CVE-2026-23274
Full vulnerability record from the local CVENow database.
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.
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-03-20 09:16:13.077000
Last modified
2026-10-19 19:17:44.930000
View original CVE JSON
{
"id": "CVE-2026-23274",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-03-20T09:16:13.077",
"lastModified": "2026-10-19T19:17:44.930",
"vulnStatus": "Modified",
"cveTags": [],
"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->timer.\n\nIf the label was created first by revision 1 with XT_IDLETIMER_ALARM,\nthe object uses alarm timer semantics and timer->timer 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."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: xt_IDLETIMER: rechazar la reutilización de rev0 de etiquetas de temporizador ALARM\n\nLas reglas de la revisión 0 de IDLETIMER reutilizan temporizadores existentes por etiqueta y siempre llaman a mod_timer() en timer->timer.\n\nSi la etiqueta fue creada primero por la revisión 1 con XT_IDLETIMER_ALARM, el objeto utiliza semántica de temporizador de alarma y timer->timer nunca se inicializa. Reutilizar ese objeto de la revisión 0 causa mod_timer() en una timer_list no inicializada, lo que activa advertencias de debugobjects y un posible pánico cuando panic_on_warn=1.\n\nSolucione esto rechazando la inserción de reglas de la revisión 0 cuando un temporizador existente con la misma etiqueta es de tipo ALARM."
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