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  4. CVE 2026 99286 xen netback fix xenbus connection failure cleanup
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Back to active CVEs
Unknown severity ยท Source severity not reportedCVE-2026-99286

xen-netback: Fix XenBus connection failure cleanupCVE-2026-99286

Answer in brief

CVE-2026-99286 records a Unknown severity vulnerability in xen-netback: Fix XenBus connection failure cleanup. 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.

Published Nov 10, 2026Updated Nov 10, 2026Source checked Nov 10, 2026First seen by HOL Nov 10, 2026Material review Nov 10, 2026
Upstream Advisory

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

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.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ade3082dcdee17c5767069883936d64ff83f6c9f || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a97aa838903d15f865d80809f5198ff459c6634a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <07aca7d25ce8578fedde49855983a01c537a782b || >=0 <6.12.117 || >=0 <6.18.63 || >=0 <7.3.4ade3082dcdee17c5767069883936d64ff83f6c9f, a97aa838903d15f865d80809f5198ff459c6634a, 07aca7d25ce8578fedde49855983a01c537a782b, 6.12.117, 6.18.63, 7.3.4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to ade3082dcdee17c5767069883936d64ff83f6c9f if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 10, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: xen-netback: Fix XenBus connection failure cleanup xenvif_get_stats and xenvif_get_ethtool_stats capture vif->num_queues under rcu_read_lock. We need to unpublish vif->num_queues before synchronize_net to ensure that readers that come afterwards will not read a non-zero vif->num_queues and attempt to access invalid queues. This is the same cleanup algorithm as used in backend_disconnect and added in commit b17075d5c198 ("xen-netback: fix race condition on XenBus disconnect"). This is XSA-531

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • netfilter: nft_byteorder: remove multi-register supportSame linux/linux package
  • xen-netback: Zero out sring pointers on unmapSame linux/linux package
  • inet: reject unhashed sockets during established lookupsSame linux/linux package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Nov 10, 2026
References
3 linked sources
Open source record