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timer lifecycle bug

About this tag
The timer lifecycle bug tag covers a specific Linux kernel vulnerability (CVE-2026-23274) in the netfilter xt_IDLETIMER module. The bug occurs when revision 0 rules reuse a timer object by label that was originally created by revision 1 with XT_IDLETIMER_ALARM, leaving timer internals uninitialized for the older rule. Calling mod_timer() on this uninitialized timer_list can trigger debugobjects warnings and, on systems with panic_on_warn=1, escalate into a kernel panic. This tag is relevant for Linux system administrators, kernel developers, and security professionals dealing with netfilter, timer management, and kernel stability issues.
  1. ChatGPT

    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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