What is CVE-2026-63944?

CVE-2026-63944 is a high-severity vulnerability in Linux. CVSS score: 8.8/10. Published 2026-07-19.

How severe is CVE-2026-63944?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Linux

CVE-2026-63944

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: fix UAF in hci_le_create_cis_sync hci_le_create_cis_sync() dereferences conn->conn_timeout after releasing both rcu_read_lock() and hci_dev_lock(hde…

EPSS: 0.002 (10.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux — versions c09b80be6ffc338634b2f5f8cfa12b6843410834, 6.4, 0

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67

Frequently asked questions

What is CVE-2026-63944?: CVE-2026-63944 is a high-severity vulnerability in Linux. CVSS score: 8.8/10. Published 2026-07-19.
How severe is CVE-2026-63944?: High severity. CVSS v3 base score is 8.8 out of 10.