{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98753", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.368Z", "datePublished": "2026-10-18T15:47:37.700Z", "dateUpdated": "2026-10-30T12:39:23.712Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:39:23.712Z"}, "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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/tty/tty_port.c"], "versions": [{"version": "a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4", "lessThan": "761e8c5eb13d1b5e196b0b39bdfed6fc67af9dd2", "status": "affected", "versionType": "git"}, {"version": "a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4", "lessThan": "5469dc4153a60289c5bae00215947c6ce09fcc0e", "status": "affected", "versionType": "git"}, {"version": "a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4", "lessThan": "e24625bff786fa3f22cc38b5038362b910621e83", "status": "affected", "versionType": "git"}, {"version": "a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4", "lessThan": "16032c980d8f71642fcdc99309c571df3fcf3328", "status": "affected", 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/tty/tty_port.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "761e8c5eb13d1b5e196b0b39bdfed6fc67af9dd2", "status": "affected", "version": "a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4", "versionType": "git"}, {"lessThan": "5469dc4153a60289c5bae00215947c6ce09fcc0e", "status": "affected", "version": "a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4", "versionType": "git"}, {"lessThan": "e24625bff786fa3f22cc38b5038362b910621e83", "status": "affected", "version": "a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4", "versionType": "git"}, {"lessThan": "16032c980d8f71642fcdc99309c571df3fcf3328", "status": "affected", "version": "a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4", "versionType": "git"}, {"lessThan": "34d4f67472ef7a744970b772a8565ddc727788e2", "status": "affected", "version": "a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4", "versionType": "git"}, {"lessThan": "7021acc84c2e0add77a1a33152e3a1e428fdbfdb", "status": "affected", "version": "a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4", "versionType": "git"}, {"lessThan": "6388409b711eb91b14fa075a4d861ccc4df1cfe7", "status": "affected", "version": "a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4", "versionType": "git"}, {"lessThan": "56964f6a31238fb41d5830bb42520c5b10ff7d8f", "status": "affected", "version": "a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/tty/tty_port.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.33"}, {"lessThan": "2.6.33", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.273", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.113", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.56", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-98753", "lastModified": "2026-10-30T13:21:24.277", "metrics": {}, "published": "2026-10-18T16:17:29.103", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/16032c980d8f71642fcdc99309c571df3fcf3328"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/34d4f67472ef7a744970b772a8565ddc727788e2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5469dc4153a60289c5bae00215947c6ce09fcc0e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/56964f6a31238fb41d5830bb42520c5b10ff7d8f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6388409b711eb91b14fa075a4d861ccc4df1cfe7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7021acc84c2e0add77a1a33152e3a1e428fdbfdb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/761e8c5eb13d1b5e196b0b39bdfed6fc67af9dd2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e24625bff786fa3f22cc38b5038362b910621e83"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: tty: tty_port: restore TTY_IO_ERROR on activation failure", "id": "2555045", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2555045"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-366", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntty: tty_port: restore TTY_IO_ERROR on activation failure\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.\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.\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.", "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 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."], "name": "CVE-2026-98753", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98753\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98753\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98753.mbox"], "threat_severity": "Moderate"}