01 Record

CVE-2021-47222

net: bridge: fix vlan tunnel dst refcnt when egressing

HighPUBLISHEDCNA: Linux

CNA base score7.8 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

View raw JSON

02 Description

net: bridge: fix vlan tunnel dst refcnt when egressing

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.25% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 16.0% of scored records. A rank, not a probability.

NVD base score

7.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-08-04.

Red Hat severity

Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2024-05-21 14:19Z2 YR AGO

Last updated

2026-08-05 08:46Z1 MO AGO

Reserved

2024-04-10

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

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

Weaknesses

CWE-416Use After FreeVariant

Data version

5.2

Document digest

cfbd12afbd82b47bd0db8b626ddb98c9a2e1276e90946dd73485629027424d33

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux11538d039ac6efcf4f1a6c536e1b87cd3668a9fd to < 42020f7f37a90d24b9551f5f7eba3f7c7c102968, 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd to < 84fc1c944e45ab317e2e70a0e7f76fa2a5e43b6e, 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd to < 79855be6445b6592bddb7bd7167083ec8cdbd73f, 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd to < fc7fdd8c5c2ad2fe3e297698be9d4dbe4a4e0579, 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd to < 25053a8404ba17ca48f5553d487afc1882e9f56c, 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd to < cfc579f9d89af4ada58c69b03bcaa4887840f3b3, 4.11—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/42020f7f37a90d24b9551f5f7eba3f7c7c102968
git.kernel.orghttps://git.kernel.org/stable/c/84fc1c944e45ab317e2e70a0e7f76fa2a5e43b6e
git.kernel.orghttps://git.kernel.org/stable/c/79855be6445b6592bddb7bd7167083ec8cdbd73f
git.kernel.orghttps://git.kernel.org/stable/c/fc7fdd8c5c2ad2fe3e297698be9d4dbe4a4e0579
git.kernel.orghttps://git.kernel.org/stable/c/25053a8404ba17ca48f5553d487afc1882e9f56c
git.kernel.orghttps://git.kernel.org/stable/c/cfc579f9d89af4ada58c69b03bcaa4887840f3b3

01 Record index

CVE-2021-47222

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2021-47222

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References