This is a fun bug I found while poking around at weird Windows file formats. It's a kind of classic Windows style vulnerability featuring broken signing, sketchy DLL loads, file races, cab files, and Mark-of-the-Web silliness. It was also my first experience submitting to the MSRC Windows bug bounty since leaving Microsoft in April of 2022.

An issue has been discovered in the Linux kernel that can be abused by
unprivileged local users to escalate privileges.

The issue is about Netfilter nf_tables accepting some invalid updates
to its configuration.

A flaw in exists in sudo’s -e option (aka sudoedit) that allows a malicious user with sudoedit privileges to edit arbitrary files.
Sudo versions affected: Sudo versions 1.8.0 through 1.9.12p1 inclusive are affected. Versions of sudo prior to 1.8.0 construct the argument vector differently and are not affected.
CVE ID: This vulnerability has been assigned CVE-2023-22809 in the Common Vulnerabilities and Exposures database.
Details: When invoked as sudo -e or sudoedit, sudo can be used to edit privileged files while running the editor as an unprivileged user.

This is the story of CVE-2022-0847, a vulnerability in the Linux kernel since 5.8 which allows overwriting data in arbitrary read-only files. This leads to privilege escalation because unprivileged processes can inject code into root processes.

It is similar to CVE-2016-5195 “Dirty Cow” but is easier to exploit.

The vulnerability was fixed in Linux 5.16.11, 5.15.25 and 5.10.102.