{"id":40130,"date":"2026-05-05T10:55:32","date_gmt":"2026-05-05T08:55:32","guid":{"rendered":"https:\/\/www.cloudmagazin.com\/2026\/05\/07\/cve-2026-31431-copyfail-was-dach-cloud-betreiber-jetzt\/"},"modified":"2026-05-08T06:43:24","modified_gmt":"2026-05-08T04:43:24","slug":"cve-2026-31431-copyfail-was-dach-cloud-betreiber-jetzt","status":"publish","type":"post","link":"https:\/\/www.cloudmagazin.com\/en\/2026\/05\/05\/cve-2026-31431-copyfail-was-dach-cloud-betreiber-jetzt\/","title":{"rendered":"DACH Cloud Providers Lag Behind on Patching"},"content":{"rendered":"<p style=\"color:#6190a9;font-size:0.9em;margin:0 0 16px;padding:0;\">6 Min. Reading Time<\/p>\n<p style=\"line-height:1.8;margin-bottom:20px;\"><strong>CISA added CVE-2026-31431 to the Known Exploited Vulnerabilities catalog on May 4, 2026. CrowdStrike confirms active exploitation in the wild. Affected: every Linux instance with a kernel from 2017 onwards and the loaded AF_ALG module. For DACH cloud operators, this means in practice: almost every productive EC2, Compute Engine, and Azure VM fleet needs a patch or a clean workaround within the next 72 hours.<\/strong><\/p>\n<h2>Key Takeaways<\/h2>\n<ul>\n<li><strong>SSH foothold is the real entry point:<\/strong> CVE-2026-31431 is not remotely exploitable but requires a local session. In cloud environments with leaked keys, weak bastion configurations, or compromised CI runners, that&#8217;s enough. The vulnerability turns a normal shell access into root.<\/li>\n<li><strong>Workload scope is broad, not deep:<\/strong> Affected are AWS EC2, Azure VMs, GCP Compute Engine, Hetzner servers, container hosts, Kubernetes worker nodes, CI runners, and SSH bastions. Managed container services (Fargate, Cloud Run) are only indirectly affected if the underlying host is unpatched.<\/li>\n<li><strong>Workaround before patch is legitimate:<\/strong> Those who cannot patch within 72 hours can disable AF_ALG via modprobe blacklist. This prevents the exploit but costs performance in crypto operations that use the kernel interface. Test before production.<\/li>\n<\/ul>\n<p style=\"font-size:0.88em;color:#666;margin:20px 0 32px 0;border-top:1px solid #e5e5e5;border-bottom:1px solid #e5e5e5;padding:10px 0;\"><span style=\"color:#004a59;font-weight:700;text-transform:uppercase;font-size:0.72em;letter-spacing:0.14em;margin-right:14px;\">Related:<\/span><a href=\"https:\/\/www.cloudmagazin.com\/en\/2026\/05\/07\/container-image-diet-2026-distroless-wolfi-chainguard-dach\/\" style=\"color:#333;text-decoration:underline;\">Container Image Diet 2026: Distroless, Wolfi, Chainguard<\/a>&nbsp;&nbsp;<span style=\"color:#ccc;\">\/<\/span>&nbsp;&nbsp;<a href=\"https:\/\/www.cloudmagazin.com\/en\/2026\/05\/03\/state-of-finops-2026-technology-value-management-dach-cloud\/\" style=\"color:#333;text-decoration:underline;\">State of FinOps 2026<\/a><\/p>\n<h2 style=\"margin-top:64px;margin-bottom:20px;padding-top:16px;\">What happened on 05\/04\/2026<\/h2>\n<p style=\"line-height:1.8;margin-bottom:20px;\"><strong>What is CVE-2026-31431?<\/strong> CVE-2026-31431, internally referred to as &#8220;copyfail,&#8221; is a local privilege escalation vulnerability in the Linux kernel. It is located in the AF_ALG interface of the kernel crypto API and combines a flaw in the ONC-ESN component with a page cache write primitive. An attacker with normal shell access on the system can escalate to root privileges. All Linux distributions with a kernel containing the AF_ALG implementation from 2017 or later are affected.<\/p>\n<p style=\"line-height:1.8;margin-bottom:20px;\">The <a href=\"https:\/\/theori.io\/blog\/cve-2026-31431\" target=\"_blank\" rel=\"noopener\">proof-of-concept by Theori<\/a> is a 732-line Python exploit. What&#8217;s notable is not its size, but the method of discovery: Theori&#8217;s autonomous AI agent scanned for the vulnerability, constructed the exploit primitive, and completed the PoC in about an hour. CISA added the vulnerability to the <a href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\" target=\"_blank\" rel=\"noopener\">KEV catalog<\/a> on the same day, and CrowdStrike Threat Intelligence confirmed active exploitation.