CVE-2026-74424
In the Linux kernel, the following vulnerability has been resolved: fbcon: fix NULL pointer dereference for a console without vc_data fbcon_new_modelist() runs when a framebuffer's modelist changes. For each console mapped to it with fb_display[i].mode set, it reads vc_cons[i].d and passes the vc_num to fbcon_set_disp(). This assumes a console with a mode set has a vc_data, but it can be NULL. fbcon_set_disp() sets fb_display[i].mode before it checks vc_data, and fbcon_deinit() leaves the mode set after the vc_data is freed. fbcon_new_modelist() then dereferences the NULL vc_data. Keep fb_display[i].mode set only while the console has a vc_data. Check vc_data before setting the mode in fbcon_set_disp(), and clear the mode in fbcon_deinit(). The existing mode check in fbcon_new_modelist() then skips such consoles.
Affected versions
Linux kernel versions
2.6.23
and later are affected. Fixed in
5.15.212,
6.1.178,
6.6.145,
6.12.97,
6.18.40,
7.1.5,
7.2
and their respective stable series.
References
7 totalFrequently asked questions
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What is CVE-2026-74424?
CVE-2026-74424 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 2.6.23 onward and has been patched in 5.15.212, 6.1.178, 6.6.145 and others. CVE-2026-74424 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-74424?
Yes. CVE-2026-74424 has been patched. Fixed versions include 5.15.212, 6.1.178, 6.6.145 and others. If you are running Linux kernel 2.6.23 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-74424 actively exploited?
No. CVE-2026-74424 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.