CVE-2026-28825

Vulnerability

Overview

CVE-2026-28825 is an out-of-bounds write in the macOS kernel's SMB filesystem driver (smbfs.kext). The issue stems from insufficient bounds checking when handling certain SMB2 protocol messages, leading to a heap-based buffer overflow. Apple addressed the vulnerability by improving bounds checking in the affected code path. [1][4]

Exploitation

An attacker would need to run a malicious application on the target system to trigger the out-of-bounds write. No special network privileges are required; the attack vector is local. The vulnerability can be exploited without user interaction beyond launching the app. [4]

Impact

Successful exploitation allows an attacker to modify protected parts of the file system, potentially bypassing security mechanisms such as System Integrity Protection (SIP). This could lead to privilege escalation or persistent compromise of the system. [1][4]

Mitigation

Apple has released patches are available in macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, and macOS Tahoe 26.4. Apple does not disclose any workarounds for this issue. Users should update to the latest versions to protect against exploitation. [1][2][3]