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.
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade python3-perfUpgrade kernel-debuginfo-common-aarch64Upgrade bpftoolUpgrade kernel-modules-extra-commonUpgrade perfUpgrade kernel-tools-develUpgrade kernel-develUpgrade kernel-livepatch-6.1.180-225.360Upgrade bpftool-debuginfoUpgrade kernel-toolsUpgrade python3-perf-debuginfoUpgrade kernel-debuginfoUpgrade kernelUpgrade kernel-debuginfo-common-x86_64Upgrade perf-debuginfoUpgrade kernel-headersUpgrade kernel-modules-extraUpgrade kernel-tools-debuginfo | Sep 1, 2026 | Aug 15, 2026 |
| Debian | — | Upgrade linux | Aug 16, 2026 | Aug 16, 2026 |
| Redhat_linux | — | No solution exists | Aug 24, 2026 | Aug 15, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 21, 2026 | Aug 15, 2026 |
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