What’s Vulnerable › Vulnerabilities

CVE-2026-74530: Bluetooth: hci_sync: hold conn in hci_connect_big_sync() callback

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-21

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: hold conn in hci_connect_big_sync() callback There is theoretical UAF if the conn is freed while the hci_sync task is running. Hold refcount to avoid that. Handle NULL hcon, return 0 + do nothing to match the previous behavior.

Affected products

• Linux kernel: from 6.12.28 before 6.12.114; from 6.14.6 before 6.15; 6.15 — fixed in 6.12.114, 6.15, 7.2

How to fix

Upgrade to a fixed version: Linux kernel 6.12.114, 6.15, 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/117d8bcaf1abc348185e8ab6a4ba9f8f516849a0
• https://git.kernel.org/stable/c/2d91e6244b69d752503b2d44020d8b0e323dbd38
• https://git.kernel.org/stable/c/56e78b670356caab0b607e8aad4cf819a1909d07
• https://git.kernel.org/stable/c/ff5625d27415ace5667bf87ebc16c3a0a98db22f

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