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CVE-2026-100080 (GCVE-0-2026-100080)

Vulnerability from cvelistv5 – Published: 2026-11-06 18:23 – Updated: 2026-11-06 19:08

Title

xen-netback: Fix UAF when reading statistics data

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

Severity

No CVSS data available.

Assigner

Linux CNA

References

9 references

URL	Tags
https://git.kernel.org/stable/c/4223b33be49ee09ac…
https://git.kernel.org/stable/c/ab9cdf1291be551da…
https://git.kernel.org/stable/c/36f858f228e3f955b…
https://git.kernel.org/stable/c/89e534265b62c9474…
https://git.kernel.org/stable/c/6cd611d2abdd8623a…
https://git.kernel.org/stable/c/37d5a73170579b30e…
https://git.kernel.org/stable/c/4867687b6ad28ab84…
http://www.openwall.com/lists/oss-security/2026/11/06/9
http://xenbits.xen.org/xsa/advisory-526.html

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4223b33be49ee09acb6f1d26beb4a36dd3b8d63a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ab9cdf1291be551da999510b30216a2886074d7a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 36f858f228e3f955b9336af7f94634747c221518 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 89e534265b62c94749639350200b10370564bb3a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6cd611d2abdd8623a554e14145f82c1cb4e4467a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 37d5a73170579b30e67cc8b19ec69715eea3a6b6 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4867687b6ad28ab84bc0811d8f8f9972e769da02 (git) Affected: 0 , < 5.10.274 (semver) Affected: 0 , < 5.15.225 (semver) Affected: 0 , < 6.1.192 (semver) Affected: 0 , < 6.6.162 (semver) Affected: 0 , < 6.12.116 (semver) Affected: 0 , < 6.18.62 (semver) Affected: 0 , < 7.3.3 (semver)
Linux	Linux	Unaffected: 5.10.274 , ≤ 5.10.* (semver) Unaffected: 5.15.225 , ≤ 5.15.* (semver) Unaffected: 6.1.192 , ≤ 6.1.* (semver) Unaffected: 6.6.162 , ≤ 6.6.* (semver) Unaffected: 6.12.116 , ≤ 6.12.* (semver) Unaffected: 6.18.62 , ≤ 6.18.* (semver) Unaffected: 7.3.3 , ≤ 7.3.* (semver)

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CERTFR-2026-AVI-1485

Vulnerability from certfr_avis - Published: 2026-11-09 - Updated: 2026-11-09

De multiples vulnérabilités ont été découvertes dans Xen. Elles permettent à un attaquant de provoquer une élévation de privilèges, une atteinte à la confidentialité des données et un déni de service.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

	Vendor	Product	Description
	XEN	Xen	Xen toutes versions sans le dernier correctif de sécurité

References

Title

Publication Time

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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