Operation interruption via invalid atomic-add code generation
Published Sep 25, 2025 · Updated Sep 25, 2025
Reachable assertion in PyTorch 2.6.0 allows context-dependent attackers to interrupt compiled nn.Fold operations on the CPU backend. Inductor's C++ code generator either stores an atomic-add value without first loading and adding it in CppVecKernel or reaches an unsupported atomic_add path in CppTile2DKernel, raising AssertionError during code generation. The failure requires an application to compile an attacker-influenced nn.Fold model with the Inductor CPU backend; the observed consequence is termination of that compilation or inference operation.
Summary
What happened
Reachable assertion in PyTorch 2.6.0 allows context-dependent attackers to interrupt compiled nn.Fold operations on the CPU backend. Inductor's C++ code generator either stores an atomic-add value without first loading and adding it in CppVecKernel or reaches an unsupported atomic_add path in CppTile2DKernel, raising AssertionError during code generation. The failure requires an application to compile an attacker-influenced nn.Fold model with the Inductor CPU backend; the observed consequence is termination of that compilation or inference operation.
The record
- CVE
- CVE-2025-46149
- Published
- Sep 25, 2025
- Updated
- Sep 25, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-617, T1499.004
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 25, 2025CVE publishedPublication date reported by the CVE source.
- Sep 25, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Upstream nn.Fold AssertionError reproducerproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo