Answer in brief
CVE-2026-100080 records a Unknown severity vulnerability in xen-netback: Fix UAF when reading statistics data. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4223b33be49ee09acb6f1d26beb4a36dd3b8d63a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ab9cdf1291be551da999510b30216a2886074d7a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <36f858f228e3f955b9336af7f94634747c221518 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <89e534265b62c94749639350200b10370564bb3a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6cd611d2abdd8623a554e14145f82c1cb4e4467a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <37d5a73170579b30e67cc8b19ec69715eea3a6b6 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4867687b6ad28ab84bc0811d8f8f9972e769da02 || >=0 <5.10.274 || >=0 <5.15.225 || >=0 <6.1.192 || >=0 <6.6.162 || >=0 <6.12.116 || >=0 <6.18.62 || >=0 <7.3.3 | 4223b33be49ee09acb6f1d26beb4a36dd3b8d63a, ab9cdf1291be551da999510b30216a2886074d7a, 36f858f228e3f955b9336af7f94634747c221518, 89e534265b62c94749639350200b10370564bb3a, 6cd611d2abdd8623a554e14145f82c1cb4e4467a, 37d5a73170579b30e67cc8b19ec69715eea3a6b6, 4867687b6ad28ab84bc0811d8f8f9972e769da02, 5.10.274, 5.15.225, 6.1.192, 6.6.162, 6.12.116, 6.18.62, 7.3.3 |
Published upstream
Nov 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 6, 2026
In the Linux kernel, the following vulnerability has been resolved: xen-netback: Fix UAF when reading statistics data The network statistic data in the driver is protected by RCU. Unfortunately when tearing down the queues after an error during connecting to the frontend (e.g. due to illegal Xenstore data filled in by the guest), the statistic data is being freed without synchronizing the RCU state. In case the data is being read via sysfs in this phase, access to already freed memory or memory being in new use is possible. Fix that by calling synchronize_net() before freeing the queue data. This is XSA-526 / CVE-2026-100080
Quoted source text, attributed separately from HOL analysis.