Out-of-bounds read in Linux kernel - CVE-2026-68097

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU142222

Out-of-bounds read in Linux kernel - CVE-2026-68097

Published: August 12, 2026


Vulnerability identifier: #VU142222
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-68097
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to an out-of-bounds read in set_ntacl_dacl() in ksmbd when processing crafted ACE data in NT ACLs. A remote user can supply an undersized ACE with a SID sub-authority count that exceeds the declared ACE size to cause a denial of service.

The out-of-bounds access occurs later during the POSIX ACL deduplication walk after the malformed ACE has been copied.


Affected software

Linux kernel
Ubuntu
linux-gcp-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)

How to mitigate CVE-2026-68097

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1

External References

Related Security Bulletins