Privilege Escalation via User Namespace and Ptrace System Call in Linux Kernel

CVE-2015-8709 · MEDIUM Severity

AV:L/AC:M/AU:N/C:C/I:C/A:C

kernel/ptrace.c in the Linux kernel through 4.4.1 mishandles uid and gid mappings, which allows local users to gain privileges by establishing a user namespace, waiting for a root process to enter that namespace with an unsafe uid or gid, and then using the ptrace system call. NOTE: the vendor states "there is no kernel bug here.

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