CVE-2026-100080: Linux kernel · xen-netback: Fix UAF when reading statistics data
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 10 Nov 2026, 07:11 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 is available that calls synchronize_net() before freeing the queue data to properly synchronize RCU state and prevent use-after-free conditions. Users should apply the official patches or updated kernel versions that include this fix. No additional mitigation steps are indicated.
Description
A use-after-free (UAF) vulnerability exists in the xen-netback driver of the Linux kernel when reading network statistics data. This occurs due to improper synchronization of RCU state during queue teardown after errors connecting to the frontend, potentially allowing access to freed or reused memory. The issue is fixed by calling synchronize_net() before freeing the queue data.
References
- ubuntu.com/security/CVE-2026-100080 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-100080 (opens in a new tab)
- git.kernel.org/stable/c/4223b33be49ee09acb6f1d26beb4a36dd3b8d63a (opens in a new tab)
- git.kernel.org/stable/c/ab9cdf1291be551da999510b30216a2886074d7a (opens in a new tab)
- git.kernel.org/stable/c/36f858f228e3f955b9336af7f94634747c221518 (opens in a new tab)
- git.kernel.org/stable/c/4867687b6ad28ab84bc0811d8f8f9972e769da02 (opens in a new tab)
- git.kernel.org/stable/c/89e534265b62c94749639350200b10370564bb3a (opens in a new tab)
- git.kernel.org/stable/c/6cd611d2abdd8623a554e14145f82c1cb4e4467a (opens in a new tab)
- git.kernel.org/stable/c/37d5a73170579b30e67cc8b19ec69715eea3a6b6 (opens in a new tab)