Linux Kernel up to 6.18.18/6.19.8/7.0-rc3 netfilter mod_timer uninitialized pointer

CVSS Meta Temp Score
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CTI Interest Score
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6.5$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.18.18/6.19.8/7.0-rc3. The impacted element is the function mod_timer of the component netfilter. Performing a manipulation results in uninitialized pointer. This vulnerability is cataloged as CVE-2026-23274. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.18.18/6.19.8/7.0-rc3. This affects the function mod_timer of the component netfilter. The manipulation with an unknown input leads to a uninitialized pointer vulnerability. CWE is classifying the issue as CWE-824. The product accesses or uses a pointer that has not been initialized. The impact remains unknown. The summary by CVE is:

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.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-23274 since 01/13/2026. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/18/2026).

The vulnerability scanner Nessus provides a plugin with the ID 303184 (Linux Distros Unpatched Vulnerability : CVE-2026-23274), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.18.19, 6.19.9 or 7.0-rc4 eliminates this vulnerability. Applying the patch f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1/f228b9ae2a7e84d1153616d8e71c4236cb1f1309/329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (303184), EUVD (EUVD-2026-13610) and CERT Bund (WID-SEC-2026-0809). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Google Cloud Platform
  • Amazon Linux 2
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • Open Source Linux Kernel

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.5

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.8
CNA Vector (Linux): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Uninitialized pointer
CWE: CWE-824 / CWE-908
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 303184
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-23274

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.19/6.19.9/7.0-rc4
Patch: f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1/f228b9ae2a7e84d1153616d8e71c4236cb1f1309/329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf

Timelineinfo

01/13/2026 CVE reserved
03/20/2026 +66 days Advisory disclosed
03/20/2026 +0 days VulDB entry created
06/18/2026 +90 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-23274 (🔒)
GCVE (CVE): GCVE-0-2026-23274
GCVE (VulDB): GCVE-100-352029
EUVD: 🔒
CERT Bund: WID-SEC-2026-0809 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 03/20/2026 09:48
Updated: 06/18/2026 20:23
Changes: 03/20/2026 09:48 (59), 03/20/2026 10:36 (1), 03/20/2026 16:11 (7), 03/23/2026 12:05 (2), 03/26/2026 12:45 (1), 05/04/2026 08:33 (1), 05/23/2026 03:32 (11), 06/18/2026 20:23 (1)
Complete: 🔍
Cache ID: 216::103

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