ArchLinux: 201710-25: linux-hardened: privilege escalation
Summary
It was discovered that when the waitid() syscall in Linux kernel v4.13 was refactored, it accidentally stopped checking that the incoming argument was pointing to userspace. This allowed local attackers to write directly to kernel memory, which could lead to privilege escalation.
Resolution
Upgrade to 4.13.7.a-1.
# pacman -Syu "linux-hardened>=4.13.7.a-1"
The problem has been fixed upstream in version 4.13.7.a.
References
https://www.openwall.com/lists/oss-security/2017/10/12/18 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=96ca579a1ecc943b75beba58bebb0356f6cc4b51 https://security.archlinux.org/CVE-2017-5123
Workaround
None.