Out-of-bounds reads via malformed share configurations
Published Sep 16, 2026 · Updated Sep 16, 2026
Out-of-bounds reads in Linux ksmbd allow attackers to access memory past share-configuration IPC payloads through malformed responses. The transport and share-config parsers consumed variable-length fields without first validating the payload size, parsed veto lists without an effective bound, and omitted the separator byte when calculating the path length. Exploitation requires the ksmbd share-configuration response path; public material does not establish an externally visible consequence or whether a remote SMB client can create the malformed response.
Summary
What happened
Out-of-bounds reads in Linux ksmbd allow attackers to access memory past share-configuration IPC payloads through malformed responses. The transport and share-config parsers consumed variable-length fields without first validating the payload size, parsed veto lists without an effective bound, and omitted the separator byte when calculating the path length. Exploitation requires the ksmbd share-configuration response path; public material does not establish an externally visible consequence or whether a remote SMB client can create the malformed response.
The record
- CVE
- CVE-2026-89792
- Published
- Sep 16, 2026
- Updated
- Sep 16, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 16, 2026CVE publishedPublication date reported by the CVE source.
- Sep 16, 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.
- Affected versionversion=5.15.157 <5.16
- Affected versionversion=51a6c2af9d20203ddeeaf73314ba8854b38d01bd
- Affected versionversion=6.1.85 <6.2
- Affected versionversion=6.6.26 <6.7
- Affected versionversion=6.8.5 <6.9
- Affected versionversion=6.9
- Affected versionversion=76af689a45aa44714b46d1a7de4ffdf851ded896
- Affected versionversion=88b7f1143b15b29cccb8392b4f38e75b7bb3e300
- Affected versionversion=a637fabac554270a851033f5ab402ecb90bc479c
- Affected versionversion=a677ebd8ca2f2632ccdecbad7b87641274e15aac <61a8d06600c8c397f9a7e01940479d4c94a82f5f
- Affected versionversion=a677ebd8ca2f2632ccdecbad7b87641274e15aac <f25e93768fcc5d8287e50b1ec52a42e4c276df34
What conditions does exploitation require?
What is affected?
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.
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
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo