{"id":"CVE-2026-98753","state":"PUBLISHED","title":"tty: tty_port: restore TTY_IO_ERROR on activation failure","description":"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 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.","publishedAt":"2026-10-18T15:47:37.700Z","updatedAt":"2026-10-30T12:39:23.712Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4","status":"affected","lessThan":"761e8c5eb13d1b5e196b0b39bdfed6fc67af9dd2","versionType":"git"},{"version":"a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4","status":"affected","lessThan":"5469dc4153a60289c5bae00215947c6ce09fcc0e","versionType":"git"},{"version":"a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4","status":"affected","lessThan":"e24625bff786fa3f22cc38b5038362b910621e83","versionType":"git"},{"version":"a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4","status":"affected","lessThan":"16032c980d8f71642fcdc99309c571df3fcf3328","versionType":"git"},{"version":"a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4","status":"affected","lessThan":"34d4f67472ef7a744970b772a8565ddc727788e2","versionType":"git"},{"version":"a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4","status":"affected","lessThan":"7021acc84c2e0add77a1a33152e3a1e428fdbfdb","versionType":"git"},{"version":"a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4","status":"affected","lessThan":"6388409b711eb91b14fa075a4d861ccc4df1cfe7","versionType":"git"},{"version":"a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4","status":"affected","lessThan":"56964f6a31238fb41d5830bb42520c5b10ff7d8f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/tty_port.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.33","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.33","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/tty_port.c"]}],"references":["https://git.kernel.org/stable/c/761e8c5eb13d1b5e196b0b39bdfed6fc67af9dd2","https://git.kernel.org/stable/c/5469dc4153a60289c5bae00215947c6ce09fcc0e","https://git.kernel.org/stable/c/e24625bff786fa3f22cc38b5038362b910621e83","https://git.kernel.org/stable/c/16032c980d8f71642fcdc99309c571df3fcf3328","https://git.kernel.org/stable/c/34d4f67472ef7a744970b772a8565ddc727788e2","https://git.kernel.org/stable/c/7021acc84c2e0add77a1a33152e3a1e428fdbfdb","https://git.kernel.org/stable/c/6388409b711eb91b14fa075a4d861ccc4df1cfe7","https://git.kernel.org/stable/c/56964f6a31238fb41d5830bb42520c5b10ff7d8f"],"weaknesses":[],"ingestedAt":"2026-10-30T12:58:04.520Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98753.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98753","state":"PUBLISHED","datePublished":"2026-10-18T15:47:37.700Z","dateUpdated":"2026-10-30T12:39:23.712Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.368Z"},"containers":{"cna":{"title":"tty: tty_port: restore TTY_IO_ERROR on activation failure","descriptions":[{"lang":"en","value":"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 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4","status":"affected","lessThan":"761e8c5eb13d1b5e196b0b39bdfed6fc67af9dd2","versionType":"git"},{"version":"a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4","status":"affected","lessThan":"5469dc4153a60289c5bae00215947c6ce09fcc0e","versionType":"git"},{"version":"a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4","status":"affected","lessThan":"e24625bff786fa3f22cc38b5038362b910621e83","versionType":"git"},{"version":"a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4","status":"affected","lessThan":"16032c980d8f71642fcdc99309c571df3fcf3328","versionType":"git"},{"version":"a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4","status":"affected","lessThan":"34d4f67472ef7a744970b772a8565ddc727788e2","versionType":"git"},{"version":"a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4","status":"affected","lessThan":"7021acc84c2e0add77a1a33152e3a1e428fdbfdb","versionType":"git"},{"version":"a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4","status":"affected","lessThan":"6388409b711eb91b14fa075a4d861ccc4df1cfe7","versionType":"git"},{"version":"a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4","status":"affected","lessThan":"56964f6a31238fb41d5830bb42520c5b10ff7d8f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/tty_port.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.33","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.33","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/tty_port.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/761e8c5eb13d1b5e196b0b39bdfed6fc67af9dd2"},{"url":"https://git.kernel.org/stable/c/5469dc4153a60289c5bae00215947c6ce09fcc0e"},{"url":"https://git.kernel.org/stable/c/e24625bff786fa3f22cc38b5038362b910621e83"},{"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:39:23.712Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"6.18.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.33","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}