CVE-2026-80763: Bluetooth: hci_event: validate LE Set CIG Parameters response

CVE-2026-80763: Bluetooth: hci_event: validate LE Set CIG Parameters response

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

Description
===========

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

Bluetooth: hci_event: validate LE Set CIG Parameters response

The Command Complete dispatch validates only the fixed part of the LE Set
CIG Parameters response. After that part is pulled from the skb,
hci_cc_le_set_cig_params() trusts num_handles and reads each entry in the
trailing handle array.

Matching num_handles against the command's num_cis does not guarantee
that the response contains the advertised handles. A truncated response
from a malfunctioning controller can therefore make the handler read
beyond the skb data.

Validate that the remaining skb data contains all advertised handles.
Include this in the existing response validation so malformed responses
also follow the established CIG failure handling.

The Linux kernel CVE team has assigned CVE-2026-80763 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.0 with commit 26afbd826ee326e63a334c37fd45e82e50a615ec and fixed in 6.1.187 with commit 9e05783d0bb96a7b853cc058a7c7de2dc4a62154
	Issue introduced in 6.0 with commit 26afbd826ee326e63a334c37fd45e82e50a615ec and fixed in 6.6.154 with commit 26741d178f31932c9018b36b7953e6dc391436a4
	Issue introduced in 6.0 with commit 26afbd826ee326e63a334c37fd45e82e50a615ec and fixed in 6.12.106 with commit a34df5c4a439cfc04565fa5be608ed1e53134f1f
	Issue introduced in 6.0 with commit 26afbd826ee326e63a334c37fd45e82e50a615ec and fixed in 6.18.47 with commit e3f82e8f2a5915f533b57a065e9a045aa2ee03bc
	Issue introduced in 6.0 with commit 26afbd826ee326e63a334c37fd45e82e50a615ec and fixed in 7.1.11 with commit d83ecb7b96105d932dabaa56ccd7418c25fb7cbb
	Issue introduced in 6.0 with commit 26afbd826ee326e63a334c37fd45e82e50a615ec and fixed in 7.2.1 with commit 6fc540e835dddb518cef3ff522b780f701cd03df
	Issue introduced in 6.0 with commit 26afbd826ee326e63a334c37fd45e82e50a615ec and fixed in 7.3-rc1 with commit 0acd4eeb4b225b9bebbf9ef96cc10cdd79b94899

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-80763
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	net/bluetooth/hci_event.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/9e05783d0bb96a7b853cc058a7c7de2dc4a62154
	https://git.kernel.org/stable/c/26741d178f31932c9018b36b7953e6dc391436a4
	https://git.kernel.org/stable/c/a34df5c4a439cfc04565fa5be608ed1e53134f1f
	https://git.kernel.org/stable/c/e3f82e8f2a5915f533b57a065e9a045aa2ee03bc
	https://git.kernel.org/stable/c/d83ecb7b96105d932dabaa56ccd7418c25fb7cbb
	https://git.kernel.org/stable/c/6fc540e835dddb518cef3ff522b780f701cd03df
	https://git.kernel.org/stable/c/0acd4eeb4b225b9bebbf9ef96cc10cdd79b94899