The landing site for Trackr Services
A defender-oriented analysis of firmware- and bootloader-resident implants on perimeter network appliances, what they look like in practice, how to detect them, and how to map the response to NIST 800-53.
Hyunwoo Kim’s Dirty Frag chain extends the Dirty Pipe / Copy Fail class to skb paged fragments. The xfrm ESP receive path provides a deterministic 4-byte page-cache store (CVE-2026-43284); the rxrpc receive path provides a namespace-free trigger (CVE-2026-43500). One PoC, no race, root on Ubuntu, RHEL, CentOS Stream, AlmaLinux, Fedora, and openSUSE — including hosts that already blocklisted algif_aead for Copy Fail.
Immutable base images plus systemd sysext/confext overlays have quietly become the standard for fleet-managed Linux in 2026. They also created a persistence surface most SOCs are not yet watching.
A double-free in Apache httpd 2.4.66’s mod_http2 lets unauthenticated clients crash workers reliably and, on certain builds, opens a path to remote code execution. Here’s the defender-oriented breakdown: mechanism, detection, remediation, and 800-53 mapping.
Model Context Protocol gives agents a clean way to call tools, but it also gives every piece of retrieved content a direct line to those tools. The classic confused deputy problem is back, and most deployments are not handling it.
Model Context Protocol turned every internal API into an LLM-reachable tool. The threat model didn’t catch up. Here’s what tool poisoning looks like in production and how to harden against it.
Model Context Protocol turned every developer’s laptop into a tool-calling agent host. The trust model that came with it is closer to npm circa 2016 than to anything a serious authorizing official would sign.
Trellix has confirmed unauthorized access to part of its source code repository. The disclosure is thin on detail and heavy on implications for every shop running Trellix EDR or XDR.
Theori’s Copy Fail flaw turns a nine-year-old in-place optimization in the kernel’s AEAD socket layer into a deterministic 4-byte page-cache write. No race, no offset hunting, no per-distro tuning. A 732-byte Python script edits a setuid binary’s cached pages and hands you root on Ubuntu, RHEL, SUSE, and Amazon Linux without modification.
Indirect prompt injection has graduated from a research curiosity to a routine cause of agent compromise. Here is what defenders are actually shipping in 2026, and where the control gaps still are.
