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GHSA-5WC4-C9Q8-2Q27

Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32

Details

In the Linux kernel, the following vulnerability has been resolved:

tty: skip cdev_del() when no cdev is registered

TTY device registration can fail before a cdev is allocated. Serial core keeps the port so setserial can still use it, and later removal passes the NULL cdev slot to cdev_del(), causing a NULL-pointer dereference.

Only delete the cdev when the slot is not NULL.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-90335"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:17:32Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: skip cdev_del() when no cdev is registered\n\nTTY device registration can fail before a cdev is allocated.\nSerial core keeps the port so setserial can still use it, and later\nremoval passes the NULL cdev slot to cdev_del(), causing a NULL-pointer\ndereference.\n\nOnly delete the cdev when the slot is not NULL.",
  "id": "GHSA-5wc4-c9q8-2q27",
  "modified": "2026-09-17T18:32:01Z",
  "published": "2026-09-17T18:32:01Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90335"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3dbf85ef40b6366ba15e882f7536cdc98bea579a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c3b5623fd97648f2747444aa8932ae604662df93"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-90335 (GCVE-0-2026-90335)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:08 – Updated: 2026-09-17 16:08

Title

tty: skip cdev_del() when no cdev is registered

Summary

In the Linux kernel, the following vulnerability has been resolved: tty: skip cdev_del() when no cdev is registered TTY device registration can fail before a cdev is allocated. Serial core keeps the port so setserial can still use it, and later removal passes the NULL cdev slot to cdev_del(), causing a NULL-pointer dereference. Only delete the cdev when the slot is not NULL.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/3dbf85ef40b6366ba…
https://git.kernel.org/stable/c/c3b5623fd97648f27…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a3a10ce3429e5dee623ad5c8407ea58e204fcb0a , < 3dbf85ef40b6366ba15e882f7536cdc98bea579a (git) Affected: a3a10ce3429e5dee623ad5c8407ea58e204fcb0a , < c3b5623fd97648f2747444aa8932ae604662df93 (git)
Linux	Linux	Affected: 4.3 Unaffected: 0 , < 4.3 (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/tty_io.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3dbf85ef40b6366ba15e882f7536cdc98bea579a",
              "status": "affected",
              "version": "a3a10ce3429e5dee623ad5c8407ea58e204fcb0a",
              "versionType": "git"
            },
            {
              "lessThan": "c3b5623fd97648f2747444aa8932ae604662df93",
              "status": "affected",
              "version": "a3a10ce3429e5dee623ad5c8407ea58e204fcb0a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/tty_io.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.3"
            },
            {
              "lessThan": "4.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "4.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: skip cdev_del() when no cdev is registered\n\nTTY device registration can fail before a cdev is allocated.\nSerial core keeps the port so setserial can still use it, and later\nremoval passes the NULL cdev slot to cdev_del(), causing a NULL-pointer\ndereference.\n\nOnly delete the cdev when the slot is not NULL."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:08:48.127Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3dbf85ef40b6366ba15e882f7536cdc98bea579a"
        },
        {
          "url": "https://git.kernel.org/stable/c/c3b5623fd97648f2747444aa8932ae604662df93"
        }
      ],
      "title": "tty: skip cdev_del() when no cdev is registered",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90335",
    "datePublished": "2026-09-17T16:08:48.127Z",
    "dateReserved": "2026-09-11T19:38:34.803Z",
    "dateUpdated": "2026-09-17T16:08:48.127Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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.
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GHSA-5WC4-C9Q8-2Q27

CVE-2026-90335 (GCVE-0-2026-90335)

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