CVE-2026-89898 (GCVE-0-2026-89898)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:31 – Updated: 2026-09-16 14:39
VLAI
Title
media: cec: extron-da-hd-4k-plus: add sanity check
Summary
In the Linux kernel, the following vulnerability has been resolved: media: cec: extron-da-hd-4k-plus: add sanity check Add check to prevent overflowing msg.msg[] in case the incoming data is malformed.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 056f2821b631df2b94d3b017fd1e1eef918ed98d , < 00c13b4ab481a09d915d099815cff1b10926ddd9 (git)
Affected: 056f2821b631df2b94d3b017fd1e1eef918ed98d , < 673611cc2ab9769929644ce879f7ea34932a3011 (git)
Affected: 056f2821b631df2b94d3b017fd1e1eef918ed98d , < 7ad2fec276946a0dedfa54eb26fc38c4fc6a6034 (git)
Affected: 056f2821b631df2b94d3b017fd1e1eef918ed98d , < abac9820b26b5cfcb01eb79efe2abdd0ac7e07c3 (git)
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Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/cec/usb/extron-da-hd-4k-plus/extron-da-hd-4k-plus.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
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              "status": "affected",
              "version": "056f2821b631df2b94d3b017fd1e1eef918ed98d",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.12"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
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              "version": "6.18.51",
              "versionType": "semver"
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              "version": "7.2.5",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
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                  "vulnerable": true
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: cec: extron-da-hd-4k-plus: add sanity check\n\nAdd check to prevent overflowing msg.msg[] in case the incoming data\nis malformed."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - extron_process_received() hex-decodes Ceci/Ceco lines the Extron DA HD 4K Plus reports from its HDMI ports over USB-serial; a malicious HDMI-CEC source on the same splitter bus (conference-room laptop, signage player) can supply those frames, with a USB gadget impersonating the Extron only an extra physical path.\nAC:L - A crafted Ceci/Ceco line of more than 16 %XX triplets deterministically writes past msg.msg[16]; the attacker fully controls the HDMI-CEC or USB-serial payload, and no race or attacker-uncontrollable memory layout is required.\nPR:N - HDMI-CEC and the Extron USB-serial reports are parsed in extron_interrupt() with no host authentication; an adjacent HDMI device or malicious USB ACM gadget needs no account or capability on the Linux host.\nUI:N - Once the Extron is bound via serport, incoming serial lines are parsed automatically in the interrupt handler; an already-connected HDMI source can trigger the overflow without a victim opening a file or clicking.\nS:U - The overflow corrupts only the host kernel that runs this CEC USB driver and does not cross a VM, IOMMU, or other separate security authority.\nC:H - Attacker-chosen hex bytes are written past the 16-byte on-stack msg.msg[] array (a 256-byte line yields up to ~82 decoded bytes), corrupting kernel stack contents and enabling disclosure of adjacent kernel memory.\nI:H - The same out-of-bounds stores smash the kernel stack frame, including saved control data and the return address, enabling control-flow hijacking and arbitrary kernel writes.\nA:H - Overflowing the on-stack cec_msg produces a kernel oops or panic from stack-canary abort or corrupted control data, so the host can be crashed at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T14:39:47.656Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/00c13b4ab481a09d915d099815cff1b10926ddd9"
        },
        {
          "url": "https://git.kernel.org/stable/c/673611cc2ab9769929644ce879f7ea34932a3011"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ad2fec276946a0dedfa54eb26fc38c4fc6a6034"
        },
        {
          "url": "https://git.kernel.org/stable/c/abac9820b26b5cfcb01eb79efe2abdd0ac7e07c3"
        }
      ],
      "title": "media: cec: extron-da-hd-4k-plus: add sanity check",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89898",
    "datePublished": "2026-09-16T10:31:58.901Z",
    "dateReserved": "2026-09-11T19:38:34.773Z",
    "dateUpdated": "2026-09-16T14:39:47.656Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89898",
      "date": "2026-09-25",
      "epss": "0.00379",
      "percentile": "0.29189"
    },
    "nvd": {
      "cve": {
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                "product": "Linux",
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                  "drivers/media/cec/usb/extron-da-hd-4k-plus/extron-da-hd-4k-plus.c"
                ],
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                ],
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                "vendor": "Linux",
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                    "version": "0",
                    "versionType": "semver"
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                    "versionType": "semver"
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                    "versionType": "semver"
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                    "version": "7.2.5",
                    "versionType": "semver"
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                    "status": "unaffected",
                    "version": "7.3-rc1",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: cec: extron-da-hd-4k-plus: add sanity check\n\nAdd check to prevent overflowing msg.msg[] in case the incoming data\nis malformed."
          }
        ],
        "id": "CVE-2026-89898",
        "lastModified": "2026-09-16T15:18:16.073",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "ADJACENT_NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-09-16T11:16:58.660",
        "references": [
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            "url": "https://git.kernel.org/stable/c/00c13b4ab481a09d915d099815cff1b10926ddd9"
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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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

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.



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.