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
linux: linux kernel
References10
- git.kernel.org/stable/c/144f88054ba0180467356f40895bd660b5dceeec Patch
- git.kernel.org/stable/c/28c7cfaf0c0ab17cbd7754092116fd1af45271f9 Patch
- git.kernel.org/stable/c/329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf Patch
- git.kernel.org/stable/c/32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44 Patch
- git.kernel.org/stable/c/54080355999381fed4a26129579a5765bab87491 Patch
- git.kernel.org/stable/c/5e7ece24c5cb75a60402aad4d803c7898ea40aa9 Patch
- git.kernel.org/stable/c/f228b9ae2a7e84d1153616d8e71c4236cb1f1309 Patch
- git.kernel.org/stable/c/f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1 Patch
- cert-portal.siemens.com/productcert/html/ssa-019113.html
- cert-portal.siemens.com/productcert/html/ssa-082556.html
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 8 · as of 12 November 2026
- CWE
- CWE-758
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.