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CVE-2026-43219 Linux CVE debrief

A vulnerability was found in the Linux kernel's net: cpsw_new. The issue arises when an error occurs during register_netdev() for the first MAC in cpsw_register_ports(). This can cause cpsw_unregister_ports() to attempt to unregister the second MAC, which has not been registered yet. To fix this, a check for ndev->reg_state before calling unregister_netdev() was added.

Vendor
Linux
Product
Unknown
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-06
Original CVE updated
2026-06-09
Advisory published
2026-05-06
Advisory updated
2026-06-09

Who should care

Users of the Linux kernel, particularly those using versions between 5.5 and 6.18.16, or 6.19 up to 6.19.6, should be aware of this vulnerability.

Technical summary

The vulnerability has a CVSS score of 5.5 and a severity of MEDIUM. The CVSS vector is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. The CWE is NVD-CWE-noinfo.

Defensive priority

MEDIUM

Recommended defensive actions

  • Apply patches from the Linux kernel repository [ref-5], [ref-6], [ref-7], [ref-4].
  • Update to a Linux kernel version outside the vulnerable ranges: before 5.5 or 6.18.16 and later, or 6.19.6 and later.

Evidence notes

The CVE record [cve-org] and NVD detail [nvd] provide official information about the vulnerability.

Official resources

CVE-2026-43219 was published on 2026-05-06 and modified on 2026-06-09.