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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-99286: xen-netback: Fix XenBus connection failure cleanup

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Fixed version: Linux Linux 07aca7d25ce8578fedde49855983a01c537a782b, 6.12.117, 6.18.63.

Low priority for now. Upgrade to Linux Linux 07aca7d25ce8578fedde49855983a01c537a782b, 6.12.117, 6.18.63 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org

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

—No exploit Fix available
Published
Nov 10, 2026
Updated
Nov 10, 2026
EPSS
—
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · —

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Noroxi analysis

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before ade3082dcdee17c5767069883936d64ff83f6c9faffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before a97aa838903d15f865d80809f5198ff459c6634aaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 07aca7d25ce8578fedde49855983a01c537a782baffected · git
    • before 6.12.117affected · semver
    • before 6.18.63affected · semver
    • before 7.3.4affected · semver
    • 6.12.117 and later · up to and including 6.12.*not affected · semver
    • 6.18.63 and later · up to and including 6.18.*not affected · semver
    • 7.3.4 and later · up to and including 7.3.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-99284Nov 7, 2026 · net: skbuff: propagate shared-frag marker in skb_zerocopy()
    0Monitor
  • ← EarlierCVE-2026-99285Nov 10, 2026 · netfilter: nft_byteorder: remove multi-register support
    0Monitor
  • Later →CVE-2026-99287Nov 10, 2026 · xen-netback: Zero out sring pointers on unmap
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux07aca7d25ce8578fedde49855983a01c537a782bVendor (CNA)
Linux Linux6.12.117Vendor (CNA)
Linux Linux6.18.63Vendor (CNA)
Linux Linux7.3.4Vendor (CNA)
Linux Linuxa97aa838903d15f865d80809f5198ff459c6634aVendor (CNA)
Linux Linuxade3082dcdee17c5767069883936d64ff83f6c9fVendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 11, 2026+1 d

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Exploit maturity— → none
  2. Fix✗ → ✓

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References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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