CVE-2026-84543

A remote kernel vulnerability exists in the macOS SMB filesystem (smbfs.kext ) caused by an out-of-bounds access issue. During an SMB1 mount , the _smbfs_unix_whoami parser fails to clear the ntwrk_cnt_gid count when an oversized allocation fails, leaving a nonzero count paired with a NULL pointe...

CVE-2026-84515

Apple has addressed an out-of-bounds write vulnerability in macOS affecting versions prior to Golden Gate 27 , Sequoia 15.8 , and Tahoe 26.7 . The root cause involves insufficient bounds checking, which could allow an attacker connecting to a malicious SMB server to trigger kernel memory corrupti...

CVE-2026-84536

An integer underflow was addressed with improved input validation. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Connecting to a malicious SMB server may lead to unexpected system termination...

Vulnerability Spotlight: Information disclosure vulnerability in macOS SMB server

Aleksandar Nikolic of Cisco Talos discovered this vulnerability. Blog by Jon Munshaw. Cisco Talos recently discovered an exploitable integer overflow vulnerability in Apple macOS’ SMB server that could lead to information disclosure. Server Message Block SMB is a network... This is only the...