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01 Record

CVE-2026-19673

Out-of-bounds read and net_buf length underflow in Zephyr Ethernet L2 when parsing a truncated VLAN header

HighPUBLISHEDCNA: zephyr
CNA base score7.1 CVSS v3.xCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

02 Description

Out-of-bounds read and net_buf length underflow in Zephyr Ethernet L2 when parsing a truncated VLAN header

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
0.33% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 27.0% of scored records. A rank, not a probability.
NVD base score
7.1 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
NVD analysis status
Awaiting Analysis. NVD last modified this record on 2026-10-16.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

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
2026-10-14 16:45Z14 DAYS AGO
Last updated
2026-10-16 15:31Z12 DAYS AGO
Reserved
2026-08-12
Assigning CNA
zephyr
Record state
PUBLISHED
Severity
High (CVSS 7.1)
CNA CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Weaknesses
Data version
5.2
Document digest
282c896d28ec472a8579a8223474e2ed173c569572c7986f237b083d74e79eba

05 Affected products

VendorProductVersionsPlatforms
zephyrprojectzephyr1.12.0 to < 4.5.0—

06 References