Riskcovery

CVE-2023-54038

Bluetooth: hci_conn: return ERR_PTR instead of NULL when there is no link

State
Published
Severity
Not scored
Published
Dec 24, 2025
Updated
May 23, 2026
Reserved
Dec 24, 2025

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_conn: return ERR_PTR instead of NULL when there is no link

hci_connect_sco currently returns NULL when there is no link (i.e. when hci_conn_link() returns NULL).

sco_connect() expects an ERR_PTR in case of any error (see line 266 in sco.c). Thus, hcon set as NULL passes through to sco_conn_add(), which tries to get hcon->hdev, resulting in dereferencing a NULL pointer as reported by syzkaller.

The same issue exists for iso_connect_cis() calling hci_connect_cis().

Thus, make hci_connect_sco() and hci_connect_cis() return ERR_PTR instead of NULL.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 06149746e7203d5ffe2d6faf9799ee36203aa8b8 to before 357ab53c83a5322437fa434e9a9e3e0bafe6b383Affected
  • 06149746e7203d5ffe2d6faf9799ee36203aa8b8 to before b4066eb04bb67e7ff66e5aaab0db4a753f37eaadAffected
  • f72fc94a17d45be98aecfd59c39b5b24a6a342e2Affected
  • 6.3.8 to before 6.4Affected
LinuxLinux
  • 6.4Affected
  • before 6.4Not affected
  • 6.4.7 through 6.4.*Not affected
  • 6.5 and laterNot affected

References

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