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CVE-2020-28941 (GCVE-0-2020-28941)

Vulnerability from cvelistv5 – Published: 2020-11-19 15:23 – Updated: 2026-05-29 16:06
VLAI
Summary
An issue was discovered in drivers/accessibility/speakup/spk_ttyio.c in the Linux kernel through 5.9.9. Local attackers on systems with the speakup driver could cause a local denial of service attack, aka CID-d41227544427. This occurs because of an invalid free when the line discipline is used more than once.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-29 16:06 UTC
CWE
  • n/a
  • CWE-763 - Release of Invalid Pointer or Reference
Assigner
References
Show details on NVD website
To clipboard 

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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T07:37:47+00:00",
      "cve": "CVE-2020-28941",
      "id": "CVE-2020-28941",
      "initial_release_date": "2020-11-19T00:00:00+00:00",
      "product_status:known_not_affected": "104",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: NULL pointer dereference in spk_ttyio_ldisc_close function in drivers/accessibility/speakup/spk_ttyio.c",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-28941.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T02:14:53Z",
      "cve": "CVE-2020-28941",
      "id": "CVE-2020-28941",
      "initial_release_date": "2023-02-15T03:51:54Z",
      "product_status:known_affected": "300",
      "product_status:known_not_affected": "297",
      "product_status:recommended": "928",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2020-28941",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2020-28941.json",
      "version": "38"
    },
    "vulnrichment": {
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      "cveMetadata": "{\"cveId\": \"CVE-2020-28941\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-29T16:06:53.239Z\", \"dateReserved\": \"2020-11-19T00:00:00.000Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2020-11-19T15:23:28.000Z\", \"assignerShortName\": \"mitre\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Detection rules are retrieved from Rulezet.


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.