7.8 High

CVE-2026-23274 In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_IDLETIMER: reject rev0 reuse of…

Description

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 products and versions

Product	Affected versions	Fixed in
Linux 7.0	earliest → < 7.0	7.0
Linux 6.19	earliest → < 6.19.9	6.19.9
Linux 6.18	earliest → < 6.18.19	6.18.19
Linux 6.12	earliest → < 6.12.78	6.12.78
Linux 6.6	earliest → < 6.6.130	6.6.130
Linux 6.1	earliest → < 6.1.167	6.1.167
Linux 5.15	earliest → < 5.15.203	5.15.203
Linux 5.10	earliest → < 5.10.253	5.10.253
Linux	5.7	No fix stated

Show the 4 other branches

Product	Affected versions	Fixed in
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP 3.1	3.1.7 → latest	No fix stated
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 3.1	3.1.7 → latest	No fix stated
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP 3.1	3.1.7 → latest	No fix stated
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem	Versions not published