CVE-2026-98405Network attack vectorHinoki check available

Kernel-memory overread via unchecked SMB response length

Published Oct 14, 2026 · Updated Oct 14, 2026

Out-of-bounds reads in the Linux SMB client allow remote attackers to trigger reads of adjacent kernel memory via crafted server replies. In parse_posix_sids(), out_len sets sidsbuf_end without validation against the received iov_len, defeating the bounds checks in posix_info_sid_size(). The client must process a malicious server's POSIX SID response; the published evidence establishes an overread, not attacker-visible disclosure or code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds reads in the Linux SMB client allow remote attackers to trigger reads of adjacent kernel memory via crafted server replies. In parse_posix_sids(), out_len sets sidsbuf_end without validation against the received iov_len, defeating the bounds checks in posix_info_sid_size(). The client must process a malicious server's POSIX SID response; the published evidence establishes an overread, not attacker-visible disclosure or code execution.

The record

CVE
CVE-2026-98405
Published
Oct 14, 2026
Updated
Oct 14, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 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=6.6.32 <6.12.112
  2. Affected versionversion=6.6.32 <6.18.54
  3. Affected versionversion=6.6.32 <6.6.158
  4. Affected versionversion=6.6.32 <7.2.8
  5. Affected versionversion=6.6.32 <7.3-rc4
  6. Affected versionversion=a90f37e3d7acfd9824f162830583bbf7846fe252 <2f8ed71aaaba3bc8b19cd9930cc62e63e142b299
  7. Affected versionversion=a90f37e3d7acfd9824f162830583bbf7846fe252 <b09d092eb24ad0110f16a9b7c1ed5d2a0c1733dc
  8. Affected versionversion=a90f37e3d7acfd9824f162830583bbf7846fe252 <b862996e5105be1293da9cdc85da77b76021c3bd
  9. Affected versionversion=a90f37e3d7acfd9824f162830583bbf7846fe252 <d91b9a3b2b38e5ac1b51e9e5b23fe53ad7b49644
  10. Affected versionversion=a90f37e3d7acfd9824f162830583bbf7846fe252 <eac6917a42899aad0617bbf04798c5dd946a1fe5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.6.32 <6.12.112; version=6.6.32 <6.18.54; version=6.6.32 <6.6.158; version=6.6.32 <7.2.8; version=6.6.32 <7.3-rc4; version=a90f37e3d7acfd9824f162830583bbf7846fe252 <2f8ed71aaaba3bc8b19cd9930cc62e63e142b299; version=a90f37e3d7acfd9824f162830583bbf7846fe252 <b09d092eb24ad0110f16a9b7c1ed5d2a0c1733dc; version=a90f37e3d7acfd9824f162830583bbf7846fe252 <b862996e5105be1293da9cdc85da77b76021c3bd; version=a90f37e3d7acfd9824f162830583bbf7846fe252 <d91b9a3b2b38e5ac1b51e9e5b23fe53ad7b49644; version=a90f37e3d7acfd9824f162830583bbf7846fe252 <eac6917a42899aad0617bbf04798c5dd946a1fe5

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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