Linux Kernel up to 6.19.5 con2fb_acquire_newinfo null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.19.5. It has been rated as critical. This issue affects the function con2fb_acquire_newinfo. Performing a manipulation results in null pointer dereference. This vulnerability is identified as CVE-2026-43123. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.19.5. This affects the function con2fb_acquire_newinfo. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: fbcon: check return value of con2fb_acquire_newinfo() If fbcon_open() fails when called from con2fb_acquire_newinfo() then info->fbcon_par pointer remains NULL which is later dereferenced. Add check for return value of the function con2fb_acquire_newinfo() to avoid it. Found by Linux Verification Center (linuxtesting.org) with SVACE.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-43123 since 05/01/2026. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 318589 (Oracle Linux 10 / 9 : Unbreakable Enterprise kernel (ELSA-2026-50293)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.15.203, 6.1.165, 6.6.128, 6.12.75, 6.18.16 or 6.19.6 eliminates this vulnerability. Applying the patch d3e535533767c85788529e626478718b7e95a59f/3b5a754ec86bc6064af9aca76eb191c2405e6b0c/a785c4e2a999c2d51dfcf40d317cfb30cc735d2c/0b038c0be6827dd2dbb1ce4f8d92d97c80cbe9cc/11a93180a70bb3095a9bd80d113d9277e30d9959/f57b61624c86ef8f87f6e6b7dd0755de03d90e89/011a0502801c8536f64141a2b61362c14f456544 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 (318589) and CERT Bund (WID-SEC-2026-1405). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Microsoft Azure Linux
  • Open Source Linux Kernel
  • Proxmox Virtual Environment

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

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: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 318589
Nessus Name: Oracle Linux 10 / 9 : Unbreakable Enterprise kernel (ELSA-2026-50293)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.15.203/6.1.165/6.6.128/6.12.75/6.18.16/6.19.6
Patch: d3e535533767c85788529e626478718b7e95a59f/3b5a754ec86bc6064af9aca76eb191c2405e6b0c/a785c4e2a999c2d51dfcf40d317cfb30cc735d2c/0b038c0be6827dd2dbb1ce4f8d92d97c80cbe9cc/11a93180a70bb3095a9bd80d113d9277e30d9959/f57b61624c86ef8f87f6e6b7dd0755de03d90e89/011a0502801c8536f64141a2b61362c14f456544

Timelineinfo

05/01/2026 CVE reserved
05/06/2026 +5 days Advisory disclosed
05/06/2026 +0 days VulDB entry created
07/23/2026 +78 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-43123 (🔒)
GCVE (CVE): GCVE-0-2026-43123
GCVE (VulDB): GCVE-100-361431
CERT Bund: WID-SEC-2026-1405 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 05/06/2026 16:42
Updated: 07/23/2026 03:45
Changes: 05/06/2026 16:42 (58), 05/18/2026 14:52 (7), 06/04/2026 14:29 (2), 07/23/2026 03:45 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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