Heap-based buffer overflow in Linux kernel - CVE-2026-99110
Published: October 29, 2026
Vulnerability identifier: #VU158481
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99110
CWE-ID: CWE-122
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service through kernel heap corruption.
The vulnerability exists due to a heap-based buffer overflow in the Linux kernel SMB client's cifs_do_set_acl() function when converting POSIX ACLs to the CIFS wire format. A local user can supply an ACL that passes validation based on the smaller extended-attribute representation but exceeds the destination buffer after conversion to corrupt kernel heap memory and potentially cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-99110
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3