CVE-2023-28464

2023-03-3100:00:00

ubuntu.com

linux kernel

hci_conn_cleanup

use-after-free

privilege escalation

net/bluetooth

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.3 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

5.1%

JSON

hci_conn_cleanup in net/bluetooth/hci_conn.c in the Linux kernel through
6.2.9 has a use-after-free (observed in hci_conn_hash_flush) because of
calls to hci_dev_put and hci_conn_put. There is a double free that may lead
to privilege escalation.

Bugs

Notes

Author	Note
sbeattie	both the introducing commit 0f00cd322d22 (“Bluetooth: Free potentially unfreed SCO connection”) and the fixing commit 5dc7d23e167e (“Bluetooth: hci_conn: Fix possible UAF”) were pulled into the upstream stable v6.2.12 kernel, so 6.2.y kernel users were never affected by this issue. Upstream commit a85fb91e3d72 (“Bluetooth: Fix double free in hci_conn_cleanup”) (6.7-rc1) also claims to fix this CVE, not clear if this is a typo or was a followup fix, because the original was incomplete.

Author

Note

sbeattie

both the introducing commit 0f00cd322d22 (“Bluetooth: Free potentially unfreed SCO connection”) and the fixing commit 5dc7d23e167e (“Bluetooth: hci_conn: Fix possible UAF”) were pulled into the upstream stable v6.2.12 kernel, so 6.2.y kernel users were never affected by this issue. Upstream commit a85fb91e3d72 (“Bluetooth: Fix double free in hci_conn_cleanup”) (6.7-rc1) also claims to fix this CVE, not clear if this is a typo or was a followup fix, because the original was incomplete.