{ "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": "2026-10-19T08:54:31.163Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:54:31.163Z" }, "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", "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" } ] } ] } ], "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" } } } }