CVE-2025-39987

Kernel memory corruption via unchecked CAN frame length

Published Oct 15, 2025 · Updated Oct 15, 2025

Buffer overflow in the Linux kernel allows local users to corrupt kernel memory by sending crafted CAN XL frames to an HI-3110 interface. The hi3110_hard_start_xmit path misreads CAN XL flags as frame->len, and hi3110_hw_tx copies that unchecked length into a 14-byte buffer. Exploitation requires local CAP_NET_RAW access and an SPI-attached HI-3110 controller; it enables kernel data disclosure, privilege escalation, or a panic.

CVSS severity7.8
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in the Linux kernel allows local users to corrupt kernel memory by sending crafted CAN XL frames to an HI-3110 interface. The hi3110_hard_start_xmit path misreads CAN XL flags as frame->len, and hi3110_hw_tx copies that unchecked length into a 14-byte buffer. Exploitation requires local CAP_NET_RAW access and an SPI-attached HI-3110 controller; it enables kernel data disclosure, privilege escalation, or a panic.

The record

CVE
CVE-2025-39987
Published
Oct 15, 2025
Updated
Oct 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 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=4.12
  2. Affected versionversion=57e83fb9b7468c75cb65cde1d23043553c346c6d <57d332ce8c921d0e340650470bb0c1d707f216ee
  3. Affected versionversion=57e83fb9b7468c75cb65cde1d23043553c346c6d <7ab85762274c0fa997f0ef9a2307b2001aae43c4
  4. Affected versionversion=57e83fb9b7468c75cb65cde1d23043553c346c6d <8f351db6b2367991f0736b2cff082f5de4872113
  5. Affected versionversion=57e83fb9b7468c75cb65cde1d23043553c346c6d <ac1c7656fa717f29fac3ea073af63f0b9919ec9a
  6. Affected versionversion=57e83fb9b7468c75cb65cde1d23043553c346c6d <be1b25005fd0f9d4e78bec6695711ef87ee33398
  7. Affected versionversion=57e83fb9b7468c75cb65cde1d23043553c346c6d <def814b4ba31b563584061d6895d5ff447d5bc14
  8. Affected versionversion=57e83fb9b7468c75cb65cde1d23043553c346c6d <e77fdf9e33a83a08f04ab0cb68c19ddb365a622f
  9. Affected versionversion=57e83fb9b7468c75cb65cde1d23043553c346c6d <f2c247e9581024d8b3dd44cbe086bf2bebbef42c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.12; version=57e83fb9b7468c75cb65cde1d23043553c346c6d <57d332ce8c921d0e340650470bb0c1d707f216ee; version=57e83fb9b7468c75cb65cde1d23043553c346c6d <7ab85762274c0fa997f0ef9a2307b2001aae43c4; version=57e83fb9b7468c75cb65cde1d23043553c346c6d <8f351db6b2367991f0736b2cff082f5de4872113; version=57e83fb9b7468c75cb65cde1d23043553c346c6d <ac1c7656fa717f29fac3ea073af63f0b9919ec9a; version=57e83fb9b7468c75cb65cde1d23043553c346c6d <be1b25005fd0f9d4e78bec6695711ef87ee33398; version=57e83fb9b7468c75cb65cde1d23043553c346c6d <def814b4ba31b563584061d6895d5ff447d5bc14; version=57e83fb9b7468c75cb65cde1d23043553c346c6d <e77fdf9e33a83a08f04ab0cb68c19ddb365a622f; version=57e83fb9b7468c75cb65cde1d23043553c346c6d <f2c247e9581024d8b3dd44cbe086bf2bebbef42c

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8LinuxCVSS: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.

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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

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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