CVE-2025-3121Public exploit

Process crash via FlatBuffer-loaded model invocation

Published Apr 2, 2025 · Updated Apr 3, 2025

Memory corruption in torch.jit.jit_module_from_flatbuffer in PyTorch 2.6.0 allows local users to crash a process via a FlatBuffer module. The upstream reproduction saves a scripted model containing BatchNorm2d, reloads it through the affected function, and segfaults when the loaded model processes input. The public record does not identify the corrupting memory operation; low-privileged local code execution is required, and the demonstrated consequence is process termination.

CVSS severity5.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in torch.jit.jit_module_from_flatbuffer in PyTorch 2.6.0 allows local users to crash a process via a FlatBuffer module. The upstream reproduction saves a scripted model containing BatchNorm2d, reloads it through the affected function, and segfaults when the loaded model processes input. The public record does not identify the corrupting memory operation; low-privileged local code execution is required, and the demonstrated consequence is process termination.

The record

CVE
CVE-2025-3121
Published
Apr 2, 2025
Updated
Apr 3, 2025
Vendor
Linux Foundation
Product
PyTorch
Classifications
CWE-119, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 2, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Linux Foundation · PyTorchversion=2.6.0

Published CVSS scores

4.8VulDB CNACVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
1.7VulDB CNAAV:L/AC:L/Au:S/C:N/I:N/A:P
3.3VulDB CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
3.3VulDB CNACVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Application or System Exploitation

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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