The Linux kernel allows remote attackers to execute arbitrary code via UDP traffic that triggers an unsafe second checksum calculation during execution of a recv system call with the MSG_PEEK flag. This may create a kernel panic or memory corruption leading to privilege escalation.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=197c949e7798fbf28cfadc69d9ca0c2abbf93191

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