VulnerabilitiesNov 3, 2026

Attackers Started Scanning in the Wild for Linux Kernel RCE Flaw, Ubuntu Releases Fixes

Attackers are scanning for Linux kernel RCE flaw CVE-2026-98432; Ubuntu releases early fixes.

A critical Linux kernel vulnerability, CVE-2026-98432, allowing remote command execution as root, is being actively scanned for in the wild. Ubuntu has released early fixes in its -proposed pocket for several LTS releases, though patches are still in testing. The flaw, a use-after-free bug in IPv4 TCP connection setup, affects kernel versions 4.4 and later, with researchers noting potential exploit development using AI models.

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The lesson from this incident

Full lesson

A use-after-free bug in the Linux kernel's IPv4 TCP connection handling (CVE-2026-98432) allows unauthenticated remote attackers to execute commands as root, affecting kernel versions 4.4 and later — a massive portion of production Linux infrastructure worldwide. The danger is compounded by the fact that Ubuntu's fixes are only available in a testing ('proposed') pocket, meaning most organizations cannot yet apply a stable, vendor-supported patch. Active scanning in the wild signals that threat actors are racing to develop working exploits, potentially accelerated by AI-assisted reverse engineering. This incident highlights the critical window of exposure that exists between vulnerability disclosure and stable patch availability, and why compensating controls must be ready to deploy immediately.

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Indicators of Compromise

Extracted by AI from the linked source. Not reviewed by an editor. How this works

cve — CVE-2026-98432

Entities

Linux Kernel (product)Ubuntu (vendor)Canonical (vendor)Claude (product)Anthropic (vendor)