UBUNTU-CVE-2019-11190

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UBUNTU-CVE-2019-11190

Summary:

Details: The Linux kernel before 4.8 allows local users to bypass ASLR on setuid programs (such as /bin/su) because install_exec_creds() is called too late in load_elf_binary() in fs/binfmt_elf.c, and thus the ptrace_may_access() check has a race condition when reading /proc/pid/stat.

References: https://ubuntu.com/security/CVE-2019-11190, https://git.kernel.org/linus/9f834ec18defc369d73ccf9e87a2790bfa05bf46, https://www.openwall.com/lists/oss-security/2019/04/03/4, http://www.openwall.com/lists/oss-security/2019/04/15/1, https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/commit/?id=a5b5352558f6808db0589644ea5401b3e3148a0d, https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/commit/?id=e1676b55d874a43646e8b2c46d87f2f3e45516ff, https://www.openwall.com/lists/oss-security/2019/04/03/4/1, https://ubuntu.com/security/notices/USN-4008-1, https://ubuntu.com/security/notices/USN-4008-3, https://www.cve.org/CVERecord?id=CVE-2019-11190