{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89898", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.773Z", "datePublished": "2026-09-16T10:31:58.901Z", "dateUpdated": "2026-09-16T14:39:47.656Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-16T14:39:47.656Z"}, "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": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/media/cec/usb/extron-da-hd-4k-plus/extron-da-hd-4k-plus.c"], "versions": [{"version": "056f2821b631df2b94d3b017fd1e1eef918ed98d", "lessThan": "00c13b4ab481a09d915d099815cff1b10926ddd9", "status": "affected", "versionType": "git"}, {"version": "056f2821b631df2b94d3b017fd1e1eef918ed98d", "lessThan": "673611cc2ab9769929644ce879f7ea34932a3011", "status": "affected", "versionType": "git"}, {"version": "056f2821b631df2b94d3b017fd1e1eef918ed98d", "lessThan": "7ad2fec276946a0dedfa54eb26fc38c4fc6a6034", "status": "affected", "versionType": "git"}, {"version": "056f2821b631df2b94d3b017fd1e1eef918ed98d", "lessThan": "abac9820b26b5cfcb01eb79efe2abdd0ac7e07c3", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/media/cec/usb/extron-da-hd-4k-plus/extron-da-hd-4k-plus.c"], "versions": [{"version": "6.12", "status": "affected"}, {"version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.5", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18.51"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.2.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.3-rc1"}]}]}], "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"}}}}

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{"affected": [{"affectedData": [{"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-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"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-16T11:16:58.660", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/00c13b4ab481a09d915d099815cff1b10926ddd9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/673611cc2ab9769929644ce879f7ea34932a3011"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7ad2fec276946a0dedfa54eb26fc38c4fc6a6034"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/abac9820b26b5cfcb01eb79efe2abdd0ac7e07c3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

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