CVE-2026-99007 (GCVE-0-2026-99007)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:20 – Updated: 2026-10-30 12:40
VLAI
Title
drm/fb-helper: defer setup when fbdev_probe() fails, not just on -EAGAIN
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ca91a2758fcef6635626993557dd51cfbb6dd134 , < 423c871a586cff8b29f48db00e3c45c21d0e8121 (git)
Affected: ca91a2758fcef6635626993557dd51cfbb6dd134 , < e5f8f6e0f0a18c77c04b757d72319d897a0b4bc1 (git)
Affected: ca91a2758fcef6635626993557dd51cfbb6dd134 , < 9124411cb91b129ff3ffb0d723ecba7a5bf893f9 (git)
Affected: ca91a2758fcef6635626993557dd51cfbb6dd134 , < 4a2006c675758f0c765b36fec6b49d17e89159cf (git)
Affected: ca91a2758fcef6635626993557dd51cfbb6dd134 , < 3b303696f61461b3569019d7fcac6a646652b2b4 (git)
Affected: ca91a2758fcef6635626993557dd51cfbb6dd134 , < 4e7b508c7c60dec7a86b7eb2a1b7e6d174afa457 (git)
Affected: ca91a2758fcef6635626993557dd51cfbb6dd134 , < d510ed273854177f0a3ed330145858b2fe667f81 (git)
Affected: ca91a2758fcef6635626993557dd51cfbb6dd134 , < 755c94d178b7e972bb766199d34e4ba4f63a89eb (git)
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Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.2.11 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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          "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."
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            "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."
          }
        ],
        "id": "CVE-2026-99007",
        "lastModified": "2026-10-30T13:21:35.327",
        "metrics": {},
        "published": "2026-10-23T13:17:23.157",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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    "redhat_vex": {
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      "current_release_date": "2026-10-29T07:19:22+00:00",
      "cve": "CVE-2026-99007",
      "id": "CVE-2026-99007",
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      "product_status:known_affected": "236",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/fb-helper: defer setup when fbdev_probe() fails, not just on -EAGAIN",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99007.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-04T17:46:30Z",
      "cve": "CVE-2026-99007",
      "id": "CVE-2026-99007",
      "initial_release_date": "2026-10-27T17:58:25Z",
      "product_status:known_affected": "96",
      "product_status:known_not_affected": "252",
      "product_status:recommended": "65",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-99007",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-99007.json",
      "version": "5"
    }
  }
}



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Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.