CVE-2026-98204

Kernel buffer over-read via incorrect SMBus chunk length

Published Oct 6, 2026 · Updated Oct 6, 2026

Out-of-bounds read in the Linux kernel RMI SMBus input driver allows attackers to trigger a buffer over-read during SMBus writes. In rmi_smb_write_block(), the loop sizes the final block from the original write length rather than the remaining length, so smb_block_write() reads beyond the advanced input buffer. The path requires an RMI SMBus device and a write ending in a partial block; the public record documents neither an attacker-accessible trigger nor resulting data exposure.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux kernel RMI SMBus input driver allows attackers to trigger a buffer over-read during SMBus writes. In rmi_smb_write_block(), the loop sizes the final block from the original write length rather than the remaining length, so smb_block_write() reads beyond the advanced input buffer. The path requires an RMI SMBus device and a write ending in a partial block; the public record documents neither an attacker-accessible trigger nor resulting data exposure.

The record

CVE
CVE-2026-98204
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 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=4.10
  2. Affected versionversion=82264d0cf7aef2247563c031ff2ab96579d5d0cc <29fbcf5834f0a7f74bfd017c07da2411b35a4e2a
  3. Affected versionversion=82264d0cf7aef2247563c031ff2ab96579d5d0cc <50dd585bee7669eb165e5defcc35d17f3822cfbb
  4. Affected versionversion=82264d0cf7aef2247563c031ff2ab96579d5d0cc <51cfe54f815ae175c7d1126b983d4d7c89715004
  5. Affected versionversion=82264d0cf7aef2247563c031ff2ab96579d5d0cc <7c800af1c6030a5f27d46ce7d6d5d75f9c1efaf8
  6. Affected versionversion=82264d0cf7aef2247563c031ff2ab96579d5d0cc <9f0ce5e162eed8b68345abe839c59768bc60f99a
  7. Affected versionversion=82264d0cf7aef2247563c031ff2ab96579d5d0cc <d01337c0892d1509500c727edf81380777c2dd0f
  8. Affected versionversion=82264d0cf7aef2247563c031ff2ab96579d5d0cc <dc05ec97b8299e48e31367a9bc412c7e9c0e2b42
  9. Affected versionversion=82264d0cf7aef2247563c031ff2ab96579d5d0cc <e022538e13dd1c82af5ec25ac28f12ca0ab26160

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.10; version=82264d0cf7aef2247563c031ff2ab96579d5d0cc <29fbcf5834f0a7f74bfd017c07da2411b35a4e2a; version=82264d0cf7aef2247563c031ff2ab96579d5d0cc <50dd585bee7669eb165e5defcc35d17f3822cfbb; version=82264d0cf7aef2247563c031ff2ab96579d5d0cc <51cfe54f815ae175c7d1126b983d4d7c89715004; version=82264d0cf7aef2247563c031ff2ab96579d5d0cc <7c800af1c6030a5f27d46ce7d6d5d75f9c1efaf8; version=82264d0cf7aef2247563c031ff2ab96579d5d0cc <9f0ce5e162eed8b68345abe839c59768bc60f99a; version=82264d0cf7aef2247563c031ff2ab96579d5d0cc <d01337c0892d1509500c727edf81380777c2dd0f; version=82264d0cf7aef2247563c031ff2ab96579d5d0cc <dc05ec97b8299e48e31367a9bc412c7e9c0e2b42; version=82264d0cf7aef2247563c031ff2ab96579d5d0cc <e022538e13dd1c82af5ec25ac28f12ca0ab26160

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
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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