{"id":"CVE-2026-89725","title":"kernel: media: cec: stm32: prevent out-of-bounds write on RX overflow (CVE-2026-89725)","summary":"A flaw was found in the Linux kernel's `media: cec: stm32` driver. A remote attacker can exploit an out-of-bounds write vulnerability by sending an overlong Consumer Electronics Control (CEC) message without an end-of-message signal. This …","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-787","vendor":"Red Hat","product":"Linux","affected":["Linux >= d69ae57453c80a2193bcdb3fd762efbec447eecf < f2499b720ea9b874d58770885c6c2e8445a8c3ef","Linux >= d69ae57453c80a2193bcdb3fd762efbec447eecf < 3df1a4026662121011187247897fe95fd84e8a3a","Linux >= d69ae57453c80a2193bcdb3fd762efbec447eecf < 37ac45f7d6e3a6a5dcf6452a0b7bad9a543e8344","Linux >= d69ae57453c80a2193bcdb3fd762efbec447eecf < 1b4fdefd788db990d1805feb5c7b2388de791ecd","Linux >= d69ae57453c80a2193bcdb3fd762efbec447eecf < c3edd7fb8e3692423a702705509947fc9c30b3d1","Linux >= d69ae57453c80a2193bcdb3fd762efbec447eecf < 0c260d3f97e52978a8c769bb095ac0901333a3ac","Linux >= d69ae57453c80a2193bcdb3fd762efbec447eecf < a85ce3b175615c2e13bc01e8a1b6b6b6910fde57","Linux >= d69ae57453c80a2193bcdb3fd762efbec447eecf < fb9dda38d4b9e90db07ed9a0ee2d35bf85494035","Linux 4.13"],"published":"2026-09-11","updated":"2026-09-15","sourceUpdated":"2026-09-15T20:44:14+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89725.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89725.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89725"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532149"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89725"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89725"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89725.mbox"},{"url":"https://git.kernel.org/stable/c/f2499b720ea9b874d58770885c6c2e8445a8c3ef"},{"url":"https://git.kernel.org/stable/c/3df1a4026662121011187247897fe95fd84e8a3a"},{"url":"https://git.kernel.org/stable/c/37ac45f7d6e3a6a5dcf6452a0b7bad9a543e8344"},{"url":"https://git.kernel.org/stable/c/1b4fdefd788db990d1805feb5c7b2388de791ecd"},{"url":"https://git.kernel.org/stable/c/c3edd7fb8e3692423a702705509947fc9c30b3d1"},{"url":"https://git.kernel.org/stable/c/0c260d3f97e52978a8c769bb095ac0901333a3ac"},{"url":"https://git.kernel.org/stable/c/a85ce3b175615c2e13bc01e8a1b6b6b6910fde57"},{"url":"https://git.kernel.org/stable/c/fb9dda38d4b9e90db07ed9a0ee2d35bf85494035"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00266,"epssPercentile":0.18756,"scores":{"vendor":5.5,"cna":8.8},"ingestedAt":"2026-09-14T15:23:07.449Z","slug":"CVE-2026-89725","body":"## Overview\n\nA flaw was found in the Linux kernel's `media: cec: stm32` driver. A remote attacker can exploit an out-of-bounds write vulnerability by sending an overlong Consumer Electronics Control (CEC) message without an end-of-message signal. This causes the driver to write beyond an allocated buffer, potentially leading to arbitrary code execution or a denial of service. The vulnerability can be triggered without local privileges from the Interrupt Request (IRQ) thread.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89725.json)\n\n**kernel: media: cec: stm32: prevent out-of-bounds write on RX overflow** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nRefer to the advisory for fix availability.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":205518,"id":"CVE-2026-89725","ts":1789576723111,"field":"cvss","old":"8.8","new":"5.5"},{"seq":205517,"id":"CVE-2026-89725","ts":1789576723111,"field":"severity","old":"high","new":"medium"},{"seq":197694,"id":"CVE-2026-89725","ts":1789384318441,"field":"cvss","old":"7.5","new":"8.8"},{"seq":183851,"id":"CVE-2026-89725","ts":1789356677678,"field":"cvss","old":"8.8","new":"7.5"},{"seq":153612,"id":"CVE-2026-89725","ts":1789285351501,"field":"cvss","old":null,"new":"8.8"},{"seq":153611,"id":"CVE-2026-89725","ts":1789285351501,"field":"severity","old":"none","new":"high"},{"seq":147746,"id":"CVE-2026-89725","ts":1789270212130,"field":"cvss","old":null,"new":"7.5"},{"seq":147745,"id":"CVE-2026-89725","ts":1789270212130,"field":"severity","old":"none","new":"high"},{"seq":109502,"id":"CVE-2026-89725","ts":1789183732161,"field":"cvss","old":null,"new":"7.5"},{"seq":109501,"id":"CVE-2026-89725","ts":1789183732161,"field":"severity","old":"none","new":"high"}]}