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CVE-2026-100081ImportantLocalRevised 14 Nov

xen-netback: defer xenvif_mcast_addr_list_free()

No KEV listing collectedCVSS 7.8Fix not stated
MSRC advisory NVD CVE.org

Assessment

Severity
Important
CVSS base score
7.8
Impact
Not stated
Exploitation detected
Unknown: not stated by MSRC
Exploitability
Not assessed
Publicly disclosed
Unknown: not stated by MSRC
EPSS · 30-day forecast
No EPSS score collected
Customer action
Required: follow the MSRC remediation guidance
More details
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Public detection template
No Nuclei template is listed in the current collected catalog
Component
Mariner
Weakness
—
Issued by
Linux
Published
8 Nov 2026 · November 2026
Last revised
14 Nov 2026Information published.
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
LocalAV:L
Attack complexity
HighAC:H
Privileges required
LowPR:L
User interaction
NoneUI:N
Scope
ChangedS:C
Confidentiality
HighC:H
Integrity
HighI:H
Availability
HighA:H

Updates that fix it

0 KBs

No KB listed

No KB update is listed in the collected MSRC record. Check the MSRC advisory for product releases and other remedies.

Affected products

Open Source Software
3 affected products
  • azl3 kernel 6.6.161.1-1 on Azure Linux 3.0
  • azl4 kernel 6.18.57-1.6.azl4 on Azure Linux 4.0
  • azl4 kernel 6.18.57-1.7.azl4 on Azure Linux 4.0

What changed

  1. Affected products: azl3 kernel 6.6.161.1-1 on Azure Linux 3.0, azl4 kernel 6.18.57-1.6.azl4 on Azure Linux 4.0 → azl3 kernel 6.6.161.1-1 on Azure Linux 3.0, azl4 kernel 6.18.57-1.6.azl4 on Azure Linux 4.0, azl4 kernel 6.18.57-1.7.azl4 on Azure Linux 4.0
  2. Affected products: azl3 kernel 6.6.161.1-1 on Azure Linux 3.0 → azl3 kernel 6.6.161.1-1 on Azure Linux 3.0, azl4 kernel 6.18.57-1.6.azl4 on Azure Linux 4.0 · CVSS vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H → CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H · CVSS score: 6.0 → 7.8 · Severity: Moderate → Important
  3. Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  4. Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
Page history

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Cite this version
Field-level log (15)

Up to 100 recent field edits are shown; older edits may be outside retention.

  1. 15 Nov 2026 · 08:08:43 UTC Last revised13 Nov 2026 20:44 UTC → 14 Nov 2026 09:57 UTC
  2. 15 Nov 2026 · 08:08:43 UTC Affected productsazl3 kernel 6.6.161.1-1 on Azure Linux 3.0, azl4 kernel 6.18.57-1.6.azl4 on Azure Linux 4.0 → azl3 kernel 6.6.161.1-1 on Azure Linux 3.0, azl4 kernel 6.18.57-1.6.azl4 on Azure Linux 4.0, azl4 kernel 6.18.57-1.7.azl4 on Azure Linux 4.0
  3. 14 Nov 2026 · 08:16:23 UTC Last revised9 Nov 2026 14:42 UTC → 13 Nov 2026 20:44 UTC
  4. 14 Nov 2026 · 08:16:23 UTC Affected productsazl3 kernel 6.6.161.1-1 on Azure Linux 3.0 → azl3 kernel 6.6.161.1-1 on Azure Linux 3.0, azl4 kernel 6.18.57-1.6.azl4 on Azure Linux 4.0
  5. 14 Nov 2026 · 08:16:23 UTC CVSS vectorCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H → CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
  6. 14 Nov 2026 · 08:16:23 UTC CVSS base score6.0 → 7.8
  7. 14 Nov 2026 · 08:16:23 UTC SeverityModerate → Important
  8. 13 Nov 2026 · 12:10:20 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  9. 13 Nov 2026 · 12:10:20 UTC Source coverage: public-exploit-codeIncomplete → Current
  10. 13 Nov 2026 · 12:10:20 UTC Source coverage: first-epssIncomplete → Current
  11. 13 Nov 2026 · 12:10:20 UTC Source coverage: msrc-cvrfIncomplete → Current
  12. 13 Nov 2026 · 11:07:20 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  13. 13 Nov 2026 · 11:07:20 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  14. 13 Nov 2026 · 11:07:20 UTC Source coverage: first-epssCurrent → Incomplete
  15. 13 Nov 2026 · 11:07:20 UTC Source coverage: msrc-cvrfCurrent → Incomplete

Explore global source statements, affected packages and advisory history for CVE-2026-100081. The catalog has a separate collection scope from Microsoft release records.

More advisories, affected versions and source history

Exploitation and risk

Source status

CISA KEV lists vulnerabilities known to be exploited. FIRST EPSS estimates the likelihood of exploitation in the next 30 days. An unavailable score does not mean zero risk.

Which CVEs have scores here?

This view includes predictions for CVE identifiers explicitly listed in public NuGet advisories. Microsoft release pages have their own prediction coverage. Check source status for the scope and latest checks.

No exploitation or prediction data is available here for these CVEs. This does not mean they are safe or unlikely to be exploited.

cve-program · CVE-2026-100081

Published

xen-netback: defer xenvif_mcast_addr_list_free()

In the Linux kernel, the following vulnerability has been resolved: xen-netback: defer xenvif_mcast_addr_list_free() In order for the function to legitimately avoid locking/RCU, it needs to run after all TX/RX processing has finished/stopped: Lookups happen from xenvif_start_xmit(), while adds/removes happen from xenvif_tx_action() (called out of xenvif_poll()). Move the call out of xenvif_disconnect_data() (the call to the function from connect()'s error path doesn't require any cleaning up there), and put it past the synchronization point in backend_disconnect(). This is XSA-527 / CVE-2026-100081.

Source published
6 Nov 2026 18:23:02 UTC
Source modified
13 Nov 2026 14:17:19 UTC
Saved here
13 Nov 2026 15:56:54 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 7.8 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

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