Vulnerability-Lookup

UBUNTU-CVE-2026-101887 (CVE-2026-101887)

Vulnerability from osv_ubuntu – Published: 2026-10-02 00:00 – Updated: 2026-10-02 00:00 – Source website

Details

BlueALSA (bluez-alsa/bluealsad) contains a division-by-zero vulnerability in the LC3plus sink decoder (a2dp-lc3plus.c, a2dp_lc3plus_dec_thread) that allows a Bluetooth-adjacent attacker to crash the daemon by sending a crafted RTP media header with an attacker-controlled frame count field set to zero. Attackers can establish an A2DP source connection with an LC3plus session negotiated against a victim running bluealsad as an A2DP sink and transmit a non-fragmented LC3plus media header with a zero frame count to trigger a SIGFPE in the decoding thread, causing a denial of service on builds compiled with LC3plus support enabled.

Severity

3.5 (Low)


                    
                      CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

2.1 (Low)


                    
                      CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-101887	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-101887	REPORT
	https://github.com/arkq/bluez-alsa/commit/1a84465…	REPORT
	https://www.vulncheck.com/advisories/bluealsa-blu…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "bluez-alsa-utils",
            "binary_version": "3.0.0-2"
          },
          {
            "binary_name": "libasound2-plugin-bluez",
            "binary_version": "3.0.0-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "bluez-alsa",
        "purl": "pkg:deb/ubuntu/bluez-alsa@3.0.0-2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0.0-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "bluez-alsa-utils",
            "binary_version": "4.1.1-1build3"
          },
          {
            "binary_name": "libasound2-plugin-bluez",
            "binary_version": "4.1.1-1build3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "bluez-alsa",
        "purl": "pkg:deb/ubuntu/bluez-alsa@4.1.1-1build3?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.0.0-2",
        "4.1.1-1",
        "4.1.1-1build1",
        "4.1.1-1build2",
        "4.1.1-1build3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "bluez-alsa-utils",
            "binary_version": "4.3.1-3.1"
          },
          {
            "binary_name": "libasound2-plugin-bluez",
            "binary_version": "4.3.1-3.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "bluez-alsa",
        "purl": "pkg:deb/ubuntu/bluez-alsa@4.3.1-3.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.3.1-3",
        "4.3.1-3.1"
      ]
    }
  ],
  "aliases": [],
  "details": "BlueALSA (bluez-alsa/bluealsad) contains a division-by-zero vulnerability in the LC3plus sink decoder (a2dp-lc3plus.c, a2dp_lc3plus_dec_thread) that allows a Bluetooth-adjacent attacker to crash the daemon by sending a crafted RTP media header with an attacker-controlled frame count field set to zero. Attackers can establish an A2DP source connection with an LC3plus session negotiated against a victim running bluealsad as an A2DP sink and transmit a non-fragmented LC3plus media header with a zero frame count to trigger a SIGFPE in the decoding thread, causing a denial of service on builds compiled with LC3plus support enabled.",
  "id": "UBUNTU-CVE-2026-101887",
  "modified": "2026-10-02T00:00:00Z",
  "published": "2026-10-02T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-101887"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-101887"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/arkq/bluez-alsa/commit/1a84465dd860d1be9dcf62339c6273e9e0632dd2"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/bluealsa-bluealsad-lc3plus-decoder-division-by-zero-dos"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-101887"
  ]
}

CVE-2026-101887 (GCVE-0-2026-101887)

Vulnerability from cvelistv5 – Published: 2026-10-01 02:28 – Updated: 2026-10-01 19:04 X_Open Source

Title

BlueALSA bluealsad LC3plus Decoder Division-by-Zero DoS

Summary

Severity

2.1 (Low)


                        
                          CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

3.5 (Low)


                        
                          CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-01 19:01 UTC

CWE

CWE-369 - Divide By Zero

Assigner

VulnCheck mitre root Scorecard

References

2 references

URL	Tags
https://github.com/arkq/bluez-alsa/commit/1a84465…	patch
https://www.vulncheck.com/advisories/bluealsa-blu…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
arkq	bluez-alsa	Affected: 0 , < 1a84465dd860d1be9dcf62339c6273e9e0632dd2 (git)

Date Public

2026-09-26 00:00

Credits

Harsh Raj Singhania VulnCheck

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-101887",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-01T19:01:40.747925Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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        "providerMetadata": {
          "dateUpdated": "2026-10-01T19:04:17.577Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/arkq/bluez-alsa",
          "product": "bluez-alsa",
          "repo": "https://github.com/arkq/bluez-alsa",
          "vendor": "arkq",
          "versions": [
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              "lessThan": "1a84465dd860d1be9dcf62339c6273e9e0632dd2",
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        }
      ],
      "metrics": [
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          "cvssV4_0": {
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "ADJACENT",
            "baseScore": 2.1,
            "baseSeverity": "LOW",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
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            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
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            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
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          "tags": [
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    "dateReserved": "2026-09-28T15:44:45.390Z",
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    "state": "PUBLISHED"
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  "dataVersion": "5.2"
}

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.

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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UBUNTU-CVE-2026-101887 (CVE-2026-101887)

CVE-2026-101887 (GCVE-0-2026-101887)

Tags

Sightings

Nomenclature

Related by attack behaviour