' could be null in 'dcn21_set_backlight_level()' 'panel_cntl' structure used to control the display panel could be null, dereferencing it could lead to a null pointer access. Fixes the below: drivers/gpu/drm/amd/amdgpu/../display/dc/hwss/dcn21/dcn21_hwseq.c:269 dcn21_set_backlight_level() error: we previously assumed 'panel_cntl' could be null (see line 250)

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2024-26662 is a Linux kernel AMD display bug where a missing null check can crash affected systems when backlight handling reaches a null panel control structure. The business impact is availability, not data theft or privilege escalation, based on the supplied CVSS vector.

Executive priority

Treat as routine but real availability risk. Patch through normal kernel update cycles, with earlier attention for user endpoints, kiosks, or operational displays where a local crash could disrupt work.

Technical view

The flaw is in drm/amd/display, specifically dcn21_set_backlight_level(). The code could dereference a null panel_cntl pointer after earlier logic acknowledged it might be null. CVSS 3.1 is 5.5: local, low-complexity, low-privilege, no user interaction, high availability impact.

Likely exposure

Exposure is most likely on Linux systems using affected kernels with AMDGPU display/backlight paths. Server-only systems without relevant AMD display hardware or driver paths are less likely exposed, but kernel packaging and backports must be checked by distribution.

Exploitation context

The source bundle does not show CISA KEV listing or any cited active exploitation. The CVSS vector requires local access and low privileges, so urgency is mainly around local denial-of-service risk on exposed endpoints.

Researcher notes

Evidence is limited to the CVE record and Linux stable commit references. The issue is a defensive null-pointer fix in AMD display backlight code. No source in the bundle identifies remote attack surface, confidentiality impact, integrity impact, or known exploitation.

Mitigation direction

  • Apply Linux kernel updates that include the referenced stable fixes.
  • Check distribution advisories for backported fixes before relying on version numbers alone.
  • Prioritize laptops, workstations, and kiosks using AMD display hardware.
  • If patching is delayed, follow vendor guidance for reducing AMDGPU display driver exposure.

Validation and detection

  • Inventory Linux kernel versions across AMD-based endpoints and workstations.
  • Confirm whether the running kernel includes one of the referenced stable commits or distro backport.
  • Review package changelogs for CVE-2024-26662 or the panel_cntl null dereference fix.
  • Monitor local crash reports for amdgpu or drm display backlight call traces.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2024-26662 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.5 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
3Timeline events
2ADP providers
4Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2024-26662Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux474ac4a875ca6fea3fc5183d3ad22ef7523dca53, 474ac4a875ca6fea3fc5183d3ad22ef7523dca53, 474ac4a875ca6fea3fc5183d3ad22ef7523dca53unaffected
LinuxLinux5.9, 0, 6.6.17, 6.7.5, 6.8affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.