CVE-2023-29942Public exploit

Local mlir-opt crash via SPIR-V conversion

Published May 5, 2023 · Updated Jan 29, 2025

An out-of-bounds read in LLVM Project MLIR commit a0138390 allows local users to crash mlir-opt via crafted SPIR-V input. The published reproducer causes the convert-spirv-to-llvm pass to build an LLVM structure from runtime arrays of differing widths; LLVMStructType::verify then reaches Type::isa and segfaults. Exploitation requires a user to run mlir-opt on attacker-controlled MLIR, and the documented consequence is process termination rather than data access or code execution.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in LLVM Project MLIR commit a0138390 allows local users to crash mlir-opt via crafted SPIR-V input. The published reproducer causes the convert-spirv-to-llvm pass to build an LLVM structure from runtime arrays of differing widths; LLVMStructType::verify then reaches Type::isa and segfaults. Exploitation requires a user to run mlir-opt on attacker-controlled MLIR, and the documented consequence is process termination rather than data access or code execution.

The record

CVE
CVE-2023-29942
Published
May 5, 2023
Updated
Jan 29, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 29, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1204.002Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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