CVE-2026-23274 (GCVE-0-2026-23274)
Vulnerability from cvelistv5
Published
2026-03-20 08:08
Modified
2026-10-19 18:35
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 68983a354a655c35d3fb204489d383a2a051fda7
Version: 68983a354a655c35d3fb204489d383a2a051fda7
Version: 68983a354a655c35d3fb204489d383a2a051fda7
Version: 68983a354a655c35d3fb204489d383a2a051fda7
Version: 68983a354a655c35d3fb204489d383a2a051fda7
Version: 68983a354a655c35d3fb204489d383a2a051fda7
Version: 68983a354a655c35d3fb204489d383a2a051fda7
Version: 68983a354a655c35d3fb204489d383a2a051fda7
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It\u0027s a standard kernel privilege escalation scenario.\\nC:H - The bug calls mod_timer() on an uninitialized timer_list from kmalloc\u0027d memory. Since kmalloc does not zero memory, the timer_list contains stale heap content which an attacker can influence via heap spraying, potentially achieving arbitrary read through controlled function pointers and timer wheel manipulation.\\nI:H - Operating mod_timer() on a timer_list with attacker-influenced stale heap data (uninitialized function pointer, hlist_node entries) can corrupt timer wheel data structures and potentially achieve arbitrary code execution if the function pointer is controlled through heap spraying.\\nA:H - At minimum, mod_timer() on uninitialized memory triggers debug_assert_init() WARN which causes panic with panic_on_warn=1. 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  }
}


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