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Vulnerability · Published Oct 18, 2026 · Assigned by Linux

CVE-2026-98753tty: tty_port: restore TTY_IO_ERROR on activation failure

Unrated

In plain English

A security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS )–Not rated
Exploit odds (30 days)0.2%top 92.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: tty: tty_port: restore TTY_IO_ERROR on activation failure Make sure to restore the TTY_IO_ERROR flag if activation fails to prevent I/O attempts on a port that is gone or powered down. This specifically avoids issues like kernel panic due to unclocked accesses or NULL-pointer dereferences when accessing powered down or deregistered ports when a TTY ioctl races with hangup and open. Note that the flag is set again in tty_port_close() but not restoring it on activation failure leaves a window where drivers fail to handle the ioctl-hangup race.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2026-98753
Debian:13linux6.12.113-1DEBIAN-CVE-2026-98753
Debian:14linux7.2.10-1DEBIAN-CVE-2026-98753
Debian:12linux-6.126.12.113-1~deb12u1DEBIAN-CVE-2026-98753
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98753
Ubuntu:26.04:LTSlinuxno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98753
Ubuntu:26.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-aws-7.0no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98753
Ubuntu:26.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-azure-7.0no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98753
Ubuntu:26.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-azure-fde-7.0no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98753
Ubuntu:26.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-gcp-7.0no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98753
Ubuntu:26.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-hwe-7.0no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98753
Ubuntu:26.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98753
Ubuntu:26.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-nvidia-7.0no fix listedUBUNTU-CVE-2026-98753
Ubuntu:26.04:LTSlinux-nvidia-bosno fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-98753
Ubuntu:26.04:LTSlinux-oem-7.0no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98753
Ubuntu:26.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-oracle-7.0no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98753
Ubuntu:26.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98753
Ubuntu:26.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98753
Ubuntu:26.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-riscv-7.0no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-vmwareno fix listedUBUNTU-CVE-2026-98753
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-98753
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-98753

Affected products (as reported)

VendorProductVersions
Linux Linux a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 – before 761e8c5eb13d1b5e196b0b39bdfed6fc67af9dd2a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 – before 5469dc4153a60289c5bae00215947c6ce09fcc0ea9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 – before e24625bff786fa3f22cc38b5038362b910621e83a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 – before 16032c980d8f71642fcdc99309c571df3fcf3328a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 – before 34d4f67472ef7a744970b772a8565ddc727788e2a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 – before 7021acc84c2e0add77a1a33152e3a1e428fdbfdba9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 – before 6388409b711eb91b14fa075a4d861ccc4df1cfe7a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 – before 56964f6a31238fb41d5830bb42520c5b10ff7d8f
Linux Linux 2.6.33

References