net/can/bcm.c in the Linux kernel through 5.12.10 allows local users to obtain sensitive information from kernel stack memory because parts of a data structure are uninitialized.
www.openwall.com/lists/oss-security/2021/06/15/1
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5e87ddbe3942e27e939bdc02deb8579b0cbd8ecc
lists.debian.org/debian-lts-announce/2021/07/msg00014.html
lists.debian.org/debian-lts-announce/2021/07/msg00015.html
lists.debian.org/debian-lts-announce/2021/07/msg00016.html
lore.kernel.org/netdev/trinity-87eaea25-2a7d-4aa9-92a5-269b822e5d95-1623609211076%403c-app-gmx-bs04/T/
www.debian.org/security/2021/dsa-4941