{"id":"CVE-2026-89598","title":"kernel: fbdev: ssd1307fb: defer I2C transfers from damage callbacks (CVE-2026-89598)","summary":"A flaw was found in the Linux kernel's fbdev (framebuffer device) subsystem, specifically within the ssd1307fb driver. This vulnerability occurs when display damage callbacks, which handle updates to the display, perform synchronous I2C (I…","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-821","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T17:01:56+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89598.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89598.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89598"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532043"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89598"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89598"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89598.mbox"},{"url":"https://git.kernel.org/stable/c/237924f5b9afc93b57c87bc8efc5ea2e687855e4"},{"url":"https://git.kernel.org/stable/c/b64f3497a0cd7bbd26d6c268eebd217d8062fcee"},{"url":"https://git.kernel.org/stable/c/3bcab9b21f71d52bd1b2e03b80f29516bb000593"},{"url":"https://git.kernel.org/stable/c/1981e54ac137f773fb25a7209a42b75213868306"},{"url":"https://git.kernel.org/stable/c/9ad709afdfa32509ed64938a6d9cd00db3cd54c2"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00168,"epssPercentile":0.06459,"ingestedAt":"2026-09-14T15:23:07.451Z","slug":"CVE-2026-89598","body":"## Overview\n\nA flaw was found in the Linux kernel's fbdev (framebuffer device) subsystem, specifically within the ssd1307fb driver. This vulnerability occurs when display damage callbacks, which handle updates to the display, perform synchronous I2C (Inter-Integrated Circuit) transfers from an atomic context. This can lead to a 'scheduling while atomic' bug, causing system instability or a denial of service (DoS) for a local user.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89598.json)\n\n**kernel: fbdev: ssd1307fb: defer I2C transfers from damage callbacks** — rated Low by Red Hat. Released 2026-09-11, updated 2026-09-14.\n\nAffected:\n\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":202718,"id":"CVE-2026-89598","ts":1789403715198,"field":"cvss","old":null,"new":"5.5"},{"seq":202717,"id":"CVE-2026-89598","ts":1789403715198,"field":"severity","old":"none","new":"medium"},{"seq":147792,"id":"CVE-2026-89598","ts":1789270212308,"field":"cvss","old":null,"new":"5.5"},{"seq":147791,"id":"CVE-2026-89598","ts":1789270212308,"field":"severity","old":"none","new":"medium"},{"seq":109548,"id":"CVE-2026-89598","ts":1789183732370,"field":"cvss","old":null,"new":"5.5"},{"seq":109547,"id":"CVE-2026-89598","ts":1789183732370,"field":"severity","old":"none","new":"medium"}]}