CVE-2025-38425

Local kernel memory corruption via unchecked SMBus length

Published Jul 25, 2025 · Updated Aug 5, 2026

Heap overflow in the Tegra I2C driver in affected Linux versions allows local users to corrupt kernel memory via an SMBus block read. The block-read path trusts a device-supplied length and continues when it is zero or exceeds the allowed maximum, permitting up to 255 bytes in a 34-byte slab object. A local account with access to an I2C device node can leak adjacent heap data, corrupt neighboring objects, panic the kernel, or stall the controller.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap overflow in the Tegra I2C driver in affected Linux versions allows local users to corrupt kernel memory via an SMBus block read. The block-read path trusts a device-supplied length and continues when it is zero or exceeds the allowed maximum, permitting up to 255 bytes in a 34-byte slab object. A local account with access to an I2C device node can leak adjacent heap data, corrupt neighboring objects, panic the kernel, or stall the controller.

The record

CVE
CVE-2025-38425
Published
Jul 25, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record 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?

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

  1. Affected versionversion=5.18
  2. Affected versionversion=d7583c8a57485da19feb6dd85573763a8c5ec1d1 <3f03f77ce688d02da284174e1884b6065d6159bd
  3. Affected versionversion=d7583c8a57485da19feb6dd85573763a8c5ec1d1 <75a864f21ceeb8c1e8ce1b7589174fec2c3a039e
  4. Affected versionversion=d7583c8a57485da19feb6dd85573763a8c5ec1d1 <a6e04f05ce0b070ab39d5775580e65c7d943da0b
  5. Affected versionversion=d7583c8a57485da19feb6dd85573763a8c5ec1d1 <be5f6a65509cd5675362f15eb0440fb28b0f9d64
  6. Affected versionversion=d7583c8a57485da19feb6dd85573763a8c5ec1d1 <c39d1a9ae4ad66afcecab124d7789722bfe909fa

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.18; version=d7583c8a57485da19feb6dd85573763a8c5ec1d1 <3f03f77ce688d02da284174e1884b6065d6159bd; version=d7583c8a57485da19feb6dd85573763a8c5ec1d1 <75a864f21ceeb8c1e8ce1b7589174fec2c3a039e; version=d7583c8a57485da19feb6dd85573763a8c5ec1d1 <a6e04f05ce0b070ab39d5775580e65c7d943da0b; version=d7583c8a57485da19feb6dd85573763a8c5ec1d1 <be5f6a65509cd5675362f15eb0440fb28b0f9d64; version=d7583c8a57485da19feb6dd85573763a8c5ec1d1 <c39d1a9ae4ad66afcecab124d7789722bfe909fa

Published CVSS scores

7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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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