{"id":"DEBIAN-CVE-2026-53403","details":"In the Linux kernel, the following vulnerability has been resolved:  fbdev: Fix fb_new_modelist to prevent null-ptr-deref in fb_videomode_to_var  info-\u003evar, a framebuffer's current mode, is expected to have a matching entry in info-\u003emodelist. var_to_display() relies on this and treats a failed fb_match_mode() as \"This should not happen\". fb_set_var() keeps it true by adding the mode to the list on every change, and do_register_framebuffer() does the same at registration.  store_modes() replaces the modelist from userspace. fb_new_modelist() validates the new modes but does not check that info-\u003evar still has a match. It relies on fbcon_new_modelist() to re-point consoles, but that only handles consoles mapped to the framebuffer. With fbcon unbound there are none, so info-\u003evar is left describing a mode that is no longer in the list.  A later console takeover runs var_to_display(), where fb_match_mode() returns NULL and leaves fb_display[i].mode NULL. fbcon_switch() passes it to display_to_var(), and fb_videomode_to_var() dereferences the NULL mode.  Keep the current mode in the list in fb_new_modelist(), the same way fb_set_var() does.","modified":"2026-09-01T16:06:50.307351041Z","published":"2026-07-19T12:16:51.510Z","upstream":["CVE-2026-53403"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-53403"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.177-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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