CVE-2025-39889 - Vulnerability Details

Link	Providers
https://git.kernel.org/stable/c/24b2cdfc16e9bd6ab3d03b8e01c590755bd3141f
https://git.kernel.org/stable/c/522e9ed157e3c21b4dd623c79967f72c21e45b78
https://git.kernel.org/stable/c/9e3114958d87ea88383cbbf38c89e04b8ea1bce5
https://git.kernel.org/stable/c/c6d527bbd3d3896375079f5dbc8b7f96734a3ba5
https://git.kernel.org/stable/c/d49798ecd26e0ee7995a7fc1e90ca5cd9b4402d6
https://git.kernel.org/stable/c/d4ca2fd218caafbf50e3343ba1260c6a23b5676a

Type	Values Removed	Values Added
Description		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)
Title		Bluetooth: l2cap: Check encryption key size on incoming connection
References		https://git.kernel.org/stable/c/24b2cdfc16e9bd6ab3d03b8e01c590755bd3141f https://git.kernel.org/stable/c/522e9ed157e3c21b4dd623c79967f72c21e45b78 https://git.kernel.org/stable/c/9e3114958d87ea88383cbbf38c89e04b8ea1bce5 https://git.kernel.org/stable/c/c6d527bbd3d3896375079f5dbc8b7f96734a3ba5 https://git.kernel.org/stable/c/d49798ecd26e0ee7995a7fc1e90ca5cd9b4402d6 https://git.kernel.org/stable/c/d4ca2fd218caafbf50e3343ba1260c6a23b5676a

{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2025-39889", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.145Z", "datePublished": "2025-09-24T11:02:51.036Z", "dateUpdated": "2025-09-24T11:02:51.036Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-09-24T11:02:51.036Z"}, "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< HCI Command: Read Encrypti.. (0x05|0x0008) plen 2\n Handle: 14 Address: 00:1B:DC:F2:24:10 (Vencer Co., Ltd.)\n> 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> 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< 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)"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/l2cap_core.c"], "versions": [{"version": "288c06973daae4637f25a0d1bdaf65fdbf8455f9", "lessThan": "24b2cdfc16e9bd6ab3d03b8e01c590755bd3141f", "status": "affected", "versionType": "git"}, {"version": "288c06973daae4637f25a0d1bdaf65fdbf8455f9", "lessThan": "c6d527bbd3d3896375079f5dbc8b7f96734a3ba5", "status": "affected", "versionType": "git"}, {"version": "288c06973daae4637f25a0d1bdaf65fdbf8455f9", "lessThan": "9e3114958d87ea88383cbbf38c89e04b8ea1bce5", "status": "affected", "versionType": "git"}, {"version": "288c06973daae4637f25a0d1bdaf65fdbf8455f9", "lessThan": "d49798ecd26e0ee7995a7fc1e90ca5cd9b4402d6", "status": "affected", "versionType": "git"}, {"version": "288c06973daae4637f25a0d1bdaf65fdbf8455f9", "lessThan": "d4ca2fd218caafbf50e3343ba1260c6a23b5676a", "status": "affected", "versionType": "git"}, {"version": "288c06973daae4637f25a0d1bdaf65fdbf8455f9", "lessThan": "522e9ed157e3c21b4dd623c79967f72c21e45b78", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/l2cap_core.c"], "versions": [{"version": "5.11", "status": "affected"}, {"version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.181", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.135", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.88", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.25", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.14.4", "lessThanOrEqual": "6.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.15.181"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.1.135"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.6.88"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.12.25"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.14.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.15"}]}]}], "references": [{"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"}], "title": "Bluetooth: l2cap: Check encryption key size on incoming connection", "x_generator": {"engine": "bippy-1.2.0"}}}}

{"cveTags": [], "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< HCI Command: Read Encrypti.. (0x05|0x0008) plen 2\n Handle: 14 Address: 00:1B:DC:F2:24:10 (Vencer Co., Ltd.)\n> 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> 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< 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)"}], "id": "CVE-2025-39889", "lastModified": "2025-09-24T11:15:32.780", "metrics": {}, "published": "2025-09-24T11:15:32.780", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/24b2cdfc16e9bd6ab3d03b8e01c590755bd3141f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/522e9ed157e3c21b4dd623c79967f72c21e45b78"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9e3114958d87ea88383cbbf38c89e04b8ea1bce5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c6d527bbd3d3896375079f5dbc8b7f96734a3ba5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d49798ecd26e0ee7995a7fc1e90ca5cd9b4402d6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d4ca2fd218caafbf50e3343ba1260c6a23b5676a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

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