This bug was fixed in the package linux-oem-5.10 - 5.10.0-1052.54
---------------
linux-oem-5.10 (5.10.0-1052.54) focal; urgency=medium
* focal/linux-oem-5.10: 5.10.0-1052.54 -proposed tracker (LP:
#1949843)
* creat09 from ubuntu_ltp_syscalls and cve-2018-13405 from ubuntu_ltp/cve
failed with XFS (LP: #1950239)
- xfs: fix up non-directory creation in SGID directories
* Let NVMe with HMB use native power control again (LP: #1950042)
- nvme-pci: use attribute group for cmb sysfs
- nvme-pci: cmb sysfs: one file, one value
- nvme-pci: disable hmb on idle suspend
- nvme: allow user toggling hmb usage
* require CAP_NET_ADMIN to attach N_HCI ldisc (LP: #1949516)
- Bluetooth: hci_ldisc: require CAP_NET_ADMIN to attach N_HCI ldisc
-- Chia-Lin Kao (AceLan) <acelan....@canonical.com> Tue, 23 Nov 2021
15:29:37 +0800
** Changed in: linux-oem-5.10 (Ubuntu Focal)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1949516
Title:
require CAP_NET_ADMIN to attach N_HCI ldisc
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux source package in Bionic:
Fix Released
Status in linux-oem-5.10 source package in Bionic:
Invalid
Status in linux source package in Focal:
Fix Released
Status in linux-oem-5.10 source package in Focal:
Fix Released
Status in linux source package in Hirsute:
Fix Released
Status in linux-oem-5.10 source package in Hirsute:
Invalid
Status in linux source package in Impish:
Fix Released
Status in linux-oem-5.10 source package in Impish:
Invalid
Status in linux source package in Jammy:
In Progress
Status in linux-oem-5.10 source package in Jammy:
Invalid
Bug description:
[Impact]
Any unprivileged user can attach N_HCI ldisc and send packets coming from a
virtual controller by using PTYs. This exposes attack surface on systems
where bluetooth is not needed or even allow local attacks that would otherwise
require physical proximity.
[Test case]
Try attaching N_HCI ldisc to a tty.
ldattach HCI /dev/tty
[Potential regression]
Users who rely on programs using N_HCI line discipline in order to emulate or
proxy a bluetooth controller will require privilege they may not have.
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