CVE-2022-49110 [Medium] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: revisit gc autotuning as of commit 4608fdfc07e1 ("netfilter: conntrack: collect all entries in one cycle") conntrack gc was changed to run every 2 minutes. On systems where conntrack hash table is set to large value, most evictions happen from gc worker rather than the packet path due to hash table distribution. This causes netlink event overflows when events are collected. This change collects average expiry of scanned entries and reschedules to the average remaining value, within 1 to 60 second interval. To avoid event overflows, reschedule after each bucket and add a limit for both run time and number of evictions per run. If more entries have to be evicted, reschedule and restart 1 jiffy into the future.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-04-12	0.07%	0.01%	-0.06%
2	2026-04-06	0.04%	0.07%	+0.03%
3	2025-02-27	—	0.04%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-04-12

0.07%

0.01%

-0.06%

2026-04-06

0.04%

0.07%

+0.03%

2025-02-27

—

0.04%

—

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-2022-49110

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2022-49110 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 4, open 1.	https://security-tracker.debian.org/tracker/CVE-2022-49110
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2022-49110
`suse`	medium	—	https://www.suse.com/security/cve/CVE-2022-49110/
`ubuntu`	medium	CVE-2022-49110 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, not-affected 130, released 108, needed 22.	https://ubuntu.com/security/CVE-2022-49110

Affected software / configurations for CVE-2022-49110

Vendor	Product	Version	Raw CPE
linux	linux_kernel	< 5.15.34	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 5.16.20	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.17, < 5.17.3	cpe:2.3:o:linux:linux_kernel::::::::

References for CVE-2022-49110

URL	Tags
https://git.kernel.org/stable/c/2cfadb761d3d0219412fd8150faea60c7e863833	Patch
https://git.kernel.org/stable/c/58d52743ae85d28c9335c6034d6ce350b8689951	Patch
https://git.kernel.org/stable/c/592e57591826f3d09c28d755a39ea8e9d13705ad	Patch
https://git.kernel.org/stable/c/7cd361d5e6d986c0d4cafb9ceaa803359048ae15	Patch

URL

CVE-2022-49110 | netfilter: conntrack: revisit gc autotuning

Exploit prediction scoring system (EPSS) score for CVE-2022-49110

Common vulnerability scoring system (CVSS) metrics for CVE-2022-49110

Weakness enumeration for CVE-2022-49110

OS Trackers for CVE-2022-49110

Affected software / configurations for CVE-2022-49110

References for CVE-2022-49110