CVE-2026-100081: Linux kernel · xen-netback: defer xenvif_mcast_addr_list_free()
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 10 Nov 2026, 07:10 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 6 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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 9 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10linuxpkg:deb/ubuntu/linux?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-oraclepkg:deb/ubuntu/linux-oracle?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix has been implemented as part of the XSA-527 advisory, which defers the xenvif_mcast_addr_list_free() call until after all TX/RX processing has stopped. Users should apply the official patches or updated kernel versions that include this fix. No additional mitigation steps are indicated.
Description
CVE-2026-100081 is a vulnerability in the Linux kernel's xen-netback component involving improper timing of the xenvif_mcast_addr_list_free() function call. The fix involves deferring this function until after all transmit and receive processing has completed to ensure proper synchronization. This vulnerability affects specific Linux kernel versions and has been addressed in the XSA-527 advisory.
References
- ubuntu.com/security/CVE-2026-100081 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-100081 (opens in a new tab)
- git.kernel.org/stable/c/96e05a8ce243e2207704e2e7a6e7d1172730f515 (opens in a new tab)
- git.kernel.org/stable/c/fb38fc58acb26d74fe8f7b19621fafaae3c040ff (opens in a new tab)
- git.kernel.org/stable/c/a6bb2f1fa62c56279bdcdadce28d1310c5e12b62 (opens in a new tab)
- git.kernel.org/stable/c/0e786123e46d08d2247ce93a5435e45ed9f4c5d1 (opens in a new tab)
- git.kernel.org/stable/c/34f0f63dc6dc11895a17bb5672451b6b11622c99 (opens in a new tab)
- git.kernel.org/stable/c/990d123d9eaa3ac6c979eed245658676d65ce0db (opens in a new tab)
- git.kernel.org/stable/c/0d515c409033c8e2a645a781be3ca76ab825fc8c (opens in a new tab)