{"schema":"threatline.record/2","record":{"id":"CVE-2026-99007","aliases":[],"summary":"drm/fb-helper: defer setup when fbdev_probe() fails, not just on -EAGAIN","details":"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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99007","source_modified_at":"2026-10-23T12:20:32.381Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","lessThan":"4a2006c675758f0c765b36fec6b49d17e89159cf","status":"affected","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","lessThan":"3b303696f61461b3569019d7fcac6a646652b2b4","status":"affected","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","lessThan":"4e7b508c7c60dec7a86b7eb2a1b7e6d174afa457","status":"affected","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","lessThan":"d510ed273854177f0a3ed330145858b2fe667f81","status":"affected","versionType":"git"},{"version":"ca91a2758fcef6635626993557dd51cfbb6dd134","lessThan":"755c94d178b7e972bb766199d34e4ba4f63a89eb","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99007","source_modified_at":"2026-10-23T12:20:32.381Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"4.14","status":"affected"},{"version":"0","lessThan":"4.14","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.113","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.57","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.11","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99007","source_modified_at":"2026-10-23T12:20:32.381Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"4a2006c675758f0c765b36fec6b49d17e89159cf","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99007","source_modified_at":"2026-10-23T12:20:32.381Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"3b303696f61461b3569019d7fcac6a646652b2b4","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99007","source_modified_at":"2026-10-23T12:20:32.381Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"4e7b508c7c60dec7a86b7eb2a1b7e6d174afa457","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99007","source_modified_at":"2026-10-23T12:20:32.381Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"755c94d178b7e972bb766199d34e4ba4f63a89eb","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-23T12:20:32.381Z","modified_at":"2026-10-23T12:20:32.381Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-99007","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T12:20:32.381Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/4a2006c675758f0c765b36fec6b49d17e89159cf"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/3b303696f61461b3569019d7fcac6a646652b2b4"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/4e7b508c7c60dec7a86b7eb2a1b7e6d174afa457"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/d510ed273854177f0a3ed330145858b2fe667f81"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/755c94d178b7e972bb766199d34e4ba4f63a89eb"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-23T12:20:32.381Z","content_hash":"84e14169ec7053b0b75d30928bc5ab4615776b147951bb4de863f8f58bb622ee"}}