CVE-2026-89821 (GCVE-0-2026-89821)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:30 – Updated: 2026-09-16 10:30
VLAI
Title
drm/amd/display: avoid divide-by-zero in __is_lut_linear()
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: avoid divide-by-zero in __is_lut_linear() __is_lut_linear() computes the expected value of each entry with expected = i * MAX_DRM_LUT_VALUE / (size - 1); If it is ever called with a single-entry LUT, size - 1 is zero and the kernel takes a divide error (#DE). A LUT with fewer than two entries cannot describe a linear mapping anyway, so return false early instead of dividing by zero.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 086247a4b2fba49800b27807f22bb894cd8363fb , < 2320626425f3af3a25b8afb6876f205b1c6d4e64 (git)
Affected: 086247a4b2fba49800b27807f22bb894cd8363fb , < d1e06d5dc8f12451ce71dc068342660a34476084 (git)
Affected: 086247a4b2fba49800b27807f22bb894cd8363fb , < c127ace7af2b40107947a6504391f94d6fd21734 (git)
Affected: 086247a4b2fba49800b27807f22bb894cd8363fb , < 4d5ee095a58461b2446d7a6eb0c14c2fe3eaab44 (git)
Affected: 086247a4b2fba49800b27807f22bb894cd8363fb , < 5f18cd1ba873e751bf5547407ad44ea34adfbe2f (git)
Affected: 086247a4b2fba49800b27807f22bb894cd8363fb , < ee28fafb50f58b847509b5240b431ddec673bdfe (git)
Affected: 086247a4b2fba49800b27807f22bb894cd8363fb , < 15ee43aad0df43dfd1dbb32e7d5b951745c4b87f (git)
Affected: 086247a4b2fba49800b27807f22bb894cd8363fb , < 4f40873f8a4107df2b9c8e68c947c4fd0cd519d2 (git)
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Linux Linux Affected: 4.17
Unaffected: 0 , < 4.17 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: avoid divide-by-zero in __is_lut_linear()\n\n__is_lut_linear() computes the expected value of each entry with\n\n\texpected = i * MAX_DRM_LUT_VALUE / (size - 1);\n\nIf it is ever called with a single-entry LUT, size - 1 is zero and the\nkernel takes a divide error (#DE). A LUT with fewer than two entries\ncannot describe a linear mapping anyway, so return false early instead\nof dividing by zero."
        }
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      "providerMetadata": {
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    "dateReserved": "2026-09-11T19:38:34.768Z",
    "dateUpdated": "2026-09-16T10:30:53.689Z",
    "state": "PUBLISHED"
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      "title": "drm/amd/display: avoid divide-by-zero in __is_lut_linear()",
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        "vulnStatus": "Received"
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    }
  }
}



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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

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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.



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