CVE-2026-23274

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux68983a354a655c35d3fb204489d383a2a051fda7 < 32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44affected
LinuxLinux68983a354a655c35d3fb204489d383a2a051fda7 < 144f88054ba0180467356f40895bd660b5dceeecaffected
LinuxLinux68983a354a655c35d3fb204489d383a2a051fda7 < 28c7cfaf0c0ab17cbd7754092116fd1af45271f9affected
LinuxLinux68983a354a655c35d3fb204489d383a2a051fda7 < 54080355999381fed4a26129579a5765bab87491affected
LinuxLinux68983a354a655c35d3fb204489d383a2a051fda7 < 5e7ece24c5cb75a60402aad4d803c7898ea40aa9affected
LinuxLinux68983a354a655c35d3fb204489d383a2a051fda7 < f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1affected
LinuxLinux68983a354a655c35d3fb204489d383a2a051fda7 < f228b9ae2a7e84d1153616d8e71c4236cb1f1309affected
LinuxLinux68983a354a655c35d3fb204489d383a2a051fda7 < 329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cfaffected
LinuxLinux5.7affected
LinuxLinux0 < 5.7unaffected
LinuxLinux5.10.253 <= 5.10.*unaffected
LinuxLinux5.15.203 <= 5.15.*unaffected
LinuxLinux6.1.167 <= 6.1.*unaffected
LinuxLinux6.6.130 <= 6.6.*unaffected
LinuxLinux6.12.78 <= 6.12.*unaffected
LinuxLinux6.18.19 <= 6.18.*unaffected
LinuxLinux6.19.9 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References