CVE-2025-21774

Kernel crash via reversed allocation check

Published Feb 27, 2025 · Updated May 11, 2026

NULL pointer dereference in the Rockchip CAN-FD driver in Linux 6.12 allows local users to crash the kernel during RX FIFO overflow. When error-packet allocation fails, rkcanfd_handle_rx_fifo_overflow_int reverses its NULL check and dereferences the unallocated frame pointer. Exploitation requires local low-privileged access on a system using the Rockchip CAN-FD controller and an RX FIFO overflow under memory pressure.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Rockchip CAN-FD driver in Linux 6.12 allows local users to crash the kernel during RX FIFO overflow. When error-packet allocation fails, rkcanfd_handle_rx_fifo_overflow_int reverses its NULL check and dereferences the unallocated frame pointer. Exploitation requires local low-privileged access on a system using the Rockchip CAN-FD controller and an RX FIFO overflow under memory pressure.

The record

CVE
CVE-2025-21774
Published
Feb 27, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 27, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record 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=6.12
  2. Affected versionversion=ff60bfbaf67f219c634cfe89a52250efe8e600d0 <118fb35681bd2c0d2afa22f7be0ef94bb4d06849
  3. Affected versionversion=ff60bfbaf67f219c634cfe89a52250efe8e600d0 <946750e7865df2e70045071051abf768785dd570
  4. Affected versionversion=ff60bfbaf67f219c634cfe89a52250efe8e600d0 <f7f0adfe64de08803990dc4cbecd2849c04e314a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.12; version=ff60bfbaf67f219c634cfe89a52250efe8e600d0 <118fb35681bd2c0d2afa22f7be0ef94bb4d06849; version=ff60bfbaf67f219c634cfe89a52250efe8e600d0 <946750e7865df2e70045071051abf768785dd570; version=ff60bfbaf67f219c634cfe89a52250efe8e600d0 <f7f0adfe64de08803990dc4cbecd2849c04e314a

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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 exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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