# CVE-2026-80914

## Summary

- **CVE ID:** CVE-2026-80914
- **Severity:** HIGH
- **CVSS Score:** 8.8 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Sep 9, 2026
- **Last Modified:** Sep 14, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready

iso_conn_ready() looks up the BIS listener socket with iso_get_sock(),
which takes a reference, and then, without re-checking its state,
creates a child socket from it:

    parent = iso_get_sock(hdev, ...);
    if (!parent)
        return;

    lock_sock(parent);
    sk = iso_sock_alloc(sock_net(parent), NULL, BTPROTO_ISO, ...);
    ...
    iso_chan_add(conn, sk, parent);
    ...
    release_sock(parent);
    sock_put(parent);

If the listener socket is closed concurrently, between iso_get_sock()
and lock_sock(), the reference taken by iso_get_sock() may be the last
one: the close path drops the link-list reference, and once
iso_conn_ready() drops its own reference at the end of the function the
socket is freed.  The child socket, however, is already linked to the
freed parent, and a later disconnect of the child runs iso_chan_del()
-> bt_accept_unlink(), which dereferences the dangling parent pointer
into the freed accept queue (a use-after-free).  The same dangling
pointer is also dereferenced through parent->***() in
iso_chan_del().

Fix it the same way the connected (non-BIS) path was fixed in commit
0d255e63fcf3 ("Bluetooth: ISO: hold sk properly in iso_conn_ready"):
after taking the socket lock, re-check that the parent is still a
listening, alive socket, and bail out otherwise.

## Affected Products

- Linux — Linux (ccf74f2390d60a2f9a75ef496d2564abb478f46a)
- Linux — Linux (6.0)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)
- Linux — Linux (6.1.188)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/2387cd06a2c0b416f05028b02bba1089f54c28d9)
- [CNA](https://git.kernel.org/stable/c/49fd7116f76b860b230843700fb7423ab5331e1f)
- [CNA](https://git.kernel.org/stable/c/03288b7447c9e572f8ab82fc29cfb4ca719ab210)
- [CNA](https://git.kernel.org/stable/c/560bef609fa5992745929e8d7d458b9d88dd2830)
- [CNA](https://git.kernel.org/stable/c/1702f12cf59a1c3b670eb6bb4a4d6fcccf07e3b8)
- [CNA](https://git.kernel.org/stable/c/d47b8f8c02a3d3f282693e5a4ff1f6b4b00518de)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.23%
- **EPSS Percentile:** 14.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._