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CVE Record

CVE-2024-26672: drm/amdgpu: Fix variable 'mca_funcs' dereferenced before NULL check in 'amdgpu_mca_smu_get_mca_entry()'

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Fix variable 'mca_funcs' dereferenced before NULL check in 'amdgpu_mca_smu_get_mca_entry()' Fixes the below: drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c:377 amdgpu_mca_smu_get_mca_entry() warn: variable dereferenced before check 'mca_funcs' (see line 368) 357 int amdgpu_mca_smu_get_mca_entry(struct amdgpu_device *adev, enum amdgpu_mca_error_type type, 358 int idx, struct mca_bank_entry *entry) 359 { 360 const struct amdgpu_mca_smu_funcs *mca_funcs = adev->mca.mca_funcs; 361 int count; 362 363 switch (type) { 364 case AMDGPU_MCA_ERROR_TYPE_UE: 365 count = mca_funcs->max_ue_count; mca_funcs is dereferenced here. 366 break; 367 case AMDGPU_MCA_ERROR_TYPE_CE: 368 count = mca_funcs->max_ce_count; mca_funcs is dereferenced here. 369 break; 370 default: 371 return -EINVAL; 372 } 373 374 if (idx >= count) 375 return -EINVAL; 376 377 if (mca_funcs && mca_funcs->mca_get_mca_entry) ^^^^^^^^^ Checked too late!

HighCVSS 7.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel AMDGPU driver flaw where code can use a pointer before confirming it is valid. On affected systems, a local low-privileged user could potentially cause sensitive data exposure or a kernel crash. The provided sources do not show remote exploitation or confirmed active abuse.

Executive priority

Treat as high priority for shared Linux GPU environments, but not as an emergency internet-facing issue based on supplied evidence. Patch through normal kernel update channels with accelerated scheduling for multi-user systems.

Technical view

The issue is in amdgpu_mca_smu_get_mca_entry(), where mca_funcs is dereferenced for MCA error counts before the later NULL check. The CVSS vector is local, low complexity, low privilege, no user interaction, with high confidentiality and availability impact. Kernel stable commits are referenced as fixes.

Likely exposure

Exposure is limited to Linux systems running affected kernel builds with the AMDGPU driver code path present. Business risk is higher on shared Linux workstations, GPU compute nodes, or servers where non-admin users have local access.

Exploitation context

The source bundle marks KEV as false and provides no cited evidence of active exploitation. The CVSS vector indicates exploitation requires local authenticated access, not a network-only path.

Researcher notes

The evidence supports a NULL-check ordering defect in AMDGPU MCA handling. The affected-version data is broad and should be reconciled against distribution kernels because vendors may backport fixes without changing major kernel versions.

Mitigation direction

  • Update to a kernel containing the referenced stable fixes.
  • Use distribution-supported kernel packages or vendor backports.
  • Prioritize shared GPU systems with local user access.
  • Restrict untrusted local access until patched.
  • Check vendor guidance for affected distribution kernels.

Validation and detection

  • Inventory Linux kernel versions on AMDGPU-capable systems.
  • Confirm whether the referenced stable commits are included.
  • Review distribution advisories for backported fixed packages.
  • Check whether shared systems allow non-admin local users.
  • Document exceptions where vendor fixes are unavailable.
Prepared
Confidence
medium
Sources
4

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

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CVE-2024-26672 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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
3Source 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
7.1CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H1.85.2CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

7.1High
CVSS 3.1 vector shape for CVE-2024-26672Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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
LinuxLinuxd38ceaf99ed015f2a0b9af3499791bd3a3daae21, d38ceaf99ed015f2a0b9af3499791bd3a3daae21unaffected
LinuxLinux4.2, 0, 6.7.4, 6.8affected
Weakness

CWE details

No CWE listed

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