<\/p>\n<p style=\"line-height:1.8;margin-bottom:20px;\">For US federal agencies, the KEV listing triggers a strict patch deadline. While this is not binding for DACH organizations, the signal is clear: a public exploit, active exploitation, and broad distro coverage generate patch pressure regardless of the supervisory authority.<\/p>\n<div style=\"display:flex;flex-wrap:wrap;gap:16px;margin:40px 0;\">\n<div style=\"flex:1;min-width:200px;background:#004a59;border-radius:8px;padding:20px 24px;\">\n<div style=\"font-size:11px;font-weight:700;color:#0bb7fd;text-transform:uppercase;letter-spacing:0.5px;margin-bottom:8px;\">METRIC<\/div>\n<div style=\"font-size:36px;font-weight:800;color:#0bb7fd;line-height:1;white-space:nowrap;\">10 Percent<\/div>\n<div style=\"font-size:13px;color:#fff;margin-top:8px;opacity:0.8;line-height:1.3;\">of production, then the rest. Relevant for auto-scaling groups<\/div>\n<\/div>\n<div style=\"flex:1;min-width:200px;background:#002535;border-radius:8px;padding:20px 24px;\">\n<div style=\"font-size:11px;font-weight:700;color:#0bb7fd;text-transform:uppercase;letter-spacing:0.5px;margin-bottom:8px;\">METRIC<\/div>\n<div style=\"font-size:36px;font-weight:800;color:#0bb7fd;line-height:1;white-space:nowrap;\">62 Percent<\/div>\n<div style=\"font-size:13px;color:#fff;margin-top:8px;opacity:0.8;line-height:1.3;\">in AI governance MyBusinessFuture: EUDI Wallet from Pi<\/div>\n<\/div>\n<div style=\"flex:1;min-width:200px;background:#00364a;border-radius:8px;padding:20px 24px;\">\n<div style=\"font-size:11px;font-weight:700;color:#0bb7fd;text-transform:uppercase;letter-spacing:0.5px;margin-bottom:8px;\">METRIC<\/div>\n<div style=\"font-size:36px;font-weight:800;color:#0bb7fd;line-height:1;white-space:nowrap;\">05.202<\/div>\n<div style=\"font-size:13px;color:#fff;margin-top:8px;opacity:0.8;line-height:1.3;\">6 added to the Known Exploited Vulnerabilities catalog<\/div>\n<\/div>\n<\/div>\n<h2 style=\"margin-top:64px;margin-bottom:20px;padding-top:16px;\">Where Cloud Workloads Are Specifically Affected<\/h2>\n<p style=\"line-height:1.8;margin-bottom:20px;\">The reach across hyperscalers is high. AWS Linux 2 and Amazon Linux 2023 load AF_ALG by default. Azure Ubuntu, Azure RHEL, and Azure SUSE do the same. Google Compute Engine with Debian, Ubuntu, or Container-Optimized OS also loads it by default. Anyone operating EC2 Auto Scaling Groups, AKS worker nodes, GKE nodes, or self-hosted Kubernetes clusters should check the patch status per image and per node pool.<\/p>\n<p style=\"line-height:1.8;margin-bottom:20px;\">CI and build infrastructure is the second silent risk zone. GitHub Actions self-hosted runners, GitLab Runner on own hosts, Jenkins agents, and Buildkite workers typically run on standard Linux. A compromised pull request job with a shell stage potentially has root access on the build host. The standard recommendation to &#8220;regularly replace runners&#8221; becomes a must in this situation.<\/p>\n<div style=\"text-align:center;background:#f0f9fa;border-radius:12px;padding:32px 24px;margin:32px 0;\">\n<div style=\"font-size:48px;font-weight:700;color:#004a59;letter-spacing:-0.03em;\">~60 min<\/div>\n<div style=\"font-size:15px;color:#444;margin-top:8px;\">Scan-to-PoC time of Theori&#8217;s AI agent \u2013 from source code analysis to functional exploit.<\/div>\n<div style=\"font-size:12px;color:#888;margin-top:8px;\">Source: <a href=\"https:\/\/theori.io\" target=\"_blank\" rel=\"noopener\" style=\"color:#888;\">Theori, 04.05.2026<\/a><\/div>\n<\/div>\n<p style=\"line-height:1.8;margin-bottom:20px;\">Managed container services provide some relief. AWS Fargate, Google Cloud Run, and Azure Container Apps abstract the host from the workload. The platform operators patch the hosts; customers only need to adjust their container images if the container itself performs privileged operations. However, those running containers with hostPID, hostNetwork, or privileged mode, or operating Kubernetes workers themselves, are again in patch-compliance mode.<\/p>\n<blockquote style=\"border-left:4px solid #0bb7fd;margin:32px 0;padding:20px 24px;background:#fafafa;border-radius:0 8px 8px 0;font-size:1.1em;line-height:1.6;color:#333;\">\n<p>\n&#8220;Active exploitation in the wild confirmed. All unpatched Linux systems with AF_ALG enabled are at risk.