CVE-2025-39889High· 8.1▾ TwilightIn 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…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 44.6 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 26.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.10%
0.10% → 0.10%
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
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:
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)
linux_kernel >= 5.11, < 5.15.181linux_kernel >= 5.16, < 6.1.135linux_kernel >= 6.2, < 6.6.88linux_kernel >= 6.7, < 6.12.25linux_kernel >= 6.13, < 6.14.4linux_kernel = 6.15Upgrade past the affected range:
linux_kernel 6.14.4Connected by shared product, vendor, weakness, or advisory.
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