CVE-2026-89898 (GCVE-0-2026-89898)
Vulnerability from cvelistv5
Published
2026-09-16 10:31
Modified
2026-10-19 08:54
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 056f2821b631df2b94d3b017fd1e1eef918ed98d
Version: 056f2821b631df2b94d3b017fd1e1eef918ed98d
Version: 056f2821b631df2b94d3b017fd1e1eef918ed98d
Version: 056f2821b631df2b94d3b017fd1e1eef918ed98d
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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"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "00c13b4ab481a09d915d099815cff1b10926ddd9",
              "status": "affected",
              "version": "056f2821b631df2b94d3b017fd1e1eef918ed98d",
              "versionType": "git"
            },
            {
              "lessThan": "673611cc2ab9769929644ce879f7ea34932a3011",
              "status": "affected",
              "version": "056f2821b631df2b94d3b017fd1e1eef918ed98d",
              "versionType": "git"
            },
            {
              "lessThan": "7ad2fec276946a0dedfa54eb26fc38c4fc6a6034",
              "status": "affected",
              "version": "056f2821b631df2b94d3b017fd1e1eef918ed98d",
              "versionType": "git"
            },
            {
              "lessThan": "abac9820b26b5cfcb01eb79efe2abdd0ac7e07c3",
              "status": "affected",
              "version": "056f2821b631df2b94d3b017fd1e1eef918ed98d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/cec/usb/extron-da-hd-4k-plus/extron-da-hd-4k-plus.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "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": "2026-10-19T08:54:31.163Z",
        "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": "2026-10-19T08:54:31.163Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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