The OSI networking kernel (sys/netiso) in NetBSD 1.6.1 and earlier does not use a BSD-required "PKTHDR" mbuf when sending certain error responses to the sender of an OSI packet, which allows remote attackers to cause a denial of service (kernel panic or crash) via certain OSI packets.
| Software | From | Fixed in |
|---|---|---|
| netbsd / netbsd | 1.5.3 | 1.5.3.x |
| netbsd / netbsd | 1.6 | 1.6.x |
| netbsd / netbsd | 1.5 | 1.5.x |
| netbsd / netbsd | 1.6.1 | 1.6.1.x |
| netbsd / netbsd | 1.5.1 | 1.5.1.x |
| netbsd / netbsd | 1.5.2 | 1.5.2.x |