CVE-2026-99007 (GCVE-0-2026-99007)
Vulnerability from cvelistv5
Published
2026-10-23 12:20
Modified
2026-10-30 12:40
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In 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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: ca91a2758fcef6635626993557dd51cfbb6dd134 Version: ca91a2758fcef6635626993557dd51cfbb6dd134 Version: ca91a2758fcef6635626993557dd51cfbb6dd134 Version: ca91a2758fcef6635626993557dd51cfbb6dd134 Version: ca91a2758fcef6635626993557dd51cfbb6dd134 Version: ca91a2758fcef6635626993557dd51cfbb6dd134 Version: ca91a2758fcef6635626993557dd51cfbb6dd134 Version: ca91a2758fcef6635626993557dd51cfbb6dd134 |
||
{
"containers": {
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"product": "Linux",
"programFiles": [
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"version": "0",
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{
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"version": "5.15.224",
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{
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"status": "unaffected",
"version": "6.1.191",
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{
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{
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"negate": false,
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],
"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-\u003emode/num_connectors for every connected output, and only\nafterwards calls drm_fb_helper_single_fb_probe() to create\nfb_helper-\u003efb 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-\u003edriver-\u003efbdev_probe() itself fails), the function\nbails out before drm_setup_crtcs_fb() runs and before setting\nfb_helper-\u003edeferred_setup. The client is left with mode_sets that\nhave a mode and connectors but mode_set-\u003efb == 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-\u003edeferred_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() -\u003e\ndrm_client_modeset_commit_atomic() -\u003e __drm_atomic_helper_set_config(),\nwhich hits WARN_ON(!set-\u003efb).\n\nMark fb_helper-\u003edeferred_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-\u003efb. The real error code is still returned to the caller\nunchanged."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-30T12:40:51.342Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
],
"title": "drm/fb-helper: defer setup when fbdev_probe() fails, not just on -EAGAIN",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-99007",
"datePublished": "2026-10-23T12:20:32.381Z",
"dateReserved": "2026-09-25T10:25:14.385Z",
"dateUpdated": "2026-10-30T12:40:51.342Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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