CVE-2022-49558 [Medium] | Security Vulnerability in Linux Kernel

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.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-12-23	0.04%	0.05%	+0.01%
2	2025-11-21	0.06%	0.04%	-0.01%
3	2025-11-18	—	0.06%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-12-23

0.04%

0.05%

+0.01%

2025-11-21

0.06%

0.04%

-0.01%

2025-11-18

—

0.06%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.5	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.5

3.1

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

3.6

[email protected]

OS Trackers for CVE-2022-49558

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2022-49558 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2022-49558
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2022-49558
`suse`	medium	CVE-2022-49558 severity moderate: SUSE including 26 source package names (cluster-md-kmp-default, dlm-kmp-default, …), 198 product×package rows across 36 product lines (SLES-LTSS-TERADATA 15 SP2, SUSE Linux Enterprise High Availability Extension 12 SP5, … (36 product lines)): Known Not Affected 198.	https://www.suse.com/security/cve/CVE-2022-49558/
`ubuntu`	medium	CVE-2022-49558 medium priority: Ubuntu including 158 source packages (linux, linux-allwinner-5.19, …), 1551 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1145, ignored 146, released 136, not-affected 124.	https://ubuntu.com/security/CVE-2022-49558

Affected software / configurations for CVE-2022-49558

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 5.4.99, < 5.4.262	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.10.17, < 5.10.198	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11.1, < 5.15.45	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 5.17.13	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.18, < 5.18.2	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	5.11	cpe:2.3:o:linux:linux_kernel:5.11:-::::::

References for CVE-2022-49558

URL	Tags
https://git.kernel.org/stable/c/3fac8ce48fa9fd61ee9056d3ed48b2edefca8b82	Patch
https://git.kernel.org/stable/c/86c0154f4c3a56c5db8b9dd09e3ce885382c2c19	Patch
https://git.kernel.org/stable/c/9c413a8c8bb49cc16796371805ecb260e885bb2b	Patch
https://git.kernel.org/stable/c/a3940dcf552f2393d1e8f263b386593f98abe829	Patch
https://git.kernel.org/stable/c/b09e6ccf0d12f9356e8e3508d3e3dce126298538	Patch
https://git.kernel.org/stable/c/f9a43007d3f7ba76d5e7f9421094f00f2ef202f8	Patch

URL

CVE-2022-49558 | netfilter: nf_tables: double hook unregistration in netns path

Exploit prediction scoring system (EPSS) score for CVE-2022-49558

Common vulnerability scoring system (CVSS) metrics for CVE-2022-49558

Weakness enumeration for CVE-2022-49558

OS Trackers for CVE-2022-49558

Affected software / configurations for CVE-2022-49558

References for CVE-2022-49558