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kernel panic on warn

About this tag
The kernel panic on warn tag covers Linux kernel bugs where a non-fatal warning condition is escalated into a full system crash via the panic_on_warn kernel parameter. The primary example is CVE-2026-23274, a vulnerability in the netfilter xt_IDLETIMER module. In this bug, reusing a timer object created by a different revision of the rule can leave timer internals uninitialized, triggering debugobjects warnings. On systems configured with panic_on_warn=1, these warnings cause a kernel panic. This tag is relevant for Linux system administrators and security professionals who need to understand how seemingly minor kernel warnings can become critical crash vectors, especially in enterprise or production environments where uptime is essential.
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    CVE-2026-23274: xt_IDLETIMER Timer-Label Reuse Can Trigger Kernel Panic

    Linux kernel CVE-2026-23274 is a small-looking bug with a very specific failure mode, but it sits in exactly the kind of kernel plumbing that can turn a bookkeeping mistake into a crash. The issue is in the netfilter xt_IDLETIMER path: revision 0 rules can reuse an existing timer object by...
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    • kernel panic on warn linux kernel security netfilter xt_idletimer timer lifecycle bug
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    • Forum: Security Alerts
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