Ubuntu Security Notice 2112-1 - Vasily Kulikov reported a flaw in the Linux kernel's implementation of ptrace. An unprivileged local user could exploit this flaw to obtain sensitive information from kernel memory. Dave Jones and Vince Weaver reported a flaw in the Linux kernel's perf event subsystem that allows normal users to enable function tracing. An unprivileged local user could exploit this flaw to obtain potentially sensitive information from the kernel. Various other issues were also addressed.
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