CVE-2026-80914

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

Published Sep 9, 2026 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed

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

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`ccf74f2390d60a2f9a75ef496d2564abb478f46a`	affected	< 1702f12cf59a1c3b670eb6bb4a4d6fcccf07e3b8
`ccf74f2390d60a2f9a75ef496d2564abb478f46a`	affected	< d47b8f8c02a3d3f282693e5a4ff1f6b4b00518de
`ccf74f2390d60a2f9a75ef496d2564abb478f46a`	affected	< 2387cd06a2c0b416f05028b02bba1089f54c28d9
`ccf74f2390d60a2f9a75ef496d2564abb478f46a`	affected	< 49fd7116f76b860b230843700fb7423ab5331e1f
`ccf74f2390d60a2f9a75ef496d2564abb478f46a`	affected	< 03288b7447c9e572f8ab82fc29cfb4ca719ab210
`ccf74f2390d60a2f9a75ef496d2564abb478f46a`	affected	< 560bef609fa5992745929e8d7d458b9d88dd2830

Linux

affected

Version	Status	Constraints
`6.0`	affected	—
`0`	unaffected	< 6.0
`6.1.188`	unaffected	≤ 6.1.*
`6.6.157`	unaffected	≤ 6.6.*
`6.12.109`	unaffected	≤ 6.12.*
`6.18.50`	unaffected	≤ 6.18.*
`7.2.4`	unaffected	≤ 7.2.*
`7.3`	unaffected	≤ *

No data.

Vendor Product Versions

Linux

Linux Kernel

Version	Status	Scheme	Platform
`[ccf74f2390d60a2f9a75ef496d2564abb478f46a,2387cd06a2c0b416f05028b02bba1089f54c28d9)`	affected	code_commit	—
`[ccf74f2390d60a2f9a75ef496d2564abb478f46a,49fd7116f76b860b230843700fb7423ab5331e1f)`	affected	code_commit	—
`[ccf74f2390d60a2f9a75ef496d2564abb478f46a,03288b7447c9e572f8ab82fc29cfb4ca719ab210)`	affected	code_commit	—
`[ccf74f2390d60a2f9a75ef496d2564abb478f46a,560bef609fa5992745929e8d7d458b9d88dd2830)`	affected	code_commit	—

Linux

Linux Kernel

Version	Status	Scheme	Platform
`6.0`	affected	generic	—
`[0,6.0)`	unaffected	generic	—
`[6.12.109,6.13.0)`	unaffected	semver	—
`[6.18.50,6.19.0)`	unaffected	semver	—
`[7.2.4,7.3.0)`	unaffected	semver	—
`[7.3-rc1,*]`	unaffected	generic	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Debian DLA	DLA-4817-1	linux-6.12 security update
Debian DLA	DLA-4841-1	linux security update
Debian DSA	DSA-6528-1	linux security update
Ubuntu USN	USN-9019-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9020-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9022-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9023-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9024-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9025-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9026-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9039-1	Linux kernel (Azure CVM) vulnerabilities
Ubuntu USN	USN-9040-1	Linux kernel (Low Latency NVIDIA) vulnerabilities
Ubuntu USN	USN-9066-1	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-9091-1	Linux kernel (NVIDIA Tegra) vulnerabilities

Metrics

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.367% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/03288b7447c9e572f8ab82fc29cfb4ca719ab210
https://git.kernel.org/stable/c/1702f12cf59a1c3b670eb6bb4a4d6fcccf07e3b8
https://git.kernel.org/stable/c/2387cd06a2c0b416f05028b02bba1089f54c28d9
https://git.kernel.org/stable/c/49fd7116f76b860b230843700fb7423ab5331e1f
https://git.kernel.org/stable/c/560bef609fa5992745929e8d7d458b9d88dd2830
https://git.kernel.org/stable/c/d47b8f8c02a3d3f282693e5a4ff1f6b4b00518de

History

Sep 14, 2026 12:30 PM Added references View changes

Type	Values Removed	Values Added
References		https://git.kernel.org/stable/c/1702f12cf59a1c3b670eb6bb4a4d6fcccf07e3b8 https://git.kernel.org/stable/c/d47b8f8c02a3d3f282693e5a4ff1f6b4b00518de

Sep 10, 2026 10:45 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-362 CWE-416

Sep 10, 2026 8:30 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses	CWE-416

Sep 10, 2026 6:00 AM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 8.8, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}`

Sep 9, 2026 7:15 PM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-416

Sep 9, 2026 4:30 PM Description updated. Title updated. First appearance in the feed. Affected versions updated. Affected vendors updated. Added references View changes

Type	Values Removed	Values Added
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.
Title		Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/03288b7447c9e572f8ab82fc29cfb4ca719ab210 https://git.kernel.org/stable/c/2387cd06a2c0b416f05028b02bba1089f54c28d9 https://git.kernel.org/stable/c/49fd7116f76b860b230843700fb7423ab5331e1f https://git.kernel.org/stable/c/560bef609fa5992745929e8d7d458b9d88dd2830