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CVE-2026-23274

netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 68983a354a655c35d3fb204489d383a2a051fda7 · fixed in 32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44; From 68983a354a655c35d3fb204489d383a2a051fda7 · fixed in 144f88054ba0180467356f40895bd660b5dceeec; From 68983a354a655c35d3fb204489d383a2a051fda7 · fixed in 28c7cfaf0c0ab17cbd7754092116fd1af45271f9; From 68983a354a655c35d3fb204489d383a2a051fda7 · fixed in 54080355999381fed4a26129579a5765bab87491; From 68983a354a655c35d3fb204489d383a2a051fda7 · fixed in 5e7ece24c5cb75a60402aad4d803c7898ea40aa9; From 68983a354a655c35d3fb204489d383a2a051fda7 · fixed in f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1; From 68983a354a655c35d3fb204489d383a2a051fda7 · fixed in f228b9ae2a7e84d1153616d8e71c4236cb1f1309; From 68983a354a655c35d3fb204489d383a2a051fda7 · fixed in 329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf

  • Linux Linux

    5.7

  • KernelLinux

    From 5.7.0 · fixed in 5.10.253; From 5.11.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.167; From 6.2.0 · fixed in 6.6.130; From 6.7.0 · fixed in 6.12.78; From 6.13.0 · fixed in 6.18.19; From 6.19.0 · fixed in 6.19.9

References 8

git.kernel.org