CVE-2026-23274

Advisory lineage Upstream: 0 Downstream: 44
Analyzed
Published: 20 Mar 2026, 08:08
Last modified:14 Jul 2026, 12:46

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (cve.org)
EPSS Score
0.12% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

20 Mar 2026, 08:08
Published
Vulnerability first disclosed
14 Jul 2026, 12:46
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.12%• Percentile: 2%

Affected Systems

  • linux•linux

    ≥ 68983a354a655c35d3fb204489d383a2a051fda7, < 32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44 | ≥ 68983a354a655c35d3fb204489d383a2a051fda7, < 144f88054ba0180467356f40895bd660b5dceeec | ≥ 68983a354a655c35d3fb204489d383a2a051fda7, < 28c7cfaf0c0ab17cbd7754092116fd1af45271f9 | ≥ 68983a354a655c35d3fb204489d383a2a051fda7, < 54080355999381fed4a26129579a5765bab87491 | ≥ 68983a354a655c35d3fb204489d383a2a051fda7, < 5e7ece24c5cb75a60402aad4d803c7898ea40aa9 | ≥ 68983a354a655c35d3fb204489d383a2a051fda7, < f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1 | ≥ 68983a354a655c35d3fb204489d383a2a051fda7, < f228b9ae2a7e84d1153616d8e71c4236cb1f1309 | ≥ 68983a354a655c35d3fb204489d383a2a051fda7, < 329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf | 5.7

  • linux•linux kernel

    ≥ 5.7, < 5.10.253 | ≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.167 | ≥ 6.2, < 6.6.130 | ≥ 6.7, < 6.12.78 | ≥ 6.13, < 6.18.19 | ≥ 6.19, < 6.19.9 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3

References (10)