CVE-2025-39889 (GCVE-0-2025-39889)
Vulnerability from cvelistv5 – Published: 2025-09-24 11:02 – Updated: 2026-08-05 12:05
VLAI
EPSS
VEX
Title
Bluetooth: l2cap: Check encryption key size on incoming connection
Summary
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: l2cap: Check encryption key size on incoming connection
This is required for passing GAP/SEC/SEM/BI-04-C PTS test case:
Security Mode 4 Level 4, Responder - Invalid Encryption Key Size
- 128 bit
This tests the security key with size from 1 to 15 bytes while the
Security Mode 4 Level 4 requests 16 bytes key size.
Currently PTS fails with the following logs:
- expected:Connection Response:
Code: [3 (0x03)] Code
Identifier: (lt)WildCard: Exists(gt)
Length: [8 (0x0008)]
Destination CID: (lt)WildCard: Exists(gt)
Source CID: [64 (0x0040)]
Result: [3 (0x0003)] Connection refused - Security block
Status: (lt)WildCard: Exists(gt),
but received:Connection Response:
Code: [3 (0x03)] Code
Identifier: [1 (0x01)]
Length: [8 (0x0008)]
Destination CID: [64 (0x0040)]
Source CID: [64 (0x0040)]
Result: [0 (0x0000)] Connection Successful
Status: [0 (0x0000)] No further information available
And HCI logs:
< HCI Command: Read Encrypti.. (0x05|0x0008) plen 2
Handle: 14 Address: 00:1B:DC:F2:24:10 (Vencer Co., Ltd.)
> HCI Event: Command Complete (0x0e) plen 7
Read Encryption Key Size (0x05|0x0008) ncmd 1
Status: Success (0x00)
Handle: 14 Address: 00:1B:DC:F2:24:10 (Vencer Co., Ltd.)
Key size: 7
> ACL Data RX: Handle 14 flags 0x02 dlen 12
L2CAP: Connection Request (0x02) ident 1 len 4
PSM: 4097 (0x1001)
Source CID: 64
< ACL Data TX: Handle 14 flags 0x00 dlen 16
L2CAP: Connection Response (0x03) ident 1 len 8
Destination CID: 64
Source CID: 64
Result: Connection successful (0x0000)
Status: No further information available (0x0000)
Severity
8.1 (High)
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 17:37 UTC
CWE
- CWE-326 - Inadequate Encryption Strength
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
4f911a538e089cce808a15dc3277250f4f8daef9 , < ed503d340a501e414114ddc614a3aae4f6e9eae2
(git)
Affected: 288c06973daae4637f25a0d1bdaf65fdbf8455f9 , < 24b2cdfc16e9bd6ab3d03b8e01c590755bd3141f (git) Affected: 288c06973daae4637f25a0d1bdaf65fdbf8455f9 , < c6d527bbd3d3896375079f5dbc8b7f96734a3ba5 (git) Affected: 288c06973daae4637f25a0d1bdaf65fdbf8455f9 , < 9e3114958d87ea88383cbbf38c89e04b8ea1bce5 (git) Affected: 288c06973daae4637f25a0d1bdaf65fdbf8455f9 , < d49798ecd26e0ee7995a7fc1e90ca5cd9b4402d6 (git) Affected: 288c06973daae4637f25a0d1bdaf65fdbf8455f9 , < d4ca2fd218caafbf50e3343ba1260c6a23b5676a (git) Affected: 288c06973daae4637f25a0d1bdaf65fdbf8455f9 , < 522e9ed157e3c21b4dd623c79967f72c21e45b78 (git) |
guessed | |
| Linux | Linux |
Affected:
5.11
Unaffected: 0 , < 5.11 (semver) Unaffected: 5.15.181 , ≤ 5.15.* (semver) Unaffected: 6.1.135 , ≤ 6.1.* (semver) Unaffected: 6.6.88 , ≤ 6.6.* (semver) Unaffected: 6.12.25 , ≤ 6.12.* (semver) Unaffected: 6.14.4 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix) |
guessed |
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(0x05|0x0008) plen 2\\n Handle: 14 Address: 00:1B:DC:F2:24:10 (Vencer Co., Ltd.)\\n\u003e HCI Event: Command Complete (0x0e) plen 7\\n Read Encryption Key Size (0x05|0x0008) ncmd 1\\n Status: Success (0x00)\\n Handle: 14 Address: 00:1B:DC:F2:24:10 (Vencer Co., Ltd.)\\n Key size: 7\\n\u003e ACL Data RX: Handle 14 flags 0x02 dlen 12\\n L2CAP: Connection Request (0x02) ident 1 len 4\\n PSM: 4097 (0x1001)\\n Source CID: 64\\n\u003c ACL Data TX: Handle 14 flags 0x00 dlen 16\\n L2CAP: Connection Response (0x03) ident 1 len 8\\n Destination CID: 64\\n Source CID: 64\\n Result: Connection successful (0x0000)\\n Status: No further information available 