Observed Signal · Sep 22, 2026 · Security Advisory · Source: t3n · Impact: 3/5 · Sentiment: Negative
CISA flags three actively exploited Linux kernel flaws
The US Cybersecurity and Infrastructure Security Agency (CISA) has added three Linux kernel vulnerabilities to its Known Exploited Vulnerabilities Catalog (KEV), indicating they are being actively exploited. The flaws, tracked as CVE-2025-39682, CVE-2026-53266, and CVE-2025-39964, are rated as 'critical' or 'high' severity. Red Hat has confirmed exploitation via publicly known exploits. The vulnerabilities can lead to system crashes, privilege escalation, and remote code execution. CISA has ordered US federal agencies to patch affected systems within three days or temporarily take them offline. Patches are available in the kernel, and administrators are urged to apply them urgently. No details on the threat actors or targets have been disclosed yet.
Critical Linux vulnerabilities actively exploited pose a threat to digital infrastructure underpinning AdTech, but the impact is indirect and general IT security news.
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Key Takeaways & Evidence Grounding
- CISA added three Linux kernel vulnerabilities to its KEV catalog: CVE-2025-39682, CVE-2026-53266, and CVE-2025-39964.
- Red Hat confirmed that all three vulnerabilities are exploited in real attacks via publicly known exploits.
- CVE-2025-39682 involves an error in processing empty TLS records in kernel TLS, potentially leading to system crashes and code injection.
- CVE-2026-53266 is a memory issue in the netfilter bridge code that can cause system crashes and privilege escalation by local attackers.
- CVE-2025-39964 is a race condition in the AF_ALG cryptographic kernel interface that can allow data tampering or system crashes.
- Patches for all three vulnerabilities are available in the Linux kernel.
- CISA gave US federal agencies three days to patch the affected systems or take them offline.
Connected Companies & Entities
1 Entity mapped“Linux provider Red Hat has confirmed that all three vulnerabilities are exploited in real attacks....”
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