CVE-2026-98752 (GCVE-0-2026-98752)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:47 – Updated: 2026-10-30 12:39
VLAI
Title
tty: port: fix tty_port_tty_vhangup() race
Summary
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
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6820 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7ca0ff9ab3218ec443a7a9ad247e4650373ed41e , < a78910f6d78cc1415cbc9b4fb621c3f4f6945be2 (git)
Affected: 7ca0ff9ab3218ec443a7a9ad247e4650373ed41e , < 2e16ae1464a4f435425c6f6ff1e293db850a624c (git)
Affected: 7ca0ff9ab3218ec443a7a9ad247e4650373ed41e , < a776d603d1e1bba2837295817b0a39394707b10d (git)
Affected: 7ca0ff9ab3218ec443a7a9ad247e4650373ed41e , < ce220b4cdf62f73db0c1940f968eb33b9899fdd0 (git)
Affected: 7ca0ff9ab3218ec443a7a9ad247e4650373ed41e , < 6d1a984afc3ca477dab3e51ec806671d443ad524 (git)
Affected: 7ca0ff9ab3218ec443a7a9ad247e4650373ed41e , < 6b7be3b9b857947e9c1338d4919d4ebd3b75e907 (git)
Affected: 7ca0ff9ab3218ec443a7a9ad247e4650373ed41e , < 017b18addbe8dcace1a569a00d40ed1ba1e03f4c (git)
Affected: 7ca0ff9ab3218ec443a7a9ad247e4650373ed41e , < b48820de8c1a596c5b99775524dfce73c6576c5d (git)
Affected: 4260dc792fabfd20c8644fa9414b2ae48372365f (git)
Affected: 2.6.31.2 , < 2.6.32 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.32
Unaffected: 0 , < 2.6.32 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "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-\u003etty and shutting down the port\nin uart_hangup()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:39:22.635Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/a78910f6d78cc1415cbc9b4fb621c3f4f6945be2"
        },
        {
          "url": "https://git.kernel.org/stable/c/2e16ae1464a4f435425c6f6ff1e293db850a624c"
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        },
        {
          "url": "https://git.kernel.org/stable/c/b48820de8c1a596c5b99775524dfce73c6576c5d"
        }
      ],
      "title": "tty: port: fix tty_port_tty_vhangup() race",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98752",
    "datePublished": "2026-10-18T15:47:36.877Z",
    "dateReserved": "2026-09-25T10:25:14.368Z",
    "dateUpdated": "2026-10-30T12:39:22.635Z",
    "state": "PUBLISHED"
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      "product_status:known_affected": "2",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "tty: port: fix tty_port_tty_vhangup() race",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98752.json",
      "version": "4"
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        "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-\u003etty and shutting down the port\nin uart_hangup()."
          }
        ],
        "id": "CVE-2026-98752",
        "lastModified": "2026-10-30T13:21:24.107",
        "metrics": {},
        "published": "2026-10-18T16:17:28.993",
        "references": [
          {
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            "url": "https://git.kernel.org/stable/c/6d1a984afc3ca477dab3e51ec806671d443ad524"
          },
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          },
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            "url": "https://git.kernel.org/stable/c/a78910f6d78cc1415cbc9b4fb621c3f4f6945be2"
          },
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          },
          {
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            "url": "https://git.kernel.org/stable/c/ce220b4cdf62f73db0c1940f968eb33b9899fdd0"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-23T03:43:05+00:00",
      "cve": "CVE-2026-98752",
      "id": "CVE-2026-98752",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "264",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tty: port: fix tty_port_tty_vhangup() race",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98752.json",
      "version": "3"
    }
  }
}



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Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.