Linux kernel versions starting at 4.10 and below 5.1.7 PTRACE_TRACEME local root exploit that uses the pkexec technique.
d7e0ed96547c7d01ac4e58b7c8003196This Metasploit module exploits an issue in ptrace_link in kernel/ptrace.c before Linux kernel 5.1.17. This issue can be exploited from a Linux desktop terminal, but not over an SSH session, as it requires execution from within the context of a user with an active Polkit agent. 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.
a67b52657090e25d42aa370f66e7ca88Red Hat Security Advisory 2019-2809-01 - The kernel-alt packages provide the Linux kernel version 4.x. Issues addressed include null pointer and use-after-free vulnerabilities.
e717c57f9c31d81a38fc03aec1e5260dUbuntu Security Notice 4117-1 - It was discovered that a heap buffer overflow existed in the Marvell Wireless LAN device driver for the Linux kernel. An attacker could use this to cause a denial of service or possibly execute arbitrary code. Amit Klein and Benny Pinkas discovered that the Linux kernel did not sufficiently randomize IP ID values generated for connectionless networking protocols. A remote attacker could use this to track particular Linux devices. Various other issues were also addressed.
5eadaf8ccbc112d9e27cc01c1d4ad083It was discovered that the USB video device class implementation in the Linux kernel did not properly validate control bits, resulting in an out of bounds buffer read. A local attacker could use this to possibly expose sensitive information (kernel memory). It was discovered that the Marvell Wireless LAN device driver in the Linux kernel did not properly validate the BSS descriptor. A local attacker could possibly use this to cause a denial of service (system crash) or possibly execute arbitrary code. Various other vulnerabilities have also been addressed.
1de971967f43f22fa4ee2b9590b93d64Ubuntu Security Notice 4093-1 - It was discovered that a heap buffer overflow existed in the Marvell Wireless LAN device driver for the Linux kernel. An attacker could use this to cause a denial of service or possibly execute arbitrary code. Andrei Vlad Lutas and Dan Lutas discovered that some x86 processors incorrectly handle SWAPGS instructions during speculative execution. A local attacker could use this to expose sensitive information. Various other issues were also addressed.
c0b6be2dc1ffa0bcd5add84b3fac57dfUbuntu Security Notice 4095-1 - Eli Biham and Lior Neumann discovered that the Bluetooth implementation in the Linux kernel did not properly validate elliptic curve parameters during Diffie-Hellman key exchange in some situations. An attacker could use this to expose sensitive information. It was discovered that a heap buffer overflow existed in the Marvell Wireless LAN device driver for the Linux kernel. An attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.
ff726cc76288b070879d39966cb18209Ubuntu Security Notice 4094-1 - It was discovered that the alarmtimer implementation in the Linux kernel contained an integer overflow vulnerability. A local attacker could use this to cause a denial of service. Wen Xu discovered that the XFS filesystem implementation in the Linux kernel did not properly track inode validations. An attacker could use this to construct a malicious XFS image that, when mounted, could cause a denial of service. Various other issues were also addressed.
3b73671d729375d8de90582cb3d31f24Red Hat Security Advisory 2019-2411-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system.
db66a27f852a52baa108fabfac35e8d7Red Hat Security Advisory 2019-2405-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
d0c6124bb4ce80f52013703fac6b4127Slackware Security Advisory - New kernel packages are available for Slackware 14.2 to fix security issues.
dcc164dee87e520c21919a34673ad54bDebian Linux Security Advisory 4484-1 - Jann Horn discovered that the ptrace subsystem in the Linux kernel mishandles the management of the credentials of a process that wants to create a ptrace relationship, allowing a local user to obtain root privileges under certain scenarios.
492216f4fa5e3ebcc3b8f8c6ba353108Linux suffers from broken permission and object lifetime handling for PTRACE_TRACEME.
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