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CVE-2026-98377VulnerabilityPublished Updated

Microsoft · vlan: require the MAC header to be present in __vlan_insert_inner_tag()

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-98377· High

Not known to be exploited · fixed in f42562dd027dc4ed103fae17b2206e73ea1963c4 : patch Microsoft soon.

Data as of 7 Nov 2026, 12:19 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in f42562dd027dc4ed103fae17b2206e73ea1963c4, aecace4ef31bd4e8ca1f224280ab52a457b0dc9a, ab888242fce4f16f6c4d4c6ec53939ad36aa3b3a +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 7 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f42562dd027dc4ed103fae17b2206e73ea1963c4
Fixed in
  • f42562dd027dc4ed103fae17b2206e73ea1963c4
LinuxLinuxAffected
  • ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < aecace4ef31bd4e8ca1f224280ab52a457b0dc9a
Fixed in
  • aecace4ef31bd4e8ca1f224280ab52a457b0dc9a
LinuxLinuxAffected
  • ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < ab888242fce4f16f6c4d4c6ec53939ad36aa3b3a
Fixed in
  • ab888242fce4f16f6c4d4c6ec53939ad36aa3b3a
LinuxLinuxAffected
  • ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 12295e0728488105b152b57fe8bc5e86f1d21a73
Fixed in
  • 12295e0728488105b152b57fe8bc5e86f1d21a73
LinuxLinuxAffected
  • ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 59af43ccece4d2d8b62e9e3ccc96b6e2e793bcdc
Fixed in
  • 59af43ccece4d2d8b62e9e3ccc96b6e2e793bcdc
LinuxLinuxAffected
  • ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 50a958f865173e8752ff07bf0eff7b55cdeb5d74
Fixed in
  • 50a958f865173e8752ff07bf0eff7b55cdeb5d74

Description

To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

References

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