Threat Landscape just disclosed a new Linux local privilege escalation bug: CVE-2026-46331, code name “pedit COW”. It targets the kernel’s traffic control subsystem (tc), which classifies and rewrites network packets. If exploited successfully, attackers don’t need to “break through” your network perimeter. Instead, they can bypass local security controls and directly obtain full root privileges from the compromised host. What’s especially worrying: the impact spans key kernel and distro combinations. Red Hat Enterprise Linux 8–10 users should pay close attention. Ubuntu and Debian versions running Linux 5.18 through 7.1-rc6 are also in the affected set. SUSE, Oracle Linux, Amazon Linux, and CloudLinux have since issued guidance as well. Timing matters. Shortly after disclosure, a proof-of-concept appeared (“packet_edit_meme”) chaining an out-of-bounds write into successful privilege escalation and a root shell. The root cause relates to a flawed copy-on-write (COW) implementation in act_pedit logic, triggered by incorrect offset handling (tcfp_off_max_hint). Remediation reportedly landed by 7.1-rc7 and can be backported. Even detection is hard: integrity tools like AIDE/Tripwire may miss memory-only corruption. Patch fast and monitor for abnormal privilege escalation. #LinuxSecurity #CVE #PrivilegeEscalation #KernelVulnerabilities #RedTeam #BlueTeam
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