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CVE-2021-47108 (GCVE-0-2021-47108)

Vulnerability from cvelistv5 – Published: 2024-03-04 18:15 – Updated: 2026-05-11 13:48
VLAI
Title
drm/mediatek: hdmi: Perform NULL pointer check for mtk_hdmi_conf
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: hdmi: Perform NULL pointer check for mtk_hdmi_conf In commit 41ca9caaae0b ("drm/mediatek: hdmi: Add check for CEA modes only") a check for CEA modes was added to function mtk_hdmi_bridge_mode_valid() in order to address possible issues on MT8167; moreover, with commit c91026a938c2 ("drm/mediatek: hdmi: Add optional limit on maximal HDMI mode clock") another similar check was introduced. Unfortunately though, at the time of writing, MT8173 does not provide any mtk_hdmi_conf structure and this is crashing the kernel with NULL pointer upon entering mtk_hdmi_bridge_mode_valid(), which happens as soon as a HDMI cable gets plugged in. To fix this regression, add a NULL pointer check for hdmi->conf in the said function, restoring HDMI functionality and avoiding NULL pointer kernel panics.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-26 20:37 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 41ca9caaae0bfc959b22dbcd59d88a7107707e17 , < 71d07ebc5000b9c1d140e99e7493b0bafa954776 (git)
Affected: 41ca9caaae0bfc959b22dbcd59d88a7107707e17 , < 3b8e19a0aa3933a785be9f1541afd8d398c4ec69 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.15.12 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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      "title": "kernel: drm/mediatek: hdmi: Perform NULL pointer check for mtk_hdmi_conf",
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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47108.json",
      "version": "49"
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          "title": "drm/mediatek: hdmi: Perform NULL pointer check for mtk_hdmi_conf",
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        "cveId": "CVE-2021-47108",
        "datePublished": "2024-03-04T18:15:40.883Z",
        "dateReserved": "2024-03-04T18:12:48.835Z",
        "dateUpdated": "2024-12-19T07:35:23.633Z",
        "state": "PUBLISHED"
      },
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    }
  }
}



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Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.


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.