NFC: NULL out the dev->rfkill to prevent UAF(CVE-2022-49505)

概要

NFC: NULL out the dev->rfkill to prevent UAF

原文の説明

取得元が公開している説明をそのまま載せています (多くは英語)。

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

NFC: NULL out the dev->rfkill to prevent UAF

Commit 3e3b5dfcd16a ("NFC: reorder the logic in nfc_{un,}register_device")
assumes the device_is_registered() in function nfc_dev_up() will help
to check when the rfkill is unregistered. However, this check only
take effect when device_del(&dev->dev) is done in nfc_unregister_device().
Hence, the rfkill object is still possible be dereferenced.

The crash trace in latest kernel (5.18-rc2):

[ 68.760105] ==================================================================
[ 68.760330] BUG: KASAN: use-after-free in __lock_acquire+0x3ec1/0x6750
[ 68.760756] Read of size 8 at addr ffff888009c93018 by task fuzz/313
[ 68.760756]
[ 68.760756] CPU: 0 PID: 313 Comm: fuzz Not tainted 5.18.0-rc2 #4
[ 68.760756] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
[ 68.760756] Call Trace:
[ 68.760756]
[ 68.760756] dump_stack_lvl+0x57/0x7d
[ 68.760756] print_report.cold+0x5e/0x5db
[ 68.760756] ? __lock_acquire+0x3ec1/0x6750
[ 68.760756] kasan_report+0xbe/0x1c0
[ 68.760756] ? __lock_acquire+0x3ec1/0x6750
[ 68.760756] __lock_acquire+0x3ec1/0x6750
[ 68.760756] ? lockdep_hardirqs_on_prepare+0x410/0x410
[ 68.760756] ? register_lock_class+0x18d0/0x18d0
[ 68.760756] lock_acquire+0x1ac/0x4f0
[ 68.760756] ? rfkill_blocked+0xe/0x60
[ 68.760756] ? lockdep_hardirqs_on_prepare+0…

出典: OSV.dev (Open Source Vulnerabilities) NVD OSV

影響パッケージ

Linux Kernel

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.9.318"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.10.0"},{"fixed":"4.14.283"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"4.19.247"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.198"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.121"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.46"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"5.17.14"},{"fixed":"5.18.3"}]}]

ディストリビューション別の修正状況

各ディストリビューションが公開している、この CVE の修正パッケージ

Debian DEBIAN-CVE-2022-49505 linux 修正版: 5.10.127-1
Ubuntu UBUNTU-CVE-2022-49505 linux-azure 修正版: 4.15.0-1150.165~14.04.1

概要

原文の説明

影響パッケージ

ディストリビューション別の修正状況

参照URL