Bug 2467067 (CVE-2026-43123)

Summary: CVE-2026-43123 kernel: fbcon: check return value of con2fb_acquire_newinfo()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the fbcon component of the Linux kernel. A local user could exploit a missing return value check in the con2fb_acquire_newinfo() function. This oversight can lead to a null pointer dereference, potentially causing a system crash and resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-05-06 13:02:30 UTC 
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.
Comment 1 Keith Grant 2026-05-06 17:36:29 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050618-CVE-2026-43123-1166@gregkh/T