Vulnerability-Lookup

GHSA-FXVH-5C26-7P3Q

Vulnerability from github – Published: 2026-10-18 18:32 – Updated: 2026-10-30 15:33

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98753"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:29Z",
    "severity": null
  },
  "details": "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": "GHSA-fxvh-5c26-7p3q",
  "modified": "2026-10-30T15:33:58Z",
  "published": "2026-10-18T18:32:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98753"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16032c980d8f71642fcdc99309c571df3fcf3328"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/34d4f67472ef7a744970b772a8565ddc727788e2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5469dc4153a60289c5bae00215947c6ce09fcc0e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/56964f6a31238fb41d5830bb42520c5b10ff7d8f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6388409b711eb91b14fa075a4d861ccc4df1cfe7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7021acc84c2e0add77a1a33152e3a1e428fdbfdb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/761e8c5eb13d1b5e196b0b39bdfed6fc67af9dd2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e24625bff786fa3f22cc38b5038362b910621e83"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98753 (GCVE-0-2026-98753)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:47 – Updated: 2026-10-30 12:39

Title

tty: tty_port: restore TTY_IO_ERROR on activation failure

Summary

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.

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

8 references

URL	Tags
https://git.kernel.org/stable/c/761e8c5eb13d1b5e1…
https://git.kernel.org/stable/c/5469dc4153a60289c…
https://git.kernel.org/stable/c/e24625bff786fa3f2…
https://git.kernel.org/stable/c/16032c980d8f71642…
https://git.kernel.org/stable/c/34d4f67472ef7a744…
https://git.kernel.org/stable/c/7021acc84c2e0add7…
https://git.kernel.org/stable/c/6388409b711eb91b1…
https://git.kernel.org/stable/c/56964f6a31238fb41…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 , < 761e8c5eb13d1b5e196b0b39bdfed6fc67af9dd2 (git) Affected: a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 , < 5469dc4153a60289c5bae00215947c6ce09fcc0e (git) Affected: a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 , < e24625bff786fa3f22cc38b5038362b910621e83 (git) Affected: a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 , < 16032c980d8f71642fcdc99309c571df3fcf3328 (git) Affected: a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 , < 34d4f67472ef7a744970b772a8565ddc727788e2 (git) Affected: a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 , < 7021acc84c2e0add77a1a33152e3a1e428fdbfdb (git) Affected: a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 , < 6388409b711eb91b14fa075a4d861ccc4df1cfe7 (git) Affected: a9a37ec33a1b3e66b260ac1c29bff0aec8b89ae4 , < 56964f6a31238fb41d5830bb42520c5b10ff7d8f (git)
Linux	Linux	Affected: 2.6.33 Unaffected: 0 , < 2.6.33 (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)

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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "5.15.224",
              "versionType": "semver"
            },
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              "status": "unaffected",
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            {
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              "status": "unaffected",
              "version": "6.6.160",
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              "lessThanOrEqual": "6.12.*",
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.56",
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            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
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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

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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