CVE-2026-90170Hinoki check available

Out-of-bounds read via undersized daemon IPC replies

Published Sep 17, 2026 · Updated Sep 17, 2026

Out-of-bounds reading in Linux ksmbd allows local users to trigger kernel memory reads via undersized daemon IPC responses. In fs/smb/server/transport_ipc.c, ipc_validate_msg() reads response length fields before checking that the allocated buffer contains their structures. Triggering requires a buggy or compromised ksmbd.mountd daemon, not a remote SMB client; the demonstrated consequence is a kernel out-of-bounds read.

CVSS severity2.3
Low
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds reading in Linux ksmbd allows local users to trigger kernel memory reads via undersized daemon IPC responses. In fs/smb/server/transport_ipc.c, ipc_validate_msg() reads response length fields before checking that the allocated buffer contains their structures. Triggering requires a buggy or compromised ksmbd.mountd daemon, not a remote SMB client; the demonstrated consequence is a kernel out-of-bounds read.

The record

CVE
CVE-2026-90170
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=299db777ea0cfa5c407e41b045c24a14c034c27b <0aa8f94bfd4d818284c8a7ce0040d40ca1ec3595
  2. Affected versionversion=6.12.84 <6.12.110
  3. Affected versionversion=6.18.25 <6.18.52
  4. Affected versionversion=6.6.141 <6.6.157
  5. Affected versionversion=7.0.2 <7.1
  6. Affected versionversion=7.1
  7. Affected versionversion=7dd0c858e1909769a4c91842724315ee74f1a5f1 <398cba4b646a6c08ff3d79e6b1e70e5ddae8a065
  8. Affected versionversion=99c631d0366c1eab8fb188fe66425f4581ebdde4
  9. Affected versionversion=bf396208418371174869baba9434535cd3288e80 <17b7d1a2b4d5473df5dca8c9a07d65021806c23a
  10. Affected versionversion=d6a6aa81eac2c9bff66dc6e191179cb69a14426b <c494fcf8e89e3c970e13d78ebe62bf5d8f2b1c52
  11. Affected versionversion=d6a6aa81eac2c9bff66dc6e191179cb69a14426b <e9b33376bd07bca4175f7bcc2d6034ef250f8181

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=299db777ea0cfa5c407e41b045c24a14c034c27b <0aa8f94bfd4d818284c8a7ce0040d40ca1ec3595; version=6.12.84 <6.12.110; version=6.18.25 <6.18.52; version=6.6.141 <6.6.157; version=7.0.2 <7.1; version=7.1; version=7dd0c858e1909769a4c91842724315ee74f1a5f1 <398cba4b646a6c08ff3d79e6b1e70e5ddae8a065; version=99c631d0366c1eab8fb188fe66425f4581ebdde4; version=bf396208418371174869baba9434535cd3288e80 <17b7d1a2b4d5473df5dca8c9a07d65021806c23a; version=d6a6aa81eac2c9bff66dc6e191179cb69a14426b <c494fcf8e89e3c970e13d78ebe62bf5d8f2b1c52; version=d6a6aa81eac2c9bff66dc6e191179cb69a14426b <e9b33376bd07bca4175f7bcc2d6034ef250f8181

Published CVSS scores

2.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

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.

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No observations available

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