Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks. For the stable distribution (buster), these problems have been fixed in version 4.19.194-3. We recommend that you upgrade your linux packages. For the detailed security status of linux please refer to its security tracker page at: https://security-tracker.org/tracker/linux. Further information about the updates can be found at: http://www.debian.org/.”]
Source: https://lists.debian.org/debian-security-announce/2021/msg00124.html