{"id":"CVE-2026-74424","title":"fbcon: fix NULL pointer dereference for a console without vc_data","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nfbcon: fix NULL pointer dereference for a console without vc_data\n\nfbcon_new_modelist() runs when a framebuffer's modelist changes. For each\nconsole mapped to it with f…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < 8e9b8b008f4036df0318870c5d754134ff1b94cc","Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < cc4382dc5134826a3936a6b08de17f7dc7abe232","Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < 9b783b7e03dc78ec102edf618259a2b55911fc6a","Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < ac970358c5ca0775841bd2a56ce15dc464b99003","Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < 6617df8c246311c82cebf061a4cee55b9df60922","Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < b134ad2f7c06b3c1098dcc95008e2045ff4b49b2","Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < 5fae9a928482d4845bca169a3a098789203a1ca4","Linux 2.6.23"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:57:14.998787Z"},"published":"2026-08-15","updated":"2026-11-06","sourceUpdated":"2026-11-06T17:05:45.733Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74424","references":[{"url":"https://git.kernel.org/stable/c/8e9b8b008f4036df0318870c5d754134ff1b94cc"},{"url":"https://git.kernel.org/stable/c/cc4382dc5134826a3936a6b08de17f7dc7abe232"},{"url":"https://git.kernel.org/stable/c/9b783b7e03dc78ec102edf618259a2b55911fc6a"},{"url":"https://git.kernel.org/stable/c/ac970358c5ca0775841bd2a56ce15dc464b99003"},{"url":"https://git.kernel.org/stable/c/6617df8c246311c82cebf061a4cee55b9df60922"},{"url":"https://git.kernel.org/stable/c/b134ad2f7c06b3c1098dcc95008e2045ff4b49b2"},{"url":"https://git.kernel.org/stable/c/5fae9a928482d4845bca169a3a098789203a1ca4"}],"tags":["cve.org"],"epss":0.00161,"epssPercentile":0.05341,"ingestedAt":"2026-11-06T18:00:12.558Z","slug":"CVE-2026-74424","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nfbcon: fix NULL pointer dereference for a console without vc_data\n\nfbcon_new_modelist() runs when a framebuffer's modelist changes. For each\nconsole mapped to it with fb_display[i].mode set, it reads vc_cons[i].d and\npasses the vc_num to fbcon_set_disp(). This assumes a console with a mode\nset has a vc_data, but it can be NULL. fbcon_set_disp() sets\nfb_display[i].mode before it checks vc_data, and fbcon_deinit() leaves the\nmode set after the vc_data is freed. fbcon_new_modelist() then dereferences\nthe NULL vc_data.\n\nKeep fb_display[i].mode set only while the console has a vc_data. Check\nvc_data before setting the mode in fbcon_set_disp(), and clear the mode in\nfbcon_deinit(). The existing mode check in fbcon_new_modelist() then skips\nsuch consoles.\n\n## Affected\n\n- `Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < 8e9b8b008f4036df0318870c5d754134ff1b94cc`\n- `Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < cc4382dc5134826a3936a6b08de17f7dc7abe232`\n- `Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < 9b783b7e03dc78ec102edf618259a2b55911fc6a`\n- `Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < ac970358c5ca0775841bd2a56ce15dc464b99003`\n- `Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < 6617df8c246311c82cebf061a4cee55b9df60922`\n- `Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < b134ad2f7c06b3c1098dcc95008e2045ff4b49b2`\n- `Linux >= d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e < 5fae9a928482d4845bca169a3a098789203a1ca4`\n- `Linux 2.6.23`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}