CVE-2026-98171Network attack vectorHinoki check available

Invalid client memory access via malformed SMB responses

Published Oct 6, 2026 · Updated Oct 6, 2026

Linux SMB client flaws allow remote attackers controlling an SMB server to trigger invalid memory access via encrypted compound responses. In receive_encrypted_standard(), a stale next_buffer survives transfer to server->bigbuf, while NextCommand validation uses the pre-decryption length and permits short or overflowing offsets. The client must process an encrypted compound response from a malicious or compromised SMB server; the published fix identifies use-after-free and out-of-bounds reads, not code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.51%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Linux SMB client flaws allow remote attackers controlling an SMB server to trigger invalid memory access via encrypted compound responses. In receive_encrypted_standard(), a stale next_buffer survives transfer to server->bigbuf, while NextCommand validation uses the pre-decryption length and permits short or overflowing offsets. The client must process an encrypted compound response from a malicious or compromised SMB server; the published fix identifies use-after-free and out-of-bounds reads, not code execution.

The record

CVE
CVE-2026-98171
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 <05762c5bc1cfdcac36747994fde2c04387a457f1
  3. Affected versionversion=b24df3e30cbf48255db866720fb71f14bf9d2f39 <491e33144dee872cffda207f6fcb09260728f803
  4. Affected versionversion=b24df3e30cbf48255db866720fb71f14bf9d2f39 <72eaef1f37a3b6bec11c342736834dc3707be3e4
  5. Affected versionversion=b24df3e30cbf48255db866720fb71f14bf9d2f39 <858d5ac22cb889266993e7670f9f0c4f4aeedd78
  6. Affected versionversion=b24df3e30cbf48255db866720fb71f14bf9d2f39 <8749946579708ea0d339034bb7f423a67dbe89cf
  7. Affected versionversion=b24df3e30cbf48255db866720fb71f14bf9d2f39 <96c436e4b010711452b2872558938f4ef276492a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.19; version=b24df3e30cbf48255db866720fb71f14bf9d2f39 <05762c5bc1cfdcac36747994fde2c04387a457f1; version=b24df3e30cbf48255db866720fb71f14bf9d2f39 <491e33144dee872cffda207f6fcb09260728f803; version=b24df3e30cbf48255db866720fb71f14bf9d2f39 <72eaef1f37a3b6bec11c342736834dc3707be3e4; version=b24df3e30cbf48255db866720fb71f14bf9d2f39 <858d5ac22cb889266993e7670f9f0c4f4aeedd78; version=b24df3e30cbf48255db866720fb71f14bf9d2f39 <8749946579708ea0d339034bb7f423a67dbe89cf; version=b24df3e30cbf48255db866720fb71f14bf9d2f39 <96c436e4b010711452b2872558938f4ef276492a

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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