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CVE Record

CVE-2022-50393: drm/amdgpu: SDMA update use unlocked iterator

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: SDMA update use unlocked iterator SDMA update page table may be called from unlocked context, this generate below warning. Use unlocked iterator to handle this case. WARNING: CPU: 0 PID: 1475 at drivers/dma-buf/dma-resv.c:483 dma_resv_iter_next Call Trace: dma_resv_iter_first+0x43/0xa0 amdgpu_vm_sdma_update+0x69/0x2d0 [amdgpu] amdgpu_vm_ptes_update+0x29c/0x870 [amdgpu] amdgpu_vm_update_range+0x2f6/0x6c0 [amdgpu] svm_range_unmap_from_gpus+0x115/0x300 [amdgpu] svm_range_cpu_invalidate_pagetables+0x510/0x5e0 [amdgpu] __mmu_notifier_invalidate_range_start+0x1d3/0x230 unmap_vmas+0x140/0x150 unmap_region+0xa8/0x110

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2022-50393 is a Linux kernel amdgpu driver issue that can affect system availability. The source describes a page-table update path using the wrong iterator when called without a lock, producing a kernel warning. The CVSS vector is local and requires low privileges, so business urgency is highest for shared Linux systems using AMD GPUs.

Executive priority

Treat as a scheduled kernel maintenance item unless affected AMD GPU systems are shared with untrusted local users. It is not evidenced as remotely exploitable or actively exploited, but availability impact can matter for GPU workstations, compute nodes, and multi-user Linux environments.

Technical view

The flaw is in drm/amdgpu SDMA page-table updates. amdgpu_vm_sdma_update may run from an unlocked context but used a dma-resv iterator that expects locking, triggering warnings in the SVM/MMU notifier unmap path. The published CVSS is 5.5, local, low complexity, low privileges, no user interaction, availability high.

Likely exposure

Exposure is most likely on Linux hosts using the amdgpu kernel driver on affected kernel builds. The CVE record lists Linux kernel versions including 4.2, 5.19.17, 6.0.3, and 6.1 as affected. Downstream distribution package impact requires vendor mapping.

Exploitation context

The provided sources do not show active exploitation, and KEV is false. The CVSS vector indicates local access with low privileges, not remote exploitation. Available evidence supports availability impact only, with no stated confidentiality or integrity impact.

Researcher notes

Evidence is limited to the CVE record and upstream stable commit references. The root issue is iterator selection in an unlocked amdgpu SDMA update context. No exploit details, public weaponization, or downstream package matrix were provided in the source bundle.

Mitigation direction

  • Review Linux vendor advisories for kernels containing the referenced stable commits.
  • Prioritize patched kernels on shared systems using AMD GPUs or amdgpu.
  • If patching is delayed, restrict local user access to affected GPU hosts.
  • Track downstream distribution backports rather than relying only on upstream version numbers.

Validation and detection

  • Inventory Linux systems using AMD GPUs and the amdgpu driver.
  • Map running kernel packages against vendor advisories for CVE-2022-50393.
  • Confirm whether referenced stable fixes are included in deployed kernels.
  • Check vulnerability scanners for local-kernel findings, not network exposure.
  • Document systems where distribution impact remains unconfirmed.
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-2022-50393 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
0Timeline events
0ADP providers
4Source links

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:H1.83.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2022-50393Attack 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

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxd38ceaf99ed015f2a0b9af3499791bd3a3daae21, d38ceaf99ed015f2a0b9af3499791bd3a3daae21, d38ceaf99ed015f2a0b9af3499791bd3a3daae21unaffected
LinuxLinux4.2, 0, 5.19.17, 6.0.3, 6.1affected
Weakness

CWE details

No CWE listed

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