Canonical Ubuntu Linux 6.8/6.17/7.0 AF Handler null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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3.2$0-$5k0.00

Summaryinfo

A vulnerability was found in Canonical Ubuntu Linux 6.8/6.17/7.0. It has been rated as problematic. Impacted is an unknown function of the component AF Handler. This manipulation causes null pointer dereference. This vulnerability is tracked as CVE-2026-47337. The attack is restricted to local execution. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in Canonical Ubuntu Linux 6.8/6.17/7.0. Affected by this vulnerability is an unknown function of the component AF Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling of AF_INET/AF_INET6 socket mediation. The bug can be triggered by an unprivileged local user. This can lead to a kernel oops.

The weakness was disclosed by Tristan Madani. The advisory is shared at git.launchpad.net. This vulnerability is known as CVE-2026-47337 since 05/19/2026. The exploitation appears to be easy. An attack has to be approached locally. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 321369 (Ubuntu 22.04 LTS : Linux kernel (Azure) vulnerabilities (USN-8440-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.8.0-124.124, 6.17.0-35.35 or 7.0.0-22.22 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.launchpad.net. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (321369). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.3
VulDB Meta Temp Score: 3.2

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.3
CNA Vector (canonical): 🔒

CVSSv2info

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

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 321369
Nessus Name: Ubuntu 22.04 LTS : Linux kernel (Azure) vulnerabilities (USN-8440-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Ubuntu Linux 6.8.0-124.124/6.17.0-35.35/7.0.0-22.22
Patch: git.launchpad.net

Timelineinfo

05/19/2026 CVE reserved
05/28/2026 +9 days Advisory disclosed
05/28/2026 +0 days VulDB entry created
06/19/2026 +22 days VulDB entry last update

Sourcesinfo

Advisory: git.launchpad.net
Researcher: Tristan Madani
Status: Confirmed

CVE: CVE-2026-47337 (🔒)
GCVE (CVE): GCVE-0-2026-47337
GCVE (VulDB): GCVE-100-366877

Entryinfo

Created: 05/28/2026 22:34
Updated: 06/19/2026 17:47
Changes: 05/28/2026 22:34 (67), 06/19/2026 17:47 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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