CVE-2026-100080 is a vulnerability in Linux Kernel
Published on November 6, 2026
xen-netback: Fix UAF when reading statistics data
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
Products Associated with CVE-2026-100080
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 4223b33be49ee09acb6f1d26beb4a36dd3b8d63a is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below ab9cdf1291be551da999510b30216a2886074d7a is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 36f858f228e3f955b9336af7f94634747c221518 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 89e534265b62c94749639350200b10370564bb3a is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 6cd611d2abdd8623a554e14145f82c1cb4e4467a is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 37d5a73170579b30e67cc8b19ec69715eea3a6b6 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 4867687b6ad28ab84bc0811d8f8f9972e769da02 is affected.
- Before 5.10.274 is affected.
- Before 5.15.225 is affected.
- Before 6.1.192 is affected.
- Before 6.6.162 is affected.
- Before 6.12.116 is affected.
- Before 6.18.62 is affected.
- Before 7.3.3 is affected.
- Version 5.10.274, <= 5.10.* is unaffected.
- Version 5.15.225, <= 5.15.* is unaffected.
- Version 6.1.192, <= 6.1.* is unaffected.
- Version 6.6.162, <= 6.6.* is unaffected.
- Version 6.12.116, <= 6.12.* is unaffected.
- Version 6.18.62, <= 6.18.* is unaffected.
- Version 7.3.3, <= 7.3.* is unaffected.