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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
2026-07-04
Advisory published
2026-05-06
Advisory updated
2026-07-04

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-43219 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-43219

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-43219 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-43219

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/14645799ad5253a028cf662e2f9cd18a68f74b31

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Mitigation or vendor reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/29739ec197ed66535bc0b86f14ab66c5f4512138

    416baaa9-dc9f-4396-8d5f-8c081fb06d67 - Patch

  • Mitigation or vendor reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/349c4cac6f54a81fc107589771f88136a2b20415

    416baaa9-dc9f-4396-8d5f-8c081fb06d67 - Patch

  • Mitigation or vendor reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/9d724b34fbe13b71865ad0906a4be97571f19cf5

    416baaa9-dc9f-4396-8d5f-8c081fb06d67 - Patch

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.