In the Linux kernel before 2.6.20, there is an off-by-one bug in net/netlabel/netlabel_cipso_v4.c where it is possible to overflow the doi_def->tags[] array.
https://support.f5.com/csp/article/K05342145?utm_source=f5support&%3Butm_medium=RSS
https://support.f5.com/csp/article/K05342145
https://github.com/torvalds/linux/commit/2a2f11c227bdf292b3a2900ad04139d301b56ac4