DEBIAN-CVE-2026-99110: Debian/linux vulnerability

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix heap overflow in cifsdosetacl() cifssetacl() validates ACL size using posixaclxattrsize(): 4 + (count 8) // 4-byte header + 8 bytes per ACE cifsdosetacl() then calls posixacltocifs() to write the CIFS wire format into the same buffer: 6 + (count 10) // 6-byte header + 10 bytes per ACE An ACL that passes the xattr-based check in cifssetacl() can overflow the heap when posixacltocifs() writes the larger CIFS format. Validate the CIFS format size against the remaining buffer space and USHRTMAX before converting--datacount is u16, so sizes above USHRTMAX truncate the on-wire packet length, causing the server to apply a partial ACL. Replace MaxDataCount = 1000 with min(CIFSMaxBufSize, USHRTMAX).