&#8221;<br \/>\n<cite style=\"display:block;margin-top:12px;font-size:0.8em;color:#888;font-style:normal;\">CrowdStrike Threat Intelligence, 04.05.2026<\/cite>\n<\/p>\n<\/blockquote>\n<h2 style=\"margin-top:64px;margin-bottom:20px;padding-top:16px;\">Patch Path Within 72 Hours<\/h2>\n<p style=\"line-height:1.8;margin-bottom:20px;\">The quick path typically looks the same in productive cloud fleets. First: inventory. Which Linux versions are running, with which kernel, in which Auto Scaling Groups or node pools? AWS customers can get this information from Systems Manager Inventory, Azure from Update Management, and GCP from OS Config. Those without it can build an ad-hoc inventory for an hour using <a href=\"https:\/\/www.cloudmagazin.com\/en\/2026\/04\/28\/architecture-drives-compliance-costs\/\" style=\"color:#0bb7fd;text-decoration:underline;\">SSM Run Command or Ansible ad-hoc<\/a>.<\/p>\n<p style=\"line-height:1.8;margin-bottom:20px;\">Second: patch rollout in waves. Stage first, then 10 percent of production, and finally the rest. For Auto Scaling Groups, this means a new AMI with the patched kernel and a rolling replace. For Kubernetes, it means a node pool upgrade, ideally with PDB protection on core workloads. Third: verification. A single command per patched machine is sufficient: checking <span style=\"font-family:monospace;background:#f4f4f4;padding:1px 5px;border-radius:3px;font-size:0.92em;\">uname -r<\/span> against the distro-specific fix kernel.<\/p>\n<p style=\"line-height:1.8;margin-bottom:20px;\">Those unable to meet the 72-hour path have a workaround. The file <span style=\"font-family:monospace;background:#f4f4f4;padding:1px 5px;border-radius:3px;font-size:0.92em;\">\/etc\/modprobe.d\/blacklist-af_alg.conf<\/span> with the line <span style=\"font-family:monospace;background:#f4f4f4;padding:1px 5px;border-radius:3px;font-size:0.92em;\">install af_alg \/bin\/false<\/span> prevents the module from being loaded during boot. Existing sessions require a reboot for the change to take effect. Caution: TLS offloading, disk encryption stacks, and HSM connections that use AF_ALG will fall back to user-space fallbacks. Measure performance impact before production.<\/p>\n<h2 style=\"padding-top:64px;margin-bottom:20px;\">Frequently Asked Questions<\/h2>\n<details>\n<summary><strong>Are containers in managed services like Fargate or Cloud Run directly affected?<\/strong><\/summary>\n<p style=\"margin:8px 0 4px 24px;color:#555;line-height:1.6;\">Not directly. The hyperscaler patches the host, and the container below doesn&#8217;t see the kernel interface at all. Indirectly, yes: if a container runs with privileged mode or hostPID, or if the app itself triggers AF_ALG operations, the exploit can become relevant in such environments. Standard web workloads without kernel crypto operations are not the primary target.<\/p>\n<\/details>\n<details>\n<summary><strong>Which Linux distributions have patches available as of May 5, 2026?<\/strong><\/summary>\n<p style=\"margin:8px 0 4px 24px;color:#555;line-height:1.6;\">Red Hat Enterprise Linux 8 and 9 have updates available through the regular Errata channel. Ubuntu LTS 20.04, 22.04, and 24.04 have patches in the Security Pocket. Debian Stable has the update in the Stable Security repository. Amazon Linux 2 and Amazon Linux 2023 are available via yum\/dnf. SUSE Linux Enterprise 15 is in the Maintenance channel. Arch and openSUSE Tumbleweed roll with the mainline kernel. Alpine Linux typically follows within 48 hours.<\/p>\n<\/details>\n<details>\n<summary><strong>How significant is the performance impact of the AF_ALG workaround?<\/strong><\/summary>\n<p style=\"margin:8px 0 4px 24px;color:#555;line-height:1.6;\">Highly dependent on the workload. A standard web server with OpenSSL doesn&#8217;t use AF_ALG and has zero impact. Disk encryption with dm-crypt falls back to user-space AES, which makes a minor difference on modern CPUs with AES-NI. HSM and PKCS11 connections that use AF_ALG for hardware abstraction can become significantly slower. Before implementing the workaround in production, measure a short load spike on a staging node.<\/p>\n<\/details>\n<details>\n<summary><strong>Is a reboot sufficient after patching, or is more required?