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CVE Record

CVE-2022-49221: drm/msm/dp: populate connector of struct dp_panel

In the Linux kernel, the following vulnerability has been resolved: drm/msm/dp: populate connector of struct dp_panel DP CTS test case 4.2.2.6 has valid edid with bad checksum on purpose and expect DP source return correct checksum. During drm edid read, correct edid checksum is calculated and stored at connector::real_edid_checksum. The problem is struct dp_panel::connector never be assigned, instead the connector is stored in struct msm_dp::connector. When we run compliance testing test case 4.2.2.6 dp_panel_handle_sink_request() won't have a valid edid set in struct dp_panel::edid so we'll try to use the connectors real_edid_checksum and hit a NULL pointer dereference error because the connector pointer is never assigned. Changes in V2: -- populate panel connector at msm_dp_modeset_init() instead of at dp_panel_read_sink_caps() Changes in V3: -- remove unhelpful kernel crash trace commit text -- remove renaming dp_display parameter to dp Changes in V4: -- add more details to commit text Changes in v10: -- group into one series Changes in v11: -- drop drm/msm/dp: dp_link_parse_sink_count() return immediately if aux read Signee-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2022-49221 is a Linux kernel crash bug in the MSM DisplayPort driver. A malformed-but-valid EDID checksum scenario can trigger a NULL pointer dereference during DisplayPort handling. The known impact is system availability, not data theft or privilege escalation. It is not listed in KEV, and the supplied sources do not show active exploitation.

Executive priority

Treat as a normal-priority kernel availability fix for affected device fleets. It can crash impacted systems but is not shown to enable compromise. Prioritize patching where MSM DisplayPort hardware is present, especially managed endpoints, embedded devices, or products with strict uptime requirements.

Technical view

In drm/msm/dp, struct dp_panel::connector was not populated while the connector lived in struct msm_dp::connector. During EDID handling for DP CTS case 4.2.2.6, dp_panel_handle_sink_request() could dereference a NULL connector when using real_edid_checksum. CVSS is 5.5: local, low complexity, low privileges, availability impact only.

Likely exposure

Exposure is most likely on Linux systems using the MSM DisplayPort driver and affected kernel versions identified in the CVE record. This is hardware and configuration dependent. Servers without this driver or DisplayPort path are less likely to be exposed, but kernel package backports should be checked.

Exploitation context

The CVE describes a local availability issue requiring low privileges. The trigger relates to DisplayPort EDID handling with a bad checksum used in compliance testing. The supplied sources do not identify remote exploitation, data exposure, privilege escalation, or active exploitation in the wild.

Researcher notes

The record maps this to CWE-476 and cites stable kernel commits resolving connector population in the dp_panel path. Affected-version granularity appears kernel-stream specific, so distribution backports may alter exposure. Avoid assuming exploitability beyond local denial of service without additional evidence.

Mitigation direction

  • Update to a kernel containing the referenced stable fixes or vendor backports.
  • Check Linux distribution advisories for the exact fixed package for your kernel stream.
  • Prioritize endpoints or devices using MSM DisplayPort functionality.
  • If updates are unavailable, follow vendor guidance for temporary risk reduction.

Validation and detection

  • Inventory systems running affected Linux kernel versions from the CVE record.
  • Confirm whether the MSM DisplayPort driver is built, loaded, or used.
  • Review kernel package changelogs for the referenced stable commit IDs.
  • Check logs for kernel oops or NULL pointer dereference events in drm/msm/dp paths.
Prepared
Confidence
high
Sources
7

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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-476: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2022-49221 mapping review

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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
1ADP providers
6Source 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-2022-49221Attack 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

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxf86bc4a1a401d3691bad41e67f9db0c2ea94da32, 7948fe12d47a946fb8025a0534c900e3dd4b5839, 7948fe12d47a946fb8025a0534c900e3dd4b5839, 7948fe12d47a946fb8025a0534c900e3dd4b5839, 7948fe12d47a946fb8025a0534c900e3dd4b5839, ab1ccd1e2584b268784518f838f7cc72faec576b, 08a96864a45b65ee406a344c78dd761b2fd66887unaffected
LinuxLinux5.15, 0, 5.10.110, 5.15.33, 5.16.19, 5.17.2, 5.18affected
Weakness

CWE details

CWE-476

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

CWE-476 · source CWE mapping

NULL Pointer Dereference

NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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