CVE-2026-23274 (GCVE-0-2026-23274)
Vulnerability from cvelistv5
Published
2026-03-20 08:08
Modified
2026-04-18 08:57
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 68983a354a655c35d3fb204489d383a2a051fda7
Version: 68983a354a655c35d3fb204489d383a2a051fda7
Version: 68983a354a655c35d3fb204489d383a2a051fda7
Version: 68983a354a655c35d3fb204489d383a2a051fda7
Version: 68983a354a655c35d3fb204489d383a2a051fda7
Version: 68983a354a655c35d3fb204489d383a2a051fda7
Version: 68983a354a655c35d3fb204489d383a2a051fda7
Version: 68983a354a655c35d3fb204489d383a2a051fda7
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels\n\nIDLETIMER revision 0 rules reuse existing timers by label and always call\nmod_timer() on timer-\u003etimer.\n\nIf the label was created first by revision 1 with XT_IDLETIMER_ALARM,\nthe object uses alarm timer semantics and timer-\u003etimer is never initialized.\nReusing that object from revision 0 causes mod_timer() on an uninitialized\ntimer_list, triggering debugobjects warnings and possible panic when\npanic_on_warn=1.\n\nFix this by rejecting revision 0 rule insertion when an existing timer with\nthe same label is of ALARM type."
        }
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            "version": "3.1"
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        "dateUpdated": "2026-04-18T08:57:32.534Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf"
        }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23274",
    "datePublished": "2026-03-20T08:08:54.918Z",
    "dateReserved": "2026-01-13T15:37:45.991Z",
    "dateUpdated": "2026-04-18T08:57:32.534Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2"
}


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