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

CVE-2026-100080: xen-netback: Fix UAF when reading statistics data

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.
  • Probability of exploitation in the next 30 days: 0.26% (FIRST EPSS).
  • Fixed version: Linux Linux 36f858f228e3f955b9336af7f94634747c221518, 37d5a73170579b30e67cc8b19ec69715eea3a6b6, 4223b33be49ee09acb6f1d26beb4a36dd3b8d63a.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 36f858f228e3f955b9336af7f94634747c221518, 37d5a73170579b30e67cc8b19ec69715eea3a6b6, 4223b33be49ee09acb6f1d26beb4a36dd3b8d63a 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 · FIRST EPSS

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

—No exploit Fix available
Published
Nov 6, 2026
Updated
Nov 6, 2026
EPSS
0.2% · 18th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

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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 4223b33be49ee09acb6f1d26beb4a36dd3b8d63aaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before ab9cdf1291be551da999510b30216a2886074d7aaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 36f858f228e3f955b9336af7f94634747c221518affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 89e534265b62c94749639350200b10370564bb3aaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 6cd611d2abdd8623a554e14145f82c1cb4e4467aaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 37d5a73170579b30e67cc8b19ec69715eea3a6b6affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 4867687b6ad28ab84bc0811d8f8f9972e769da02affected · git
    • before 5.10.274affected · semver
    • before 5.15.225affected · semver
    • before 6.1.192affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.116-16.12.116-1

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-2026-99269Nov 3, 2026 · sched_ext: Wait for SCX_OPSS_DISPATCHING before moving tasks off DSQs
    31Monitor
  • ← EarlierCVE-2026-99270Nov 3, 2026 · tcp: Fix potential UAF in reqsk_timer_handler().
    32Monitor
  • Later →CVE-2026-100081Nov 6, 2026 · xen-netback: defer xenvif_mcast_addr_list_free()
    31Monitor

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 Linux36f858f228e3f955b9336af7f94634747c221518Vendor (CNA)
Linux Linux37d5a73170579b30e67cc8b19ec69715eea3a6b6Vendor (CNA)
Linux Linux4223b33be49ee09acb6f1d26beb4a36dd3b8d63aVendor (CNA)
Linux Linux4867687b6ad28ab84bc0811d8f8f9972e769da02Vendor (CNA)
Linux Linux5.10.274Vendor (CNA)
Linux Linux5.15.225Vendor (CNA)
Linux Linux6.1.192Vendor (CNA)
Linux Linux6.12.116Vendor (CNA)
Linux Linux6.18.62Vendor (CNA)
Linux Linux6.6.162Vendor (CNA)
Linux Linux6cd611d2abdd8623a554e14145f82c1cb4e4467aVendor (CNA)
Linux Linux7.3.3Vendor (CNA)
Linux Linux89e534