{"id":"CVE-2026-74424","state":"PUBLISHED","title":"fbcon: fix NULL pointer dereference for a console without vc_data","description":"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 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.","publishedAt":"2026-08-15T05:59:27.179Z","updatedAt":"2026-08-18T06:56:33.340Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e","status":"affected","lessThan":"8e9b8b008f4036df0318870c5d754134ff1b94cc","versionType":"git"},{"version":"d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e","status":"affected","lessThan":"cc4382dc5134826a3936a6b08de17f7dc7abe232","versionType":"git"},{"version":"d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e","status":"affected","lessThan":"9b783b7e03dc78ec102edf618259a2b55911fc6a","versionType":"git"},{"version":"d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e","status":"affected","lessThan":"ac970358c5ca0775841bd2a56ce15dc464b99003","versionType":"git"},{"version":"d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e","status":"affected","lessThan":"6617df8c246311c82cebf061a4cee55b9df60922","versionType":"git"},{"version":"d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e","status":"affected","lessThan":"b134ad2f7c06b3c1098dcc95008e2045ff4b49b2","versionType":"git"},{"version":"d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e","status":"affected","lessThan":"5fae9a928482d4845bca169a3a098789203a1ca4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/video/fbdev/core/fbcon.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.23","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.23","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/video/fbdev/core/fbcon.c"]}],"references":["https://git.kernel.org/stable/c/8e9b8b008f4036df0318870c5d754134ff1b94cc","https://git.kernel.org/stable/c/cc4382dc5134826a3936a6b08de17f7dc7abe232","https://git.kernel.org/stable/c/9b783b7e03dc78ec102edf618259a2b55911fc6a","https://git.kernel.org/stable/c/ac970358c5ca0775841bd2a56ce15dc464b99003","https://git.kernel.org/stable/c/6617df8c246311c82cebf061a4cee55b9df60922","https://git.kernel.org/stable/c/b134ad2f7c06b3c1098dcc95008e2045ff4b49b2","https://git.kernel.org/stable/c/5fae9a928482d4845bca169a3a098789203a1ca4"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74424.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74424","state":"PUBLISHED","datePublished":"2026-08-15T05:59:27.179Z","dateUpdated":"2026-08-18T06:56:33.340Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.894Z"},"containers":{"cna":{"title":"fbcon: fix NULL pointer dereference for a console without vc_data","descriptions":[{"lang":"en","value":"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 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e","status":"affected","lessThan":"8e9b8b008f4036df0318870c5d754134ff1b94cc","versionType":"git"},{"version":"d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e","status":"affected","lessThan":"cc4382dc5134826a3936a6b08de17f7dc7abe232","versionType":"git"},{"version":"d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e","status":"affected","lessThan":"9b783b7e03dc78ec102edf618259a2b55911fc6a","versionType":"git"},{"version":"d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e","status":"affected","lessThan":"ac970358c5ca0775841bd2a56ce15dc464b99003","versionType":"git"},{"version":"d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e","status":"affected","lessThan":"6617df8c246311c82cebf061a4cee55b9df60922","versionType":"git"},{"version":"d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e","status":"affected","lessThan":"b134ad2f7c06b3c1098dcc95008e2045ff4b49b2","versionType":"git"},{"version":"d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e","status":"affected","lessThan":"5fae9a928482d4845bca169a3a098789203a1ca4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/video/fbdev/core/fbcon.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.23","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.23","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/video/fbdev/core/fbcon.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-18T06:56:33.340Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.23","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}