# CVE-2026-53276: linux: In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: ISO: Fix a use-after-free of the hci_...

CVE-2026-53276 is fixed in linux on 1 platform by DEBIAN-CVE-2026-53276 (version 7.0.13-1), released June 28, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-53276
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 25, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: ISO: Fix a use-after-free of the hci_conn pointer  In iso_sock_rebind_bc(), the bis pointer is cached, then the socket lock is dropped: 	bis = iso_pi(sk)->conn->hcon; 	/* Release the socket before lookups since that requires hci_dev_lock 	 * which shall not be acquired while holding sock_lock for proper 	 * ordering. 	 */ 	release_sock(sk); 	hci_dev_lock(bis->hdev);  During the unlocked window, could a concurrent close() destroy the connection and free the bis structure, causing hci_dev_lock(bis->hdev) to access memory after it is freed, fix this by using the hdev reference which was safely acquired via iso_conn_get_hdev().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.0.13-1 | [DEBIAN-CVE-2026-53276](https://patchblox.com/security/data/fix/linux/debian-cve-2026-53276.md) | Jun 28, 2026 |

---

Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.