CVE-2026-100080 json
xen-netback: Fix UAF when reading statistics data
published 2026-11-06 2 d ago modified 2026-11-06 2 d ago also EUVD-2026-118399
- cvss
- —
- not scored
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 18%
- public exploits
- 0
- none known
Summary
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
Patch / fix
- Linux Linux 5.10.274, 5.15.225, 6.1.192, 6.6.162, 6.12.116, 6.18.62, 7.3.3
- linux Debian 13 6.12.116-1
debian advisories DEBIAN-CVE-2026-100080
- git.kernel.org/stable/c/4223b33be49ee09acb6f1d26beb4a36dd3b8d63a commit
- git.kernel.org/stable/c/ab9cdf1291be551da999510b30216a2886074d7a commit
- git.kernel.org/stable/c/36f858f228e3f955b9336af7f94634747c221518 commit
- git.kernel.org/stable/c/89e534265b62c94749639350200b10370564bb3a commit
- git.kernel.org/stable/c/6cd611d2abdd8623a554e14145f82c1cb4e4467a commit
- git.kernel.org/stable/c/37d5a73170579b30e67cc8b19ec69715eea3a6b6 commit
- git.kernel.org/stable/c/4867687b6ad28ab84bc0811d8f8f9972e769da02 commit
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-100080 updated cvss 5.6
kernel: kernel: xen-netback: Denial of Service via use-after-free during queue teardown
-
Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernel Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9not affected: vulnerable code not present
+1 more productsfewer
Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9, openshift/ose-rhel-coreos-10
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
0.27% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).
Affected products
- Linux Linux
Classification
- Technology feeds
References
- git.kernel.org /stable/c/4223b33be49ee09acb6f1d26beb4a36dd3b8d63a
- git.kernel.org /stable/c/ab9cdf1291be551da999510b30216a2886074d7a
- git.kernel.org /stable/c/36f858f228e3f955b9336af7f94634747c221518
- git.kernel.org /stable/c/89e534265b62c94749639350200b10370564bb3a
- git.kernel.org /stable/c/6cd611d2abdd8623a554e14145f82c1cb4e4467a
- git.kernel.org /stable/c/37d5a73170579b30e67cc8b19ec69715eea3a6b6
- git.kernel.org /stable/c/4867687b6ad28ab84bc0811d8f8f9972e769da02
- openwall.com /lists/oss-security/2026/11/06/9
- xenbits.xen.org /xsa/advisory-526.html
Sources
- CVE List CVE-2026-100080
- NVD CVE-2026-100080
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