概要

tipc: fix use-after-free Read in tipc_named_reinit

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:

tipc: fix use-after-free Read in tipc_named_reinit

syzbot found the following issue on:

BUG: KASAN: use-after-free in tipc_named_reinit+0x94f/0x9b0
net/tipc/name_distr.c:413
Read of size 8 at addr ffff88805299a000 by task kworker/1:9/23764

CPU: 1 PID: 23764 Comm: kworker/1:9 Not tainted
5.18.0-rc4-syzkaller-00878-g17d49e6e8012 #0
Hardware name: Google Compute Engine/Google Compute Engine,
BIOS Google 01/01/2011
Workqueue: events tipc_net_finalize_work
Call Trace:

__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0xeb/0x495
mm/kasan/report.c:313
print_report mm/kasan/report.c:429 [inline]
kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
tipc_named_reinit+0x94f/0x9b0 net/tipc/name_distr.c:413
tipc_net_finalize+0x234/0x3d0 net/tipc/net.c:138
process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

[...]

In the commit
d966ddcc3821 ("tipc: fix a deadlock when flushing scheduled work"),
the cancel_work_sync() function just to make sure ONLY the work
tipc_net_finalize_work() is executing/pending on any CPU completed before
tipc namespace is de…

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

影響パッケージ

Linux Kernel

[{"type":"ECOSYSTEM","events":[{"introduced":"5.10.0"},{"fixed":"5.10.127"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.51"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"5.18.8"}]}]

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-2022-49696 linux 修正版: 5.10.127-1
Ubuntu UBUNTU-CVE-2022-49696 linux-hwe-edge