# CVE-2026-98458: Bluetooth: ISO: release unused CIS holds after channel attach

CVE-2026-98458 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-98458, released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-98458
- Priority: Routine
- CVSS: 6.5 (Moderate)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 18, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98458

## Description

In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: ISO: release unused CIS holds after channel attach  hci_bind_cis() and hci_connect_cis() return one hci_conn hold for the ISO layer.  A new channel association consumes that hold, which is eventually released by iso_conn_free().  There are two cases where iso_chan_add() does not create an association: it returns success when the socket is already attached to the same iso_conn, and it returns -EBUSY when another socket is attached.  The hold returned for the current call is unused in both cases.  This occurs when deferred setup calls iso_connect_cis() again for its existing socket, or when another socket attempts to reuse the CIS.  Detect the idempotent case while the connection is locked and release the unused hold after iso_chan_add().  Also release it on -EBUSY.  Do not drop it for other errors: a newly allocated iso_conn releases the transferred hold when its last temporary reference is put.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.113-1 | [DEBIAN-CVE-2026-98458](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98458.md) | Oct 19, 2026 |
| Linux | linux Debian 14 | 7.2.9-1 | [DEBIAN-CVE-2026-98458](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98458.md) | Oct 19, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.113-1~deb12u1 | [DEBIAN-CVE-2026-98458](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98458.md) | Oct 19, 2026 |

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Data as of 2026-11-08T06:59:42Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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