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A vulnerability in FreeBSD's listening socket accept filters (accf_create callback) in versions 13.0-STABLE before n245050, 12.2-STABLE before r369525, 13.0-RC4 before p0, and 12.2-RELEASE before p6, where the accf_create callback incorrectly freed a process-supplied argument string. Subsequent operations on the socket could result in a double free or use-after-free condition.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a proof-of-concept (PoC) exploit for CVE-2021-29627, a vulnerability in the FreeBSD kernel related to the interaction between MAC (Mandatory Access Control) labels and accept filters on sockets. The repository contains five files: a license, a brief README, the main exploit code (exploit/main.c), a Makefile for building a kernel module, and the module source (mod/accept_filter_mod.c). The main exploit (exploit/main.c) creates a UNIX domain socket at /tmp/exploit, sets a custom accept filter (implemented in mod/accept_filter_mod.c), and sprays MAC labels using the mac_set_fd function. The goal is to trigger the kernel bug by manipulating the socket's state and associated MAC labels. The kernel module (mod/accept_filter_mod.c) defines a minimal accept filter named 'exploit' that can be loaded into the FreeBSD kernel to facilitate the exploit. No remote network endpoints are involved; the attack is local and requires the ability to load kernel modules and interact with the MAC framework. The exploit is a PoC and does not provide a weaponized payload, but demonstrates the conditions necessary to trigger the vulnerability.
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1 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.