What’s Vulnerable › Vulnerabilities

CVE-2026-53251: Bluetooth: ISO: Fix not releasing hdev reference on iso_conn_big_sync

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-25 · updated 2026-07-08
• Weakness: CWE-772

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: Fix not releasing hdev reference on iso_conn_big_sync hci_get_route() returns a reference-counted hci_dev pointer via hci_dev_hold(). The function exits normally or with an error without ever releasing it.

Affected products

• Linux kernel: from 6.11.11 before 6.12; from 6.12.2 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 7.1-rc1, 7.1-rc2, 7.1-rc3, 7.1-rc4, 7.1-rc5, 7.1-rc6 — fixed in 6.12, 6.12.94, 6.18.36, 7.0.13

How to fix

Upgrade to a fixed version: Linux kernel 6.12, 6.12.94, 6.18.36, 7.0.13. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/23e8eb16820b866528fb300dc67fe3f67f00ef62
• https://git.kernel.org/stable/c/33d677d2e3713d98012c3dbd4a9207f7d785b854
• https://git.kernel.org/stable/c/4bbec25f47b930101294fd310c627c3f53e9661f
• https://git.kernel.org/stable/c/5cbf290b79351971f20c7a533247e8d58a3f970c

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