CVE-2026-98113Network attack vectorHinoki check available

Kernel log flooding via unmapped DACL SIDs

Published Sep 25, 2026 · Updated Sep 25, 2026

Resource exhaustion in Linux ksmbd allows remote authenticated users to flood the kernel log through SMB DACL requests. The DACL SID-mapping error path emits a kernel error for every structurally valid SID that cannot be mapped, without rate limiting. An authenticated SMB session and a share operation carrying a DACL are required; one request can generate hundreds of messages and consume logging resources.

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

Resource exhaustion in Linux ksmbd allows remote authenticated users to flood the kernel log through SMB DACL requests. The DACL SID-mapping error path emits a kernel error for every structurally valid SID that cannot be mapped, without rate limiting. An authenticated SMB session and a share operation carrying a DACL are required; one request can generate hundreds of messages and consume logging resources.

The record

CVE
CVE-2026-98113
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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=5.15
  2. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <13af319c1efec0b45fb5c1b16830eb0888b3fd1e
  3. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <30dbb08777b9a611d7d9193c040f382fbd0e7562
  4. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <54cb2a909996346ac6a8a3beac96c07b3dcba584
  5. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <feca5e70fc963b088377b20879e8cd8237c2fd7d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <13af319c1efec0b45fb5c1b16830eb0888b3fd1e; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <30dbb08777b9a611d7d9193c040f382fbd0e7562; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <54cb2a909996346ac6a8a3beac96c07b3dcba584; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <feca5e70fc963b088377b20879e8cd8237c2fd7d

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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