ZDI-26-573: Linux Kernel KSMBD Response Header Out-Of-Bounds Read Information Disclosure Vulnerability
A critical information disclosure vulnerability exists in the Linux Kernel KSMBD component, allowing remote attackers to read out-of-bounds memory without authentication. The flaw is due to improper validation in the init_smb2_rsp_hdr function, leading to a read past the end of an allocated buffer. This can disclose sensitive information and potentially be leveraged with other vulnerabilities for arbitrary code execution in kernel context. Only systems with ksmbd enabled are affected. Linux has issued an update to address this issue.
AI Analysis
Technical Summary
The Linux Kernel KSMBD component contains an out-of-bounds read vulnerability in the init_smb2_rsp_hdr function caused by insufficient validation of user-supplied data. This flaw allows remote attackers to disclose sensitive information without authentication on systems where ksmbd is enabled. The vulnerability has a CVSS score of 9.3, indicating critical severity. Additionally, attackers may combine this vulnerability with others to execute arbitrary code within the kernel. Linux has released a patch to fix this vulnerability.
Potential Impact
Remote attackers can disclose sensitive information on affected systems without requiring authentication. The vulnerability affects only systems with the ksmbd service enabled. There is also a potential for attackers to leverage this flaw with other vulnerabilities to achieve arbitrary code execution in kernel context, increasing the risk of full system compromise.
Mitigation Recommendations
Linux has issued an official update to correct this vulnerability. Users and administrators should apply the provided patch or update their Linux Kernel to the fixed version as soon as possible to mitigate the risk. No additional mitigation steps are indicated beyond applying the official fix.
ZDI-26-573: Linux Kernel KSMBD Response Header Out-Of-Bounds Read Information Disclosure Vulnerability
Description
A critical information disclosure vulnerability exists in the Linux Kernel KSMBD component, allowing remote attackers to read out-of-bounds memory without authentication. The flaw is due to improper validation in the init_smb2_rsp_hdr function, leading to a read past the end of an allocated buffer. This can disclose sensitive information and potentially be leveraged with other vulnerabilities for arbitrary code execution in kernel context. Only systems with ksmbd enabled are affected. Linux has issued an update to address this issue.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux Kernel KSMBD component contains an out-of-bounds read vulnerability in the init_smb2_rsp_hdr function caused by insufficient validation of user-supplied data. This flaw allows remote attackers to disclose sensitive information without authentication on systems where ksmbd is enabled. The vulnerability has a CVSS score of 9.3, indicating critical severity. Additionally, attackers may combine this vulnerability with others to execute arbitrary code within the kernel. Linux has released a patch to fix this vulnerability.
Potential Impact
Remote attackers can disclose sensitive information on affected systems without requiring authentication. The vulnerability affects only systems with the ksmbd service enabled. There is also a potential for attackers to leverage this flaw with other vulnerabilities to achieve arbitrary code execution in kernel context, increasing the risk of full system compromise.
Mitigation Recommendations
Linux has issued an official update to correct this vulnerability. Users and administrators should apply the provided patch or update their Linux Kernel to the fixed version as soon as possible to mitigate the risk. No additional mitigation steps are indicated beyond applying the official fix.
Technical Details
- Classification
- {"confidence":0.95,"severitySource":"cvss-text","classifier":"rss-v2"}
- Article Source
- {"url":"http://www.zerodayinitiative.com/advisories/ZDI-26-573/","fetched":true,"fetchedAt":"2026-08-13T20:40:15.044Z","wordCount":206}
Threat ID: 6a7e2cfbbf8831d539c73d1a
Added to database: 08/13/2026, 20:45:47 UTC
Last enriched: 08/13/2026, 20:47:53 UTC
Last updated: 08/13/2026, 23:47:12 UTC
Views: 7
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