Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

Go to Calendar     Go to Press Room     Go to Newsletters subscription

Search

CVE-2026-23274

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
20/03/2026
Last modified:
18/04/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels<br /> <br /> IDLETIMER revision 0 rules reuse existing timers by label and always call<br /> mod_timer() on timer-&gt;timer.<br /> <br /> If the label was created first by revision 1 with XT_IDLETIMER_ALARM,<br /> the object uses alarm timer semantics and timer-&gt;timer is never initialized.<br /> Reusing that object from revision 0 causes mod_timer() on an uninitialized<br /> timer_list, triggering debugobjects warnings and possible panic when<br /> panic_on_warn=1.<br /> <br /> Fix this by rejecting revision 0 rule insertion when an existing timer with<br /> the same label is of ALARM type.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
7.80
Severity 3.x
HIGH

References to Advisories, Solutions, and Tools