{"id":"CVE-2026-98753","title":"tty: tty_port: restore TTY_IO_ERROR on activation failure","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ntty: tty_port: restore TTY_IO_ERROR on activation failure\n\nMake sure to restore the TTY_IO_ERROR flag if activation fails to\nprevent I/O attempts on a port that is gone…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 < 34d4f67472ef7a744970b772a8565ddc727788e2","Linux >= a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 < 7021acc84c2e0add77a1a33152e3a1e428fdbfdb","Linux >= a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 < 6388409b711eb91b14fa075a4d861ccc4df1cfe7","Linux >= a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 < 56964f6a31238fb41d5830bb42520c5b10ff7d8f","Linux 2.6.33"],"published":"2026-10-18","updated":"2026-10-18","sourceUpdated":"2026-10-18T15:47:37.700Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98753","references":[{"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":["cve.org"],"ingestedAt":"2026-10-18T16:47:32.499Z","slug":"CVE-2026-98753","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ntty: tty_port: restore TTY_IO_ERROR on activation failure\n\nMake sure to restore the TTY_IO_ERROR flag if activation fails to\nprevent I/O attempts on a port that is gone or powered down.\n\nThis specifically avoids issues like kernel panic due to unclocked\naccesses or NULL-pointer dereferences when accessing powered down or\nderegistered ports when a TTY ioctl races with hangup and open.\n\nNote that the flag is set again in tty_port_close() but not restoring it\non activation failure leaves a window where drivers fail to handle the\nioctl-hangup race.\n\n## Affected\n\n- `Linux >= a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 < 34d4f67472ef7a744970b772a8565ddc727788e2`\n- `Linux >= a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 < 7021acc84c2e0add77a1a33152e3a1e428fdbfdb`\n- `Linux >= a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 < 6388409b711eb91b14fa075a4d861ccc4df1cfe7`\n- `Linux >= a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 < 56964f6a31238fb41d5830bb42520c5b10ff7d8f`\n- `Linux 2.6.33`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}