CVE-2026-98752

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: tty: port: fix tty_port_tty_vhangup() race Drivers rely on tty_port_tty_vhangup() to synchronously hang up their ports before tearing down resources as part of deregistration (e.g. on physical disconnect). If tty_port_tty_vhangup() races with another hangup it may however return before the port has been shut down. This is in turn can lead to use-after-free and NULL-pointer dereferences in racing ioctls (including a synchronous hangup) and in processing of racing asynchronous hangups (carrier loss). Add the missing serialisation to tty_port_tty_vhangup() and tty_port_hangup() so that the former does not return until the port has been shut down also when there is a racing hangup. Note that serial core does not use tty_port_hangup(), but it already holds the port mutex when clearing port->tty and shutting down the port in uart_hangup().

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-18 16:17:28.993000

Last modified

2026-10-30 13:21:24.107000

View original CVE JSON

{
  "id": "CVE-2026-98752",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-18T16:17:28.993",
  "lastModified": "2026-10-30T13:21:24.107",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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 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()."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/tty/tty_port.c",
            "include/linux/tty_port.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "7ca0ff9ab3218ec443a7a9ad247e4650373ed41e",
              "lessThan": "a78910f6d78cc1415cbc9b4fb621c3f4f6945be2",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "7ca0ff9ab3218ec443a7a9ad247e4650373ed41e",
              "lessThan": "2e16ae1464a4f435425c6f6ff1e293db850a624c",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "7ca0ff9ab3218ec443a7a9ad247e4650373ed41e",
              "lessThan": "a776d603d1e1bba2837295817b0a39394707b10d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "7ca0ff9ab3218ec443a7a9ad247e4650373ed41e",
              "lessThan": "ce220b4cdf62f73db0c1940f968eb33b9899fdd0",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "7ca0ff9ab3218ec443a7a9ad247e4650373ed41e",
              "lessThan": "6d1a984afc3ca477dab3e51ec806671d443ad524",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "7ca0ff9ab3218ec443a7a9ad247e4650373ed41e",
              "lessThan": "6b7be3b9b857947e9c1338d4919d4ebd3b75e907",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "7ca0ff9ab3218ec443a7a9ad247e4650373ed41e",
              "lessThan": "017b18addbe8dcace1a569a00d40ed1ba1e03f4c",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "7ca0ff9ab3218ec443a7a9ad247e4650373ed41e",
              "lessThan": "b48820de8c1a596c5b99775524dfce73c6576c5d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4260dc792fabfd20c8644fa9414b2ae48372365f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "2.6.31.2",
              "lessThan": "2.6.32",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/tty/tty_port.c",
            "include/linux/tty_port.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "2.6.32",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "2.6.32",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.273",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.224",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.160",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.113",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.56",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.10",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/017b18addbe8dcace1a569a00d40ed1ba1e03f4c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2e16ae1464a4f435425c6f6ff1e293db850a624c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6b7be3b9b857947e9c1338d4919d4ebd3b75e907",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6d1a984afc3ca477dab3e51ec806671d443ad524",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a776d603d1e1bba2837295817b0a39394707b10d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a78910f6d78cc1415cbc9b4fb621c3f4f6945be2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b48820de8c1a596c5b99775524dfce73c6576c5d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ce220b4cdf62f73db0c1940f968eb33b9899fdd0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
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}