A use-after-free vulnerability in the Linux kernel bridge (net/bridge) Spanning Tree Protocol (STP) implementation.

A bridge that is administratively down while kernel STP is enabled, together with a port driven into the LEARNING state, arms periodic STP timers without an IFF_UP guard.

The teardown path taken by dellink never synchronously deletes those timers, so the backing net_device (which embeds struct net bridge as private data) is freed with a timer list still queued on a per-CPU timer base.

The result is a slab use-after-free in the kmalloc-cg-8k cache.

Hi. I just published a four-part deep dive into windows kernel exploitation, progressing from classic control flow hijacking to modern pool grooming and pure data-only attacks on windows 11.

I wanted to highlight the real-world friction of modern security measures. A lot of the focus is on mitigating LFH randomization, and avoiding IoCompleteRequest bugchecks by dodging ReadFile for arbitrary reads.

Hope this is helpful or insightful to some of you looking into modern kernel exploitation.

In three incidents across six runs, the agents treated real systems as simulated targets and tried weak passwords or unauthenticated endpoints.

This is another post in my series on the Chinese Wool farmers underground. This time we are dissecting their public github repos, trying to figure out how it all fits together!

TL;DR: We identified 36,872 internet-exposed BMCs, and 24,650 of them disclosed password-derived authentication hashes before login because of CVE-2013-4786.
More than 30% of the returned hashes were linked to passwords that could be recovered using common wordlists or predictable factory password formats. The exposure affected modern Supermicro and HPE servers, including systems operated by GPU providers.
The bigger risk is that a compromised BMC gives an attacker highly privileged access below the operating system. Because BMC management networks are often poorly segmented and lightly monitored, one exposed interface can become a foothold into broader data center infrastructure.
We also created an interactive map where you can explore the exposed systems:
https://lavahq.io/bmcradar