{"id":"CVE-2026-98753","title":"kernel: tty: tty_port: restore TTY_IO_ERROR on activation failure (CVE-2026-98753)","summary":"A flaw was found in the Linux kernel's TTY subsystem. A local user can cause a Denial of Service (DoS) by triggering a race condition during terminal device activation and hangup operations. When device activation fails, the kernel fails t…","severity":"medium","cvss":4.7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-366","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 7","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-10-18","updated":"2026-10-23","sourceUpdated":"2026-10-23T03:43:05+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98753.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98753.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98753"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555045"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98753"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98753"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98753.mbox"},{"url":"https://git.kernel.org/stable/c/16032c980d8f71642fcdc99309c571df3fcf3328"},{"url":"https://git.kernel.org/stable/c/34d4f67472ef7a744970b772a8565ddc727788e2"},{"url":"https://git.kernel.org/stable/c/7021acc84c2e0add77a1a33152e3a1e428fdbfdb"},{"url":"https://git.kernel.org/stable/c/6388409b711eb91b14fa075a4d861ccc4df1cfe7"},{"url":"https://git.kernel.org/stable/c/56964f6a31238fb41d5830bb42520c5b10ff7d8f"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00168,"epssPercentile":0.05987,"ingestedAt":"2026-10-18T16:47:32.499Z","slug":"CVE-2026-98753","body":"## Overview\n\nA flaw was found in the Linux kernel's TTY subsystem. A local user can cause a Denial of Service (DoS) by triggering a race condition during terminal device activation and hangup operations. When device activation fails, the kernel fails to restore an error flag, allowing subsequent input/output operations on powered-down or deregistered ports. This improper access can trigger a null-pointer dereference or unclocked hardware access, resulting in a kernel crash.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98753.json)\n\n**kernel: tty: tty_port: restore TTY_IO_ERROR on activation failure** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-23.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\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\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\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\nNot affected:\n\n- Red Hat Enterprise Linux 6\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":25.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228192,"id":"CVE-2026-98753","ts":1792758178816,"field":"cvss","old":null,"new":"4.7"},{"seq":228191,"id":"CVE-2026-98753","ts":1792758178816,"field":"severity","old":"none","new":"medium"}]}