{"id":"CVE-2026-98752","title":"tty: port: fix tty_port_tty_vhangup() race","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ntty: port: fix tty_port_tty_vhangup() race\n\nDrivers rely on tty_port_tty_vhangup() to synchronously hang up their\nports before tearing down resources as part of deregis…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 7ca0ff9ab3218ec443a7a9ad247e4650373ed41e < 6d1a984afc3ca477dab3e51ec806671d443ad524","Linux >= 7ca0ff9ab3218ec443a7a9ad247e4650373ed41e < 6b7be3b9b857947e9c1338d4919d4ebd3b75e907","Linux >= 7ca0ff9ab3218ec443a7a9ad247e4650373ed41e < 017b18addbe8dcace1a569a00d40ed1ba1e03f4c","Linux >= 7ca0ff9ab3218ec443a7a9ad247e4650373ed41e < b48820de8c1a596c5b99775524dfce73c6576c5d","Linux 4260dc792fabfd20c8644fa9414b2ae48372365f","Linux >= 2.6.31.2 < 2.6.32","Linux 2.6.32"],"published":"2026-10-18","updated":"2026-10-18","sourceUpdated":"2026-10-18T15:47:36.877Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98752","references":[{"url":"https://git.kernel.org/stable/c/6d1a984afc3ca477dab3e51ec806671d443ad524"},{"url":"https://git.kernel.org/stable/c/6b7be3b9b857947e9c1338d4919d4ebd3b75e907"},{"url":"https://git.kernel.org/stable/c/017b18addbe8dcace1a569a00d40ed1ba1e03f4c"},{"url":"https://git.kernel.org/stable/c/b48820de8c1a596c5b99775524dfce73c6576c5d"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T16:47:32.498Z","slug":"CVE-2026-98752","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ntty: port: fix tty_port_tty_vhangup() race\n\nDrivers rely on tty_port_tty_vhangup() to synchronously hang up their\nports before tearing down resources as part of deregistration (e.g. on\nphysical disconnect).\n\nIf tty_port_tty_vhangup() races with another hangup it may however\nreturn before the port has been shut down. This is in turn can lead to\nuse-after-free and NULL-pointer dereferences in racing ioctls (including\na synchronous hangup) and in processing of racing asynchronous hangups\n(carrier loss).\n\nAdd the missing serialisation to tty_port_tty_vhangup() and\ntty_port_hangup() so that the former does not return until the port has\nbeen shut down also when there is a racing hangup.\n\nNote that serial core does not use tty_port_hangup(), but it already\nholds the port mutex when clearing port->tty and shutting down the port\nin uart_hangup().\n\n## Affected\n\n- `Linux >= 7ca0ff9ab3218ec443a7a9ad247e4650373ed41e < 6d1a984afc3ca477dab3e51ec806671d443ad524`\n- `Linux >= 7ca0ff9ab3218ec443a7a9ad247e4650373ed41e < 6b7be3b9b857947e9c1338d4919d4ebd3b75e907`\n- `Linux >= 7ca0ff9ab3218ec443a7a9ad247e4650373ed41e < 017b18addbe8dcace1a569a00d40ed1ba1e03f4c`\n- `Linux >= 7ca0ff9ab3218ec443a7a9ad247e4650373ed41e < b48820de8c1a596c5b99775524dfce73c6576c5d`\n- `Linux 4260dc792fabfd20c8644fa9414b2ae48372365f`\n- `Linux >= 2.6.31.2 < 2.6.32`\n- `Linux 2.6.32`\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":[]}