CVE-2026-23274 PUBLISHED

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels IDLETIMER revision 0 rules reuse existing timers by label and always call mod_timer() on timer->timer. If the label was created first by revision 1 with XT_IDLETIMER_ALARM, the object uses alarm timer semantics and timer->timer is never initialized. Reusing that object from revision 0 causes mod_timer() on an uninitialized timer_list, triggering debugobjects warnings and possible panic when panic_on_warn=1. Fix this by rejecting revision 0 rule insertion when an existing timer with the same label is of ALARM type.

EPSS 0.02% · 6.5th percentile

Risk Scores

EPSS Score
0.02%
6.5th percentile

Affected Products

VendorProductVersions
LinuxLinux68983a354a655c35d3fb204489d383a2a051fda7, 68983a354a655c35d3fb204489d383a2a051fda7, 68983a354a655c35d3fb204489d383a2a051fda7
linuxlinux_kernel5.7, 5.7, 5.7

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