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CVE-2025-39889 (GCVE-0-2025-39889)

Vulnerability from cvelistv5 – Published: 2025-09-24 11:02 – Updated: 2026-08-05 12:05
VLAI
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)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
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 2026-01-14 17:37 UTC
CWE
  • CWE-326 - Inadequate Encryption Strength
Assigner
References
Impacted 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 Create a notification for this product.
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 Create a notification for this product.
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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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    "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": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-39889\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-14T17:37:06.505788Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-326\", \"description\": \"CWE-326 Inadequate Encryption Strength\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-14T17:37:00.445Z\"}}], \"cna\": {\"title\": \"Bluetooth: l2cap: Check encryption key size on incoming connection\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 8.1, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N\"}}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4f911a538e089cce808a15dc3277250f4f8daef9\", \"lessThan\": \"ed503d340a501e414114ddc614a3aae4f6e9eae2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"288c06973daae4637f25a0d1bdaf65fdbf8455f9\", \"lessThan\": \"24b2cdfc16e9bd6ab3d03b8e01c590755bd3141f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"288c06973daae4637f25a0d1bdaf65fdbf8455f9\", \"lessThan\": \"c6d527bbd3d3896375079f5dbc8b7f96734a3ba5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"288c06973daae4637f25a0d1bdaf65fdbf8455f9\", \"lessThan\": \"9e3114958d87ea88383cbbf38c89e04b8ea1bce5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"288c06973daae4637f25a0d1bdaf65fdbf8455f9\", \"lessThan\": \"d49798ecd26e0ee7995a7fc1e90ca5cd9b4402d6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"288c06973daae4637f25a0d1bdaf65fdbf8455f9\", \"lessThan\": \"d4ca2fd218caafbf50e3343ba1260c6a23b5676a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"288c06973daae4637f25a0d1bdaf65fdbf8455f9\", \"lessThan\": \"522e9ed157e3c21b4dd623c79967f72c21e45b78\", \"versionType\": \"git\"}], \"programFiles\": [\"net/bluetooth/l2cap_core.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.11\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.11\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.181\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.135\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.88\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.25\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.14.*\"}, {\"status\": \"unaffected\", \"version\": \"6.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/bluetooth/l2cap_core.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/ed503d340a501e414114ddc614a3aae4f6e9eae2\"}, {\"url\": \"https://git.kernel.org/stable/c/24b2cdfc16e9bd6ab3d03b8e01c590755bd3141f\"}, {\"url\": \"https://git.kernel.org/stable/c/c6d527bbd3d3896375079f5dbc8b7f96734a3ba5\"}, {\"url\": \"https://git.kernel.org/stable/c/9e3114958d87ea88383cbbf38c89e04b8ea1bce5\"}, {\"url\": \"https://git.kernel.org/stable/c/d49798ecd26e0ee7995a7fc1e90ca5cd9b4402d6\"}, {\"url\": \"https://git.kernel.org/stable/c/d4ca2fd218caafbf50e3343ba1260c6a23b5676a\"}, {\"url\": \"https://git.kernel.org/stable/c/522e9ed157e3c21b4dd623c79967f72c21e45b78\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: l2cap: Check encryption key size on incoming connection\\n\\nThis is required for passing GAP/SEC/SEM/BI-04-C PTS test case:\\n  Security Mode 4 Level 4, Responder - 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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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.