Response-data disclosure via uncleared compound-response fields
Published Oct 28, 2026 · Updated Oct 28, 2026
Information disclosure in Linux ksmbd allows remote attackers to read withheld response data through compound SMB requests. The smb2_get_info_filesystem() function returns a 64-byte FS_OBJECT_ID_INFORMATION structure without clearing fields that overlap a preceding failed command's response. An enabled ksmbd server and a compound sequence containing a response written before failure are required; disclosure reaches up to 31 bytes of withheld response data, including access-denied responses, rather than arbitrary kernel memory.
Summary
What happened
Information disclosure in Linux ksmbd allows remote attackers to read withheld response data through compound SMB requests. The smb2_get_info_filesystem() function returns a 64-byte FS_OBJECT_ID_INFORMATION structure without clearing fields that overlap a preceding failed command's response. An enabled ksmbd server and a compound sequence containing a response written before failure are required; disclosure reaches up to 31 bytes of withheld response data, including access-denied responses, rather than arbitrary kernel memory.
The record
- CVE
- CVE-2026-99113
- Published
- Oct 28, 2026
- Updated
- Oct 28, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- network
- Privileges
- Unavailable
Timeline
How it unfolded
- Oct 28, 2026CVE publishedPublication date reported by the CVE source.
- Oct 28, 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.
- Affected versionversion=5.15
- Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <015fffa48e96ca8d73a627445341ccff86b02251
- Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <399aa12450a61a5c73dc77e73f069ece9687c95d
- Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <898cb4f2e12a5ddea1b2d821cc642c3100f46da7
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
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Technologies
Your stack
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Your stack
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