CVE-2026-31408
Description
A flaw was found in the Linux kernel's Bluetooth SCO (Synchronous Connection-Oriented) protocol implementation. The sco_recv_frame() function fails to properly hold a reference to a socket after releasing a lock. This oversight allows a concurrent operation to free the socket while it is still being accessed, leading to a use-after-free vulnerability. A local attacker could potentially exploit this to cause memory corruption or a denial of service.
Statement
Under sco_conn_lock, the code read conn->sk then dropped the lock without sco_sock_hold(), so close() could race and free the socket before sk->sk_state use. The fix mirrors other SCO helpers. Adjacent Bluetooth is involved; impact is UAF and likely crash.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7 | N/A | 8.8 |
| Attack Vector | Local | N/A | Adjacent Network |
| Attack Complexity | High | N/A | Low |
| Privileges Required | Low | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
