CVE-2022-49776 [Medium] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: macvlan: enforce a consistent minimal mtu macvlan should enforce a minimal mtu of 68, even at link creation. This patch avoids the current behavior (which could lead to crashes in ipv6 stack if the link is brought up) $ ip link add macvlan1 link eno1 mtu 8 type macvlan # This should fail ! $ ip link sh dev macvlan1 5: macvlan1@eno1: <BROADCAST,MULTICAST> mtu 8 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ether 02:47:6c:24:74:82 brd ff:ff:ff:ff:ff:ff $ ip link set macvlan1 mtu 67 Error: mtu less than device minimum. $ ip link set macvlan1 mtu 68 $ ip link set macvlan1 mtu 8 Error: mtu less than device minimum.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-02-25	0.03%	0.05%	+0.02%
2	2025-11-08	0.07%	0.03%	-0.05%
3	2025-07-01	—	0.07%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-02-25

0.03%

0.05%

+0.02%

2025-11-08

0.07%

0.03%

-0.05%

2025-07-01

—

0.07%

—

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-2022-49776

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2022-49776 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-2022-49776
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2022-49776
`suse`	medium	—	https://www.suse.com/security/cve/CVE-2022-49776/
`ubuntu`	medium	CVE-2022-49776 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 154, ignored 146, not-affected 105, needs-triage 1.	https://ubuntu.com/security/CVE-2022-49776

Affected software / configurations for CVE-2022-49776

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 4.10, < 4.14.300	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.15, < 4.19.267	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.20, < 5.4.225	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.5, < 5.10.156	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.80	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 6.0.10	cpe:2.3:o:linux:linux_kernel::::::::

References for CVE-2022-49776

URL	Tags
https://git.kernel.org/stable/c/2b055c719d8f94c15ec9b7659978133030c6a353	Patch
https://git.kernel.org/stable/c/650137a7c0b2892df2e5b0bc112d7b09a78c93c8	Patch
https://git.kernel.org/stable/c/a62aa84fe19eb24d083d600a074c009a0a66d4f3	Patch
https://git.kernel.org/stable/c/b64085b00044bdf3cd1c9825e9ef5b2e0feae91a	Patch
https://git.kernel.org/stable/c/d2fee7d121d189c6dc905b727d60e7043a6655bb	Patch
https://git.kernel.org/stable/c/e41cbf98df22d08402e65174d147cbb187fe1a33	Patch
https://git.kernel.org/stable/c/e929ec98c0c3b10d9c07f3776df0c1a02d7a763e	Patch

URL

CVE-2022-49776 | macvlan: enforce a consistent minimal mtu

Exploit prediction scoring system (EPSS) score for CVE-2022-49776

Common vulnerability scoring system (CVSS) metrics for CVE-2022-49776

Weakness enumeration for CVE-2022-49776

OS Trackers for CVE-2022-49776

Affected software / configurations for CVE-2022-49776

References for CVE-2022-49776