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Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-326\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-326\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.181\",\"matchCriteriaId\":\"12331C9E-F601-4EFC-899E-369F98DCC70B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.135\",\"matchCriteriaId\":\"5B9ACE29-7445-4B6F-B761-6367C005E275\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.88\",\"matchCriteriaId\":\"6E5947E5-45E3-462A-829B-382B3B1C61BD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.25\",\"matchCriteriaId\":\"8E59EE65-FA6B-4AE4-8125-26135E28BF35\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.14.4\",\"matchCriteriaId\":\"29FA1A8E-1C2A-4B0B-B397-2C915ECDEDEE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"8D465631-2980-487A-8E65-40AE2B9F8ED1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4C9D071F-B28E-46EC-AC61-22B913390211\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/24b2cdfc16e9bd6ab3d03b8e01c590755bd3141f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/522e9ed157e3c21b4dd623c79967f72c21e45b78\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9e3114958d87ea88383cbbf38c89e04b8ea1bce5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c6d527bbd3d3896375079f5dbc8b7f96734a3ba5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d49798ecd26e0ee7995a7fc1e90ca5cd9b4402d6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d4ca2fd218caafbf50e3343ba1260c6a23b5676a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ed503d340a501e414114ddc614a3aae4f6e9eae2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-30T02:55:52+00:00",
"cve": "CVE-2025-39889",
"id": "CVE-2025-39889",
"initial_release_date": "2025-09-24T00:00:00+00:00",
"product_status:known_affected": "232",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Bluetooth: l2cap: Check encryption key size on incoming connection",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39889.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-11T01:57:49Z",
"cve": "CVE-2025-39889",
"id": "CVE-2025-39889",
"initial_release_date": "2025-09-24T23:22:36Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "778",
"product_status:known_not_affected": "40",
"product_status:recommended": "464",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-39889",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-39889.json",
"version": "58"
},
"vulnrichment": {
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Invalid Encryption Key Size\\n - 128 bit\\n\\nThis tests the security key with size from 1 to 15 bytes while the\\nSecurity Mode 4 Level 4 requests 16 bytes key size.\\n\\nCurrently PTS fails with the following logs:\\n- expected:Connection Response:\\n Code: [3 (0x03)] Code\\n Identifier: (lt)WildCard: Exists(gt)\\n Length: [8 (0x0008)]\\n Destination CID: (lt)WildCard: Exists(gt)\\n Source CID: [64 (0x0040)]\\n Result: [3 (0x0003)] Connection refused - Security block\\n Status: (lt)WildCard: Exists(gt),\\nbut received:Connection Response:\\n Code: [3 (0x03)] Code\\n Identifier: [1 (0x01)]\\n Length: [8 (0x0008)]\\n Destination CID: [64 (0x0040)]\\n Source CID: [64 (0x0040)]\\n Result: [0 (0x0000)] Connection Successful\\n Status: [0 (0x0000)] No further information available\\n\\nAnd HCI logs:\\n\u003c HCI Command: Read Encrypti.. (0x05|0x0008) plen 2\\n Handle: 14 Address: 00:1B:DC:F2:24:10 (Vencer Co., Ltd.)\\n\u003e HCI Event: Command Complete (0x0e) plen 7\\n Read Encryption Key Size (0x05|0x0008) ncmd 1\\n Status: Success (0x00)\\n Handle: 14 Address: 00:1B:DC:F2:24:10 (Vencer Co., Ltd.)\\n Key size: 7\\n\u003e ACL Data RX: Handle 14 flags 0x02 dlen 12\\n L2CAP: Connection Request (0x02) ident 1 len 4\\n PSM: 4097 (0x1001)\\n Source CID: 64\\n\u003c ACL Data TX: Handle 14 flags 0x00 dlen 16\\n L2CAP: Connection Response (0x03) ident 1 len 8\\n Destination CID: 64\\n Source CID: 64\\n Result: Connection successful (0x0000)\\n Status: No further information available (0x0000)\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.181\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.135\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.88\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.25\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14.4\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.15\", \"versionStartIncluding\": \"5.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-04-02T08:39:32.702Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2025-39889\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-02T08:39:32.702Z\", \"dateReserved\": \"2025-04-16T07:20:57.145Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-24T11:02:51.036Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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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.
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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