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In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to create a ptrace relationship, which allows local users to obtain root access by leveraging certain scenarios with a parent-child process relationship, where a parent drops privileges and calls execve (potentially allowing control by an attacker). One contributing factor is an object lifetime issue (which can also cause a panic). Another contributing factor is incorrect marking of a ptrace relationship as privileged, which is exploitable through (for example) Polkit's pkexec helper with PTRACE_TRACEME. NOTE: SELinux deny_ptrace might be a usable workaround in some environments.

• http://packetstormsecurity.com/files/153663/Linux-PTRACE_TRACEME-Broken-Permission-Object-Lifetime-Handling.html x_refsource_MISC
• https://bugs.chromium.org/p/project-zero/issues/detail?id=1903 x_refsource_MISC
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.1.17 x_refsource_MISC
• https://github.com/torvalds/linux/commit/6994eefb0053799d2e07cd140df6c2ea106c41ee x_refsource_MISC
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6994eefb0053799d2e07cd140df6c2ea106c41ee x_refsource_MISC
• https://bugzilla.suse.com/show_bug.cgi?id=1140671 x_refsource_CONFIRM
• https://bugzilla.redhat.com/show_bug.cgi?id=1730895 x_refsource_CONFIRM
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OGRK5LYWBJ4E4SRI4DKX367NHYSI3VOH/ vendor-advisoryx_refsource_FEDORA
• https://www.debian.org/security/2019/dsa-4484 vendor-advisoryx_refsource_DEBIAN
• https://seclists.org/bugtraq/2019/Jul/30 mailing-listx_refsource_BUGTRAQ
• https://seclists.org/bugtraq/2019/Jul/33 mailing-listx_refsource_BUGTRAQ
• https://lists.debian.org/debian-lts-announce/2019/07/msg00022.html mailing-listx_refsource_MLIST
• https://lists.debian.org/debian-lts-announce/2019/07/msg00023.html mailing-listx_refsource_MLIST
• http://packetstormsecurity.com/files/153702/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html x_refsource_MISC
• https://security.netapp.com/advisory/ntap-20190806-0001/ x_refsource_CONFIRM
• https://access.redhat.com/errata/RHSA-2019:2405 vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2019:2411 vendor-advisoryx_refsource_REDHAT
• https://usn.ubuntu.com/4093-1/ vendor-advisoryx_refsource_UBUNTU
• https://usn.ubuntu.com/4094-1/ vendor-advisoryx_refsource_UBUNTU
• https://usn.ubuntu.com/4095-1/ vendor-advisoryx_refsource_UBUNTU
• http://packetstormsecurity.com/files/154245/Kernel-Live-Patch-Security-Notice-LSN-0054-1.html x_refsource_MISC
• https://support.f5.com/csp/article/K91025336 x_refsource_CONFIRM
• https://usn.ubuntu.com/4117-1/ vendor-advisoryx_refsource_UBUNTU
• https://usn.ubuntu.com/4118-1/ vendor-advisoryx_refsource_UBUNTU
• https://access.redhat.com/errata/RHSA-2019:2809 vendor-advisoryx_refsource_REDHAT
• https://support.f5.com/csp/article/K91025336?utm_source=f5support&amp%3Butm_medium=RSS x_refsource_CONFIRM
• http://packetstormsecurity.com/files/154957/Linux-Polkit-pkexec-Helper-PTRACE_TRACEME-Local-Root.html x_refsource_MISC
• http://packetstormsecurity.com/files/156929/Linux-PTRACE_TRACEME-Local-Root.html x_refsource_MISC
• http://packetstormsecurity.com/files/165051/Linux-Kernel-5.1.x-PTRACE_TRACEME-pkexec-Local-Privilege-Escalation.html x_refsource_MISC
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-13272 government-resource