CVE-2026-98167Network attack vectorHinoki check available

Out-of-bounds read via compound SMB length confusion

Published Oct 6, 2026 · Updated Oct 6, 2026

Out-of-bounds read in the Linux SMB client allows remote attackers controlling an SMB server to trigger a kernel read via encrypted responses. In receive_encrypted_standard(), server->total_read retains the full decrypted frame size, so smb2_check_message() validates a truncated non-last sub-PDU against the compound frame and smb2_get_data_area_len() reads past its bounds. The client must process a compound encrypted response from a connected SMB server; the published record does not establish data disclosure or code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.22%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds read in the Linux SMB client allows remote attackers controlling an SMB server to trigger a kernel read via encrypted responses. In receive_encrypted_standard(), server->total_read retains the full decrypted frame size, so smb2_check_message() validates a truncated non-last sub-PDU against the compound frame and smb2_get_data_area_len() reads past its bounds. The client must process a compound encrypted response from a connected SMB server; the published record does not establish data disclosure or code execution.

The record

CVE
CVE-2026-98167
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
network
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=4.19
  2. Affected versionversion=b24df3e30cbf48255db866720fb71f14bf9d2f39 <282b72f9a7ef31296c48366db4128882999cc048
  3. Affected versionversion=b24df3e30cbf48255db866720fb71f14bf9d2f39 <8703539d22fdbc13dd2db090ee199c3a427b8ea0
  4. Affected versionversion=b24df3e30cbf48255db866720fb71f14bf9d2f39 <a46eb242e9eef3a3897d166748b23303c516e870
  5. Affected versionversion=b24df3e30cbf48255db866720fb71f14bf9d2f39 <e78fc1d240b27349b45a0f1c3e3c2c401d7e230d
  6. Affected versionversion=b24df3e30cbf48255db866720fb71f14bf9d2f39 <ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3
  7. Affected versionversion=b24df3e30cbf48255db866720fb71f14bf9d2f39 <f73726b83e4756fdaa099e1bc1143293bd57ad79

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.19; version=b24df3e30cbf48255db866720fb71f14bf9d2f39 <282b72f9a7ef31296c48366db4128882999cc048; version=b24df3e30cbf48255db866720fb71f14bf9d2f39 <8703539d22fdbc13dd2db090ee199c3a427b8ea0; version=b24df3e30cbf48255db866720fb71f14bf9d2f39 <a46eb242e9eef3a3897d166748b23303c516e870; version=b24df3e30cbf48255db866720fb71f14bf9d2f39 <e78fc1d240b27349b45a0f1c3e3c2c401d7e230d; version=b24df3e30cbf48255db866720fb71f14bf9d2f39 <ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3; version=b24df3e30cbf48255db866720fb71f14bf9d2f39 <f73726b83e4756fdaa099e1bc1143293bd57ad79

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)
Vectornetwork
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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