drm/fb-helper: defer setup when fbdev_probe() fails, not just on -EAGAIN

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-99007
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-23 13:17:23 UTC
Updated2026-10-30 13:21:35 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/fb-helper: defer setup when fbdev_probe() fails, not just on -EAGAIN __drm_fb_helper_initial_config_and_unlock() calls drm_client_modeset_probe() first, which already fills in each mode_set->mode/num_connectors for every connected output, and only afterwards calls drm_fb_helper_single_fb_probe() to create fb_helper->fb and wire it into those mode_sets via drm_setup_crtcs_fb(). If drm_fb_helper_single_fb_probe() fails with anything other than -EAGAIN (e.g. dev->driver->fbdev_probe() itself fails), the function bails out before drm_setup_crtcs_fb() runs and before setting fb_helper->deferred_setup. The client is left with mode_sets that have a mode and connectors but mode_set->fb == NULL, and nothing marks this fb_helper as needing a retry. __drm_fb_helper_restore_fbdev_mode_unlocked() only skips committing when fb_helper->deferred_setup is set, so a later .restore() call (drm_lastclose() on process exit, in this report) commits the stale mode_set through drm_client_modeset_commit() -> drm_client_modeset_commit_atomic() -> __drm_atomic_helper_set_config(), which hits WARN_ON(!set->fb). Mark fb_helper->deferred_setup on any drm_fb_helper_single_fb_probe() failure, not just -EAGAIN, so restore keeps skipping the commit until a later hotplug event successfully re-probes and re-populates mode_set->fb. The real error code is still returned to the caller unchanged.

Risk And Classification

EPSS: 0.001770000 probability, percentile 0.072880000 (date 2026-11-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ca91a2758fcef6635626993557dd51cfbb6dd134 423c871a586cff8b29f48db00e3c45c21d0e8121 git Not specified
CNA Linux Linux affected ca91a2758fcef6635626993557dd51cfbb6dd134 e5f8f6e0f0a18c77c04b757d72319d897a0b4bc1 git Not specified
CNA Linux Linux affected ca91a2758fcef6635626993557dd51cfbb6dd134 9124411cb91b129ff3ffb0d723ecba7a5bf893f9 git Not specified
CNA Linux Linux affected ca91a2758fcef6635626993557dd51cfbb6dd134 4a2006c675758f0c765b36fec6b49d17e89159cf git Not specified
CNA Linux Linux affected ca91a2758fcef6635626993557dd51cfbb6dd134 3b303696f61461b3569019d7fcac6a646652b2b4 git Not specified
CNA Linux Linux affected ca91a2758fcef6635626993557dd51cfbb6dd134 4e7b508c7c60dec7a86b7eb2a1b7e6d174afa457 git Not specified
CNA Linux Linux affected ca91a2758fcef6635626993557dd51cfbb6dd134 d510ed273854177f0a3ed330145858b2fe667f81 git Not specified
CNA Linux Linux affected ca91a2758fcef6635626993557dd51cfbb6dd134 755c94d178b7e972bb766199d34e4ba4f63a89eb git Not specified
CNA Linux Linux affected 4.14 Not specified
CNA Linux Linux unaffected 4.14 semver Not specified
CNA Linux Linux unaffected 5.10.273 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.224 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.191 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.57 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.11 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e5f8f6e0f0a18c77c04b757d72319d897a0b4bc1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4a2006c675758f0c765b36fec6b49d17e89159cf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4e7b508c7c60dec7a86b7eb2a1b7e6d174afa457 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/423c871a586cff8b29f48db00e3c45c21d0e8121 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/755c94d178b7e972bb766199d34e4ba4f63a89eb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3b303696f61461b3569019d7fcac6a646652b2b4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d510ed273854177f0a3ed330145858b2fe667f81 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9124411cb91b129ff3ffb0d723ecba7a5bf893f9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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