<\/strong><\/summary>\n<p style=\"margin:8px 0 4px 24px;color:#555;line-height:1.6;\">A patch in the kernel image file only takes effect after a reboot. In auto-scaling groups, this is practically done via a new AMI with a patched kernel. In Kubernetes, it&#8217;s done via a node pool upgrade. Live patching via kpatch or kgraft is possible on some distributions but not all. Those without live patching in their stack should plan a rolling reboot within the 72-hour window.<\/p>\n<\/details>\n<details>\n<summary><strong>What about ARM-based cloud instances like AWS Graviton?<\/strong><\/summary>\n<p style=\"margin:8px 0 4px 24px;color:#555;line-height:1.6;\">Also affected. AF_ALG is a kernel interface, independent of the CPU architecture. AWS Graviton, Azure Cobalt, and Google Tau-T2A all run with the same Linux distributions as x86 instances. The patch path is identical: distro-specific update, reboot, verification.<\/p>\n<\/details>\n<h2 style=\"padding-top:64px;margin-bottom:20px;\">More from the MBF Media Network<\/h2>\n<ul style=\"list-style:none;padding:0;margin:0;\">\n<li style=\"margin-bottom:12px;\"><a href=\"https:\/\/www.securitytoday.de\/2026\/05\/04\/rsa-conference-2026-wrap-up-dach-ciso-hausaufgaben-pqc-detection-vendor-konsolidierung\/\" style=\"color:#0bb7fd;text-decoration:underline;\"><strong class=\"mag-st\">SecurityToday:<\/strong> RSA Conference 2026 Wrap-up \u2013 DACH CISO homework on PQC, Detection, Vendor Consolidation<\/a><\/li>\n<li style=\"margin-bottom:12px;\"><a href=\"https:\/\/www.digital-chiefs.de\/cio-ki-governance-kompromiss-logicalis-report-2026\/\" style=\"color:#0bb7fd;text-decoration:underline;\"><strong class=\"mag-dc\">Digital Chiefs:<\/strong> CIOs under pressure \u2013 62 percent on AI governance<\/a><\/li>\n<li style=\"margin-bottom:12px;\"><a href=\"https:\/\/mybusinessfuture.com\/eudi-wallet-pilot-rollout-2026-mittelstand-kyc-identity-infrastruktur\/\" style=\"color:#0bb7fd;text-decoration:underline;\"><strong class=\"mag-mbf\">MyBusinessFuture:<\/strong> EUDI Wallet from pilot rollout 2026 \u2013 Identity infrastructure for SMEs<\/a><\/li>\n<\/ul>\n<p style=\"text-align:right;font-style:italic;color:#888;font-size:0.85em;margin-top:32px;\">Source title image: Pexels \/ Brett Sayles<\/p>\n","protected":false},"excerpt":{"rendered":"<span class=\"evm-reading-time\" style=\"display:inline-block;padding:3px 12px;border-radius:14px;background:#0bb7fd;color:#fff;font-size:0.78em;font-weight:600;letter-spacing:0.02em;line-height:1.4;vertical-align:middle;\">~7 Min. Lesezeit<\/span><span class=\"evm-meta-sep\" style=\"display:inline-block;margin:0 8px;color:#999;font-size:0.85em;vertical-align:middle;\">&#8211;<\/span> <span class=\"evm-reading-time\" style=\"display:inline-block;padding:3px 12px;border-radius:14px;background:#0bb7fd;color:#fff;font-size:0.78em;font-weight:600;letter-spacing:0.02em;line-height:1.4;vertical-align:middle;\">~7 Min. Lesezeit<\/span><span class=\"evm-meta-sep\" style=\"display:inline-block;margin:0 8px;color:#999;font-size:0.85em;vertical-align:middle;\">&#8211;<\/span> A vulnerability in a helper tool exposes foreign VMs; exploits have been running for days. Cloud operators must patch now, not next week.","protected":false},"author":31,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"A hidden cloud vulnerability hits DACH providers harder than expected \u2013 what IT managers need to address now.","_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_meta-robots-nofollow":"","_yoast_wpseo_meta-robots-adv":"","_yoast_wpseo_canonical":"","_yoast_wpseo_opengraph-title":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_opengraph-image":"","_yoast_wpseo_opengraph-image-id":0,"_yoast_wpseo_twitter-title":"","_yoast_wpseo_twitter-description":"","_yoast_wpseo_twitter-image":"","_yoast_wpseo_twitter-image-id":0,"ngg_post_thumbnail":0,"pre_headline":"","bildquelle":"","teasertext":"","language":"de","footnotes":""},"categories":[13],"tags":[],"industry":[],"class_list":["post-40130","post","type-post","status-publish","format-standard","hentry","category-aktuelles"],"evm_reading_time_minutes":7,"wpml_language":"en","wpml_translation_of":39234,"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - 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