CVE-2022-49975 [High] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: bpf: Don't redirect packets with invalid pkt_len Syzbot found an issue [1]: fq_codel_drop() try to drop a flow whitout any skbs, that is, the flow->head is null. The root cause, as the [2] says, is because that bpf_prog_test_run_skb() run a bpf prog which redirects empty skbs. So we should determine whether the length of the packet modified by bpf prog or others like bpf_prog_test is valid before forwarding it directly.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-04-14	0.02%	0.10%	+0.08%
2	2025-06-18	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-04-14

0.02%

0.10%

+0.08%

2025-06-18

—

0.02%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.8	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	5.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.8

3.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

5.9

[email protected]

OS Trackers for CVE-2022-49975

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2022-49975 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-2022-49975
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2022-49975
`suse`	medium	CVE-2022-49975 severity moderate: SUSE including 277 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, …), 425 product×package rows across 44 product lines (Image SLES12-SP5-Azure-BYOS, Image SLES12-SP5-Azure-HPC-BYOS, … (44 product lines)): Known Affected 231, Known Not Affected 117, Fixed 77.	https://www.suse.com/security/cve/CVE-2022-49975/
`ubuntu`	medium	CVE-2022-49975 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 151, released 135, not-affected 99, needed 20, needs-triage 1.	https://ubuntu.com/security/CVE-2022-49975

Affected software / configurations for CVE-2022-49975

Vendor	Product	Version	Raw CPE
linux	linux_kernel	< 5.4.212	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.5, < 5.10.141	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.65	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 5.19.7	cpe:2.3:o:linux:linux_kernel::::::::

References for CVE-2022-49975

URL	Tags
https://git.kernel.org/stable/c/6204bf78b2a903b96ba43afff6abc0b04d6e0462	Patch
https://git.kernel.org/stable/c/72f2dc8993f10262092745a88cb2dd0fef094f23	Patch
https://git.kernel.org/stable/c/8b68e53d56697a59b5c53893b53f508bbdf272a0	Patch
https://git.kernel.org/stable/c/a75987714bd2d8e59840667a28e15c1fa5c47554	Patch
https://git.kernel.org/stable/c/fd1894224407c484f652ad456e1ce423e89bb3eb	Patch

URL

CVE-2022-49975 | bpf: Don't redirect packets with invalid pkt_len

Exploit prediction scoring system (EPSS) score for CVE-2022-49975

Common vulnerability scoring system (CVSS) metrics for CVE-2022-49975

Weakness enumeration for CVE-2022-49975

OS Trackers for CVE-2022-49975

Affected software / configurations for CVE-2022-49975

References for CVE-2022-49975