{"id":"CVE-2026-99007","state":"PUBLISHED","title":"drm/fb-helper: defer setup when fbdev_probe() fails, not just on -EAGAIN","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/fb-helper: defer setup when fbdev_probe() fails, not just on -EAGAIN\n\n__drm_fb_helper_initial_config_and_unlock() calls\ndrm_client_modeset_probe() first, which already fills in each\nmode_set->mode/num_connectors for every connected output, and only\nafterwards calls drm_fb_helper_single_fb_probe() to create\nfb_helper->fb and wire it into those mode_sets via\ndrm_setup_crtcs_fb().\n\nIf drm_fb_helper_single_fb_probe() fails with anything other than\n-EAGAIN (e.g. dev->driver->fbdev_probe() itself fails), the function\nbails out before drm_setup_crtcs_fb() runs and before setting\nfb_helper->deferred_setup. The client is left with mode_sets that\nhave a mode and connectors but mode_set->fb == NULL, and nothing\nmarks this fb_helper as needing a retry.\n\n__drm_fb_helper_restore_fbdev_mode_unlocked() only skips committing\nwhen fb_helper->deferred_setup is set, so a later .restore() call\n(drm_lastclose() on process exit, in this report) commits the stale\nmode_set through drm_client_modeset_commit() ->\ndrm_client_modeset_commit_atomic() -> __drm_atomic_helper_set_config(),\nwhich hits WARN_ON(!set->fb).\n\nMark fb_helper->deferred_setup on any drm_fb_helper_single_fb_probe()\nfailure, not just -EAGAIN, so restore keeps skipping the commit until\na later hotplug event successfully re-probes and re-populates\nmode_set->fb. The real error code is still returned to the caller\nunchanged.","publishedAt":"2026-10-23T12:20:32.381Z","updatedAt":"2026-10-30T12:40:51.342Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","status":"affected","lessThan":"423c871a586cff8b29f48db00e3c45c21d0e8121","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","status":"affected","lessThan":"e5f8f6e0f0a18c77c04b757d72319d897a0b4bc1","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","status":"affected","lessThan":"9124411cb91b129ff3ffb0d723ecba7a5bf893f9","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","status":"affected","lessThan":"4a2006c675758f0c765b36fec6b49d17e89159cf","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","status":"affected","lessThan":"3b303696f61461b3569019d7fcac6a646652b2b4","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","status":"affected","lessThan":"4e7b508c7c60dec7a86b7eb2a1b7e6d174afa457","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","status":"affected","lessThan":"d510ed273854177f0a3ed330145858b2fe667f81","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","status":"affected","lessThan":"755c94d178b7e972bb766199d34e4ba4f63a89eb","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/drm_fb_helper.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.14","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.11","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/drm_fb_helper.c"]}],"references":["https://git.kernel.org/stable/c/423c871a586cff8b29f48db00e3c45c21d0e8121","https://git.kernel.org/stable/c/e5f8f6e0f0a18c77c04b757d72319d897a0b4bc1","https://git.kernel.org/stable/c/9124411cb91b129ff3ffb0d723ecba7a5bf893f9","https://git.kernel.org/stable/c/4a2006c675758f0c765b36fec6b49d17e89159cf","https://git.kernel.org/stable/c/3b303696f61461b3569019d7fcac6a646652b2b4","https://git.kernel.org/stable/c/4e7b508c7c60dec7a86b7eb2a1b7e6d174afa457","https://git.kernel.org/stable/c/d510ed273854177f0a3ed330145858b2fe667f81","https://git.kernel.org/stable/c/755c94d178b7e972bb766199d34e4ba4f63a89eb"],"weaknesses":[],"ingestedAt":"2026-10-30T13:00:06.648Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/99xxx/CVE-2026-99007.json","commit":"cb14bf1b43b0c9f05f7f40eae2246263fd430780","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99007","state":"PUBLISHED","datePublished":"2026-10-23T12:20:32.381Z","dateUpdated":"2026-10-30T12:40:51.342Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.385Z"},"containers":{"cna":{"title":"drm/fb-helper: defer setup when fbdev_probe() fails, not just on -EAGAIN","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/fb-helper: defer setup when fbdev_probe() fails, not just on -EAGAIN\n\n__drm_fb_helper_initial_config_and_unlock() calls\ndrm_client_modeset_probe() first, which already fills in each\nmode_set->mode/num_connectors for every connected output, and only\nafterwards calls drm_fb_helper_single_fb_probe() to create\nfb_helper->fb and wire it into those mode_sets via\ndrm_setup_crtcs_fb().\n\nIf drm_fb_helper_single_fb_probe() fails with anything other than\n-EAGAIN (e.g. dev->driver->fbdev_probe() itself fails), the function\nbails out before drm_setup_crtcs_fb() runs and before setting\nfb_helper->deferred_setup. The client is left with mode_sets that\nhave a mode and connectors but mode_set->fb == NULL, and nothing\nmarks this fb_helper as needing a retry.\n\n__drm_fb_helper_restore_fbdev_mode_unlocked() only skips committing\nwhen fb_helper->deferred_setup is set, so a later .restore() call\n(drm_lastclose() on process exit, in this report) commits the stale\nmode_set through drm_client_modeset_commit() ->\ndrm_client_modeset_commit_atomic() -> __drm_atomic_helper_set_config(),\nwhich hits WARN_ON(!set->fb).\n\nMark fb_helper->deferred_setup on any drm_fb_helper_single_fb_probe()\nfailure, not just -EAGAIN, so restore keeps skipping the commit until\na later hotplug event successfully re-probes and re-populates\nmode_set->fb. The real error code is still returned to the caller\nunchanged."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","status":"affected","lessThan":"423c871a586cff8b29f48db00e3c45c21d0e8121","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","status":"affected","lessThan":"e5f8f6e0f0a18c77c04b757d72319d897a0b4bc1","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","status":"affected","lessThan":"9124411cb91b129ff3ffb0d723ecba7a5bf893f9","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","status":"affected","lessThan":"4a2006c675758f0c765b36fec6b49d17e89159cf","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","status":"affected","lessThan":"3b303696f61461b3569019d7fcac6a646652b2b4","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","status":"affected","lessThan":"4e7b508c7c60dec7a86b7eb2a1b7e6d174afa457","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","status":"affected","lessThan":"d510ed273854177f0a3ed330145858b2fe667f81","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","status":"affected","lessThan":"755c94d178b7e972bb766199d34e4ba4f63a89eb","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/drm_fb_helper.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.14","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.11","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/drm_fb_helper.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/423c871a586cff8b29f48db00e3c45c21d0e8121"},{"url":"https://git.kernel.org/stable/c/e5f8f6e0f0a18c77c04b757d72319d897a0b4bc1"},{"url":"https://git.kernel.org/stable/c/9124411cb91b129ff3ffb0d723ecba7a5bf893f9"},{"url":"https://git.kernel.org/stable/c/4a2006c675758f0c765b36fec6b49d17e89159cf"},{"url":"https://git.kernel.org/stable/c/3b303696f61461b3569019d7fcac6a646652b2b4"},{"url":"https://git.kernel.org/stable/c/4e7b508c7c60dec7a86b7eb2a1b7e6d174afa457"},{"url":"https://git.kernel.org/stable/c/d510ed273854177f0a3ed330145858b2fe667f81"},{"url":"https://git.kernel.org/stable/c/755c94d178b7e972bb766199d34e4ba4f63a89eb"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:40:51.342Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"7.2.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}