CVE-2026-99008
Received
Received - Intake
NULL Pointer Dereference in Linux Kernel Bluetooth RFCOMM
Vulnerability report for CVE-2026-99008, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-23
Last updated on: 2026-10-23
Assigner: kernel.org
Description
Description
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: RFCOMM: Fix NULL tty_dev dereference in rfcomm_dev_shutdown
syzbot hit a NULL pointer dereference in rfcomm_dev_shutdown() when an
RFCOMM tty is closed.
rfcomm_dev_add() puts the new device on rfcomm_dev_list first and only
then registers the tty device and saves it in dev->tty_dev. If that
registration fails, dev->tty_dev is never set at all. The device can be
looked up in the meantime, so an open() of /dev/rfcommN gets through
rfcomm_tty_install() and attaches to it. When that tty is closed again,
rfcomm_dev_shutdown() uses dev->tty_dev without checking it:
Oops: general protection fault, probably for non-canonical address
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
RIP: 0010:rfcomm_dev_shutdown+0x48/0xb0 net/bluetooth/rfcomm/tty.c:131
Call Trace:
tty_port_shutdown+0x1bf/0x220 drivers/tty/tty_port.c:372
tty_port_close+0x4e/0x150 drivers/tty/tty_port.c:705
tty_release+0x359/0x1670 drivers/tty/tty_io.c:1718
__fput+0x418/0xa50 fs/file_table.c:512
rfcomm_dev_destruct() already copes with a NULL dev->tty_dev. Add the
same check to rfcomm_dev_shutdown(), so the tty device is only moved
when it was actually registered.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | cad348a17e170451ea8688b532a6ca3e98c63b60 |
| Linux | Linux | cad348a17e170451ea8688b532a6ca3e98c63b60 |
| Linux | Linux | cad348a17e170451ea8688b532a6ca3e98c63b60 |
| Linux | Linux | cad348a17e170451ea8688b532a6ca3e98c63b60 |
| Linux | Linux | cad348a17e170451ea8688b532a6ca3e98c63b60 |
| Linux | Linux | 3.12 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
