CVE-2025-40222

Service interruption via RSCI register misindexing

Published Dec 4, 2025 · Updated May 11, 2026

Out-of-bounds access in Linux kernel 6.17 through 6.17.5 allows local users to interrupt service through an RSCI FIFO overrun. sci_handle_fifo_overrun passes RSCI's CSR offset 0x48 to sci_getreg as a regs-array index, reading beyond the 20-entry rsci_port_params table. The path requires an RSCI-backed Renesas system and an overrun interrupt; the demonstrated consequence is an invalid-register warning in kernel context.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in Linux kernel 6.17 through 6.17.5 allows local users to interrupt service through an RSCI FIFO overrun. sci_handle_fifo_overrun passes RSCI's CSR offset 0x48 to sci_getreg as a regs-array index, reading beyond the 20-entry rsci_port_params table. The path requires an RSCI-backed Renesas system and an overrun interrupt; the demonstrated consequence is an invalid-register warning in kernel context.

The record

CVE
CVE-2025-40222
Published
Dec 4, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 4, 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=0666e3fe95ab55c295984f2f51277ec27d3f190c <2ec9bbd09a6cdf5b8c726be34f29630faf585d07
  2. Affected versionversion=0666e3fe95ab55c295984f2f51277ec27d3f190c <ef8fef45c74b5a0059488fda2df65fa133f7d7d0
  3. Affected versionversion=6.17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0666e3fe95ab55c295984f2f51277ec27d3f190c <2ec9bbd09a6cdf5b8c726be34f29630faf585d07; version=0666e3fe95ab55c295984f2f51277ec27d3f190c <ef8fef45c74b5a0059488fda2df65fa133f7d7d0; version=6.17

Published CVSS scores

5.5SUSECVSS: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

No sourced classifications are available.

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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