What’s Vulnerable › Vulnerabilities

CVE-2026-43123: fbcon: check return value of con2fb_acquire_newinfo()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-06 · updated 2026-06-17
• Weakness: CWE-476

Description

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.

Affected products

• Linux kernel: from 2.6.23 before 5.15.203; from 5.16 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.16; from 6.19 before 6.19.6 — fixed in 5.15.203, 6.1.165, 6.12.75, 6.18.16, 6.19.6, 6.6.128

How to fix

Upgrade to a fixed version: Linux kernel 5.15.203, 6.1.165, 6.12.75, 6.18.16. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/011a0502801c8536f64141a2b61362c14f456544
• https://git.kernel.org/stable/c/0b038c0be6827dd2dbb1ce4f8d92d97c80cbe9cc
• https://git.kernel.org/stable/c/11a93180a70bb3095a9bd80d113d9277e30d9959
• https://git.kernel.org/stable/c/3b5a754ec86bc6064af9aca76eb191c2405e6b0c
• https://git.kernel.org/stable/c/a785c4e2a999c2d51dfcf40d317cfb30cc735d2c
• https://git.kernel.org/stable/c/d3e535533767c85788529e626478718b7e95a59f
• https://git.kernel.org/stable/c/f57b61624c86ef8f87f6e6b7dd0755de03d90e89

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