CVE-2025-39794

Kernel crash via normal memcpy to Tegra IRAM

Published Sep 12, 2025 · Updated Sep 12, 2025

Improper I/O memory access in the ARM Tegra reset path in Linux allows local users to crash a KASAN-enabled kernel during reset setup. The tegra_cpu_reset_handler_enable function passes the I/O-mapped IRAM destination to normal memcpy, causing KASAN to apply ordinary-memory boundary checks instead of using memcpy_toio. Exploitation requires low-privileged local access to an ARM Tegra system built with KASAN, and the documented consequence is a kernel crash.

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

What happened

Improper I/O memory access in the ARM Tegra reset path in Linux allows local users to crash a KASAN-enabled kernel during reset setup. The tegra_cpu_reset_handler_enable function passes the I/O-mapped IRAM destination to normal memcpy, causing KASAN to apply ordinary-memory boundary checks instead of using memcpy_toio. Exploitation requires low-privileged local access to an ARM Tegra system built with KASAN, and the documented consequence is a kernel crash.

The record

CVE
CVE-2025-39794
Published
Sep 12, 2025
Updated
Sep 12, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 12, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 12, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2499b0ac908eefbb8a217aae609b7a5b5174f330
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <30ef45b89a5961cdecf907ecff1ef3374d1de510
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <387435f4833f97aabfd74434ee526e31e8a626ea
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <398e67e0f5ae04b29bcc9cbf342e339fe9d3f6f1
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <46b3a7a3a36d5833f14914d1b95c69d28c6a76d6
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <75a3bdfeed2f129a2c7d9fd7779382b78e35b014
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <96d6605bf0561d6e568b1dd9265a0f73b5b94f51
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9b0b3b5e5cae95e09bf0ae4a9bcb58d9b6d57f87
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b28c1a14accc79ead1e87bbdae53309da60be1e7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2499b0ac908eefbb8a217aae609b7a5b5174f330; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <30ef45b89a5961cdecf907ecff1ef3374d1de510; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <387435f4833f97aabfd74434ee526e31e8a626ea; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <398e67e0f5ae04b29bcc9cbf342e339fe9d3f6f1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <46b3a7a3a36d5833f14914d1b95c69d28c6a76d6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <75a3bdfeed2f129a2c7d9fd7779382b78e35b014; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <96d6605bf0561d6e568b1dd9265a0f73b5b94f51; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9b0b3b5e5cae95e09bf0ae4a9bcb58d9b6d57f87; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b28c1a14accc79ead1e87bbdae53309da60be1e7

Published CVSS scores

5.5NIST NVDCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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