cbcvebase.
CVE-2022-49696
published 2025-02-26

CVE-2022-49696: 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…

PriorityP338high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.29%
21.0th percentile
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 destroyed through tipc_exit_net(). But this function is not guaranteed the work is the last queued. So, the destroyed instance may be accessed in the work which will try to enqueue later. In order to completely fix, we re-order the calling of cancel_work_sync() to make sure the work tipc_net_finalize_work() was last queued and it must be completed by calling cancel_work_sync().

Affected

19 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 5.18.14-1 (bookworm)linux 5.18.14-1 (bookworm)
linuxlinux——
linuxlinux——
linuxlinux——
linuxlinux>= 5.4.83 < 5.55.5
linuxlinux>= 5.9.14 < 5.105.10
linuxlinux>= d966ddcc38217a6110a6a0ff37ad2dee7d42e23e < 361c5521c1e49843b710f455cae3c0a50b714323361c5521c1e49843b710f455cae3c0a50b714323
linuxlinux>= d966ddcc38217a6110a6a0ff37ad2dee7d42e23e < cd7789e659e84f137631dc1f5ec8d794f2700e6ccd7789e659e84f137631dc1f5ec8d794f2700e6c
linuxlinux>= d966ddcc38217a6110a6a0ff37ad2dee7d42e23e < 8b246ddd394d7d9640816611693b0096b998e27a8b246ddd394d7d9640816611693b0096b998e27a
linuxlinux>= d966ddcc38217a6110a6a0ff37ad2dee7d42e23e < 911600bf5a5e84bfda4d33ee32acc75ecf6159f0911600bf5a5e84bfda4d33ee32acc75ecf6159f0
linuxlinux_kernel——
linuxlinux_kernel>= 0 < 5.10.127-15.10.127-1
linuxlinux_kernel>= 0 < 5.18.14-15.18.14-1
linuxlinux_kernel>= 0 < 5.18.14-15.18.14-1
linuxlinux_kernel>= 0 < 5.18.14-15.18.14-1
linuxlinux_kernel>= 5.11 < 5.15.515.15.51
linuxlinux_kernel>= 5.16 < 5.18.85.18.8
linuxlinux_kernel>= 5.4.83 < 5.55.5
linuxlinux_kernel>= 5.9.14 < 5.10.1275.10.127

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv7.8HIGH
vendor_debian7.8HIGH
vendor_redhat7.8HIGH
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