CVE-2026-100080: Linux kernel · xen-netback: Fix UAF when reading statistics data
Source GCVE Database
Not known to be exploited · fixed in ab9cdf1291be551da999510b30216a2886074d7a : update Linux kernel when convenient.
Data as of 6 Nov 2026, 22:43 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
Thin evidence
One scorer or none- Patch
- Available – fixed in ab9cdf1291be551da999510b30216a2886074d7a, 4867687b6ad28ab84bc0811d8f8f9972e769da02, 4223b33be49ee09acb6f1d26beb4a36dd3b8d63a +11
Exploitation 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 6 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
Debiandebian/linuxpkg:deb/debian/linuxOther 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, preventing use-after-free conditions. Users should apply the official Linux kernel update that includes this fix. No additional mitigation steps are indicated.
Description
A use-after-free (UAF) vulnerability in the xen-netback driver of the Linux kernel was fixed. The issue occurs when network statistic data, protected by RCU, is freed without proper synchronization during queue teardown after an error connecting to the frontend. This can lead to access of freed or reused memory if the data is read concurrently via sysfs. The fix involves calling synchronize_net() before freeing the queue data to ensure safe memory access.
References
- nvd.nist.gov/vuln/detail/CVE-2026-100080 (opens in a new tab)
- git.kernel.org/stable/c/36f858f228e3f955b9336af7f94634747c221518 (opens in a new tab)
- git.kernel.org/stable/c/37d5a73170579b30e67cc8b19ec69715eea3a6b6 (opens in a new tab)
- git.kernel.org/stable/c/4223b33be49ee09acb6f1d26beb4a36dd3b8d63a (opens in a new tab)
- git.kernel.org/stable/c/4867687b6ad28ab84bc0811d8f8f9972e769da02 (opens in a new tab)
- git.kernel.org/stable/c/6cd611d2abdd8623a554e14145f82c1cb4e4467a (opens in a new tab)
- git.kernel.org/stable/c/89e534265b62c94749639350200b10370564bb3a (opens in a new tab)
- git.kernel.org/stable/c/ab9cdf1291be551da999510b30216a2886074d7a (opens in a new tab)
- openwall.com/lists/oss-security/2026/11/06/9 (opens in a new tab)
- xenbits.xen.org/xsa/advisory-526.html (opens in a new tab)