CVE-2026-64557: Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_connection_cb()
CVE-2026-64557 is a vulnerability in Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_connection_cb(), rated Moderate by Microsoft, with a CVSS 3.1 base score of 7.1 (High). An attacker can exploit it by an attacker with local access, with low privileges and without user interaction. Microsoft has not reported exploitation in the wild. The EPSS model estimates a 0.29% probability of exploitation activity in the next 30 days, higher than 22% of all scored vulnerabilities. Microsoft released the fix on 6 August 2026, outside Patch Tuesday. It affects 1 product in 1 product family (Open Source Software).
Key facts
- CVE ID
- CVE-2026-64557
- Severity
- High CVSS 7.1
- Microsoft severity
- Moderate
- Exploited in the wild
- No
- Publicly disclosed
- No
- Weakness
- CWE-416
- EPSS
- 0.29% (percentile 22%)
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- July 2026 Patch Tuesday
- Product families
- Open Source Software
CVSS score and vector
Microsoft scores CVE-2026-64557 at 7.1 (temporal 6.5) using CVSS 3.1. Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H/E:U
| Metric | Value |
|---|---|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality impact | High |
| Integrity impact | None |
| Availability impact | High |
| Exploit code maturity | Unproven |
NVD scores it 8.8 (HIGH) with CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products (1)
Open Source Software
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 | CBL-Mariner Releases | Security Update | 6.6.145.2-1 | No |
NIST NVD data
- NVD status
- Analyzed
- NVD CVSS
- 8.8 (HIGH)
- NVD weakness
- CWE-416
- Published to NVD
- NVD last modified
Affected configurations (CPE)
| Product | Vulnerable versions |
|---|---|
| linux kernel | from 3.13, before 6.1.178 |
| linux kernel | from 6.2, before 6.6.145 |
| linux kernel | from 6.7, before 6.12.97 |
| linux kernel | from 6.13, before 6.18.40 |
| linux kernel | from 6.19, before 7.1.5 |
| linux kernel 7.2 | all listed versions |
| linux kernel 7.2 | all listed versions |
References
- https://git.kernel.org/stable/c/36da806f7fbaee56ad9e81859deec203f9728700 (Patch)
- https://git.kernel.org/stable/c/6fef032af0092ed5ccb767239a9ac1bc38c08a40 (Patch)
- https://git.kernel.org/stable/c/733e76e74e406c1d1ddc7369420dd8a47f48bb8a (Patch)
- https://git.kernel.org/stable/c/84e718b6a814edc84159361f9f454a4e92ae91ae (Patch)
- https://git.kernel.org/stable/c/8c37e4338c801ebb8cee52436c01c41e009f6e87 (Patch)
- https://git.kernel.org/stable/c/b39298044e5534612511a2ff5de03ba5f6e7a820 (Patch)
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. |