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Message-ID: <1d9ab7140a015e94829e2356a4c6c9e18d92b864.camel@kjb.biglobe.ne.jp>
Date: Wed, 11 Nov 2026 06:28:39 +0900
From: Nakashima Seiichi <s-nakashima@....biglobe.ne.jp>
To: kernel-hardening@...ts.openwall.com,
linux-security-module@...r.kernel.org
Subject: [Case Study] CVE-2024-0582: Why We Need a Standard for CVE
Emergency Mitigation
Hi all,
"The question is not 'can we block this?' The technology already can.
The question is 'how do we make blocking this repeatable, auditable,
and distributable across all Linux systems?' That is what a standard
addresses."
We suspect many of you already recognize the facts presented in this
case study. The patch gap is not a new problem. Tetragon, BPF LSM,
and seccomp-bpf are not new technologies. What we are attempting to
do here is not to discover something unknown, but to articulate
something that has remained implicit: the gap between "technically
possible" and "operationally scalable" is a standards problem, not a
technology problem.
Following up on the kaf (Kernel API Firewall) standard specification
RFC shared previously, we would like to share a concrete case study
that validates this premise.
The attached case study examines CVE-2024-0582, an io_uring
use-after-free vulnerability that had a 2.5-month patch gap between
upstream fix (December 2023) and Ubuntu deployment (February 2024).
During this gap, Exodus Intelligence successfully demonstrated a
data-only exploit achieving root from an unprivileged user.
Importantly, this case study does NOT claim that new kernel technology
is needed. Tetragon, BPF LSM, and seccomp-bpf are all capable of
blocking the vulnerable code path today. What does not exist is a
standardized way to package, distribute, and lifecycle-manage
CVE-specific policies across distributions and organizations.
The case study demonstrates the gap between "technically possible"
and "operationally scalable." With a standardized framework, the
mitigation could have started on CVE publication day instead of
waiting ~2.5 months for the distro patch.
The full analysis is in the attached HTML document. It includes:
- Detailed timeline of the patch gap
- Technical analysis of the exploit code path
- Policy definitions using existing technology in a standardized format
- Operational timeline showing how a standard would have worked
- Quantitative comparison: ad-hoc vs. standardized approach
This case study is intended to demonstrate that the question is not
"can we block this?" - the technology already can. The question is
"how do we make blocking this repeatable, auditable, and distributable
across all Linux systems?" That is what a standard addresses.
The kaf standard specification RFC is available at:
(Previously shared on kernel-hardening and linux-security-module)
Feedback, corrections, and discussion are welcome.
Best regards,
-- kaf Working Group
Acknowledgments: The structure, analysis, and drafting of this case
study were developed with assistance from Namazu, an AI assistant at
Sakana AI. The technical conclusions and policy direction remain the
responsibility of the kaf Working Group.
Nakashima Seiichi
Sakana AI's Namazu
View attachment "kaf_case_study_cve-2024-0582_en.html" of type "text/html" (29782 bytes)
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