SB20260928377 - Integer overflow in Linux kernel smb client

Description

This security bulletin contains information about 1 vulnerability.

1) Integer overflow (CVE-ID: CVE-2026-97559)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to corrupt a discretionary access control list (DACL).

The vulnerability exists due to an integer overflow in the SMB client DACL rewrite functions when rewritten access control entries cause a DACL to exceed 64K. A local user can trigger a DACL rewrite that exceeds 64K to corrupt a DACL.

The affected allocation covers the worst-case expansion, so writes remain within the allocated buffer.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2ef532a01f44687f5b95001e88247cf05bff9892
• https://git.kernel.org/stable/c/d05045177a855386bca5e1909e08d06290e6e3b3
• https://git.kernel.org/stable/c/ee13d687d06a6fbb2008625dd560c654231b28e0