xen-netback: Fix UAF when reading statistics data
Summary
| CVE | CVE-2026-100080 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-11-06 19:17:03 UTC |
| Updated | 2026-11-06 19:17:03 UTC |
| Description | 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 |
Risk And Classification
EPSS: 0.002670000 probability, percentile 0.189080000 (date 2026-11-08)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 4223b33be49ee09acb6f1d26beb4a36dd3b8d63a git | Not specified |
| CNA | Linux | Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ab9cdf1291be551da999510b30216a2886074d7a git | Not specified |
| CNA | Linux | Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 36f858f228e3f955b9336af7f94634747c221518 git | Not specified |
| CNA | Linux | Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 89e534265b62c94749639350200b10370564bb3a git | Not specified |
| CNA | Linux | Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 6cd611d2abdd8623a554e14145f82c1cb4e4467a git | Not specified |
| CNA | Linux | Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 37d5a73170579b30e67cc8b19ec69715eea3a6b6 git | Not specified |
| CNA | Linux | Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 4867687b6ad28ab84bc0811d8f8f9972e769da02 git | Not specified |
| CNA | Linux | Linux | affected 5.10.274 semver | Not specified |
| CNA | Linux | Linux | affected 5.15.225 semver | Not specified |
| CNA | Linux | Linux | affected 6.1.192 semver | Not specified |
| CNA | Linux | Linux | affected 6.6.162 semver | Not specified |
| CNA | Linux | Linux | affected 6.12.116 semver | Not specified |
| CNA | Linux | Linux | affected 6.18.62 semver | Not specified |
| CNA | Linux | Linux | affected 7.3.3 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.274 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.225 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.192 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.162 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.116 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.62 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.3.3 7.3.* semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| xenbits.xen.org/xsa/advisory-526.html | af854a3a-2127-422b-91ae-364da2661108 | xenbits.xen.org | |
| git.kernel.org/stable/c/4867687b6ad28ab84bc0811d8f8f9972e769da02 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| www.openwall.com/lists/oss-security/2026/11/06/9 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| git.kernel.org/stable/c/37d5a73170579b30e67cc8b19ec69715eea3a6b6 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/89e534265b62c94749639350200b10370564bb3a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/36f858f228e3f955b9336af7f94634747c221518 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ab9cdf1291be551da999510b30216a2886074d7a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/6cd611d2abdd8623a554e14145f82c1cb4e4467a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/4223b33be49ee09acb6f1d26beb4a36dd3b8d63a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.