kernel is vulnerable to privilege escalation. A use-after-free in cipso_v4_genopt
in net/ipv4/cipso_ipv4.c
due to the CIPSO and CALIPSO refcounting for the DOI definitions are mishandled, leading to writing of an arbitrary value.
cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14
cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1165affd484889d4986cf3b724318935a0b120d8
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad5d07f4a9cd671233ae20983848874731102c08
git.launchpad.net/ubuntu-cve-tracker/tree/active/CVE-2021-33033
sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genopt
syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701e