CVE-2022-49561 [Medium] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: re-fetch conntrack after insertion In case the conntrack is clashing, insertion can free skb->_nfct and set skb->_nfct to the already-confirmed entry. This wasn't found before because the conntrack entry and the extension space used to free'd after an rcu grace period, plus the race needs events enabled to trigger.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-04-06	0.03%	0.05%	+0.02%
2	2025-11-21	0.06%	0.03%	-0.03%
3	2025-11-18	—	0.06%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-04-06

0.03%

0.05%

+0.02%

2025-11-21

0.06%

0.03%

-0.03%

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-2022-49561

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2022-49561 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-2022-49561
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2022-49561
`suse`	medium	CVE-2022-49561 severity moderate: SUSE including 289 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 459 product×package rows across 46 product lines (Image SLES12-SP5-Azure-BYOS, Image SLES12-SP5-Azure-HPC-BYOS, … (46 product lines)): Known Affected 231, Known Not Affected 135, Fixed 93.	https://www.suse.com/security/cve/CVE-2022-49561/
`ubuntu`	medium	CVE-2022-49561 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, released 151, ignored 146, not-affected 109.	https://ubuntu.com/security/CVE-2022-49561

Affected software / configurations for CVE-2022-49561

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 4.7, < 4.14.282	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.15, < 4.19.246	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.20, < 5.4.197	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.5, < 5.10.120	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 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::::::::

References for CVE-2022-49561

URL	Tags
https://git.kernel.org/stable/c/01989d7eebb61c99bd4b88ebc8e261bd2f02caed	Patch
https://git.kernel.org/stable/c/04e4a11dc723c52db7a36dc58f0d69ce6426f8f0	Patch
https://git.kernel.org/stable/c/04f9e9104c969d8ce10a4a43634f641ed082092d	Patch
https://git.kernel.org/stable/c/56b14ecec97f39118bf85c9ac2438c5a949509ed	Patch
https://git.kernel.org/stable/c/91a36ec160ec1a0c8f5352b772dffcbb0b6023e3	Patch
https://git.kernel.org/stable/c/92a999d1963eed0df666284e20055136ceabd12f	Patch
https://git.kernel.org/stable/c/b16bb373988da3ceb0308381634117e18b6ec60d	Patch
https://git.kernel.org/stable/c/e97222b785e70e8973281666d709baad6523d8af	Patch

URL

CVE-2022-49561 | netfilter: conntrack: re-fetch conntrack after insertion

Exploit prediction scoring system (EPSS) score for CVE-2022-49561

Common vulnerability scoring system (CVSS) metrics for CVE-2022-49561

Weakness enumeration for CVE-2022-49561

OS Trackers for CVE-2022-49561

Affected software / configurations for CVE-2022-49561

References for CVE-2022-49561