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VulnerabilityPublished

CVE-2026-100081: Linux kernel · xen-netback: defer xenvif_mcast_addr_list_free()

Source GCVE Database

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Authoritative record:CVE-2026-100081

Not known to be exploited · fixed in fb38fc58acb26d74fe8f7b19621fafaae3c040ff : update Linux kernel when convenient.

Data as of 6 Nov 2026, 22:48 UTC

Severity
Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in fb38fc58acb26d74fe8f7b19621fafaae3c040ff, a6bb2f1fa62c56279bdcdadce28d1310c5e12b62, 990d123d9eaa3ac6c979eed245658676d65ce0db +4

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Nov 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 6 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ b17075d5c1988b83f840d272c795ac17d57ce804, < fb38fc58acb26d74fe8f7b19621fafaae3c040ff
Fixed in
  • fb38fc58acb26d74fe8f7b19621fafaae3c040ff
LinuxLinuxAffected
  • ≥ b17075d5c1988b83f840d272c795ac17d57ce804, < a6bb2f1fa62c56279bdcdadce28d1310c5e12b62
Fixed in
  • a6bb2f1fa62c56279bdcdadce28d1310c5e12b62
LinuxLinuxAffected
  • ≥ b17075d5c1988b83f840d272c795ac17d57ce804, < 990d123d9eaa3ac6c979eed245658676d65ce0db
Fixed in
  • 990d123d9eaa3ac6c979eed245658676d65ce0db
LinuxLinuxAffected
  • ≥ b17075d5c1988b83f840d272c795ac17d57ce804, < 96e05a8ce243e2207704e2e7a6e7d1172730f515
Fixed in
  • 96e05a8ce243e2207704e2e7a6e7d1172730f515
LinuxLinuxAffected
  • ≥ b17075d5c1988b83f840d272c795ac17d57ce804, < 34f0f63dc6dc11895a17bb5672451b6b11622c99
Fixed in
  • 34f0f63dc6dc11895a17bb5672451b6b11622c99
LinuxLinuxAffected
  • ≥ b17075d5c1988b83f840d272c795ac17d57ce804, < 0e786123e46d08d2247ce93a5435e45ed9f4c5d1
Fixed in
  • 0e786123e46d08d2247ce93a5435e45ed9f4c5d1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix for this vulnerability has been implemented by deferring the xenvif_mcast_addr_list_free() call to after the synchronization point in backend_disconnect(). Users should apply the official Linux kernel updates that include this fix. No additional mitigation actions are indicated.

Description

CVE-2026-100081 is a vulnerability in the Linux kernel's xen-netback component related to the improper timing of the xenvif_mcast_addr_list_free() function call. The fix involves deferring this function call to occur after all transmit and receive processing has stopped, ensuring proper synchronization and avoiding locking or RCU issues. This vulnerability is tracked as XSA-527.

References

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