vulnerability
Ubuntu: (CVE-2022-49558): linux vulnerability
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 5 | (AV:L/AC:L/Au:S/C:N/I:N/A:C) | Feb 26, 2025 | Mar 19, 2025 | Oct 23, 2025 |
Description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: double hook unregistration in netns path
__nft_release_hooks() is called from pre_netns exit path which
unregisters the hooks, then the NETDEV_UNREGISTER event is triggered
which unregisters the hooks again.
[ 565.221461] WARNING: CPU: 18 PID: 193 at net/netfilter/core.c:495 __nf_unregister_net_hook+0x247/0x270
[...]
[ 565.246890] CPU: 18 PID: 193 Comm: kworker/u64:1 Tainted: G E 5.18.0-rc7+ #27
[ 565.253682] Workqueue: netns cleanup_net
[ 565.257059] RIP: 0010:__nf_unregister_net_hook+0x247/0x270
[...]
[ 565.297120] Call Trace:
[ 565.300900] <TASK>
[ 565.304683] nf_tables_flowtable_event+0x16a/0x220 [nf_tables]
[ 565.308518] raw_notifier_call_chain+0x63/0x80
[ 565.312386] unregister_netdevice_many+0x54f/0xb50
Unregister and destroy netdev hook from netns pre_exit via kfree_rcu
so the NETDEV_UNREGISTER path see unregistered hooks.
Solutions
References
- CVE-2022-49558
- https://attackerkb.com/topics/CVE-2022-49558
- URL-https://git.kernel.org/linus/f9a43007d3f7ba76d5e7f9421094f00f2ef202f8
- URL-https://git.kernel.org/stable/c/3fac8ce48fa9fd61ee9056d3ed48b2edefca8b82
- URL-https://git.kernel.org/stable/c/86c0154f4c3a56c5db8b9dd09e3ce885382c2c19
- URL-https://git.kernel.org/stable/c/9c413a8c8bb49cc16796371805ecb260e885bb2b
- URL-https://git.kernel.org/stable/c/a3940dcf552f2393d1e8f263b386593f98abe829
- URL-https://git.kernel.org/stable/c/b09e6ccf0d12f9356e8e3508d3e3dce126298538
- URL-https://git.kernel.org/stable/c/c73955a09408e7374d9abfd0e78ce3de9cda0635
- URL-https://git.kernel.org/stable/c/f9a43007d3f7ba76d5e7f9421094f00f2ef202f8
- URL-https://www.cve.org/CVERecord?id=CVE-2022-49558
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