Integer overflow in Linux kernel - CVE-2026-97559
Published: September 28, 2026
Vulnerability identifier: #VU152648
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-97559
CWE-ID: CWE-190
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-97559
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3