CVE-2026-23274High· 7.8▾ TwilightIn 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.…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= 68983a354a655c35d3fb204489d383a2a051fda7 < 32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44Linux >= 68983a354a655c35d3fb204489d383a2a051fda7 < 144f88054ba0180467356f40895bd660b5dceeecLinux >= 68983a354a655c35d3fb204489d383a2a051fda7 < 28c7cfaf0c0ab17cbd7754092116fd1af45271f9Linux >= 68983a354a655c35d3fb204489d383a2a051fda7 < 54080355999381fed4a26129579a5765bab87491Linux >= 68983a354a655c35d3fb204489d383a2a051fda7 < 5e7ece24c5cb75a60402aad4d803c7898ea40aa9Linux >= 68983a354a655c35d3fb204489d383a2a051fda7 < f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1Linux >= 68983a354a655c35d3fb204489d383a2a051fda7 < f228b9ae2a7e84d1153616d8e71c4236cb1f1309Linux >= 68983a354a655c35d3fb204489d383a2a051fda7 < 329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cfLinux 5.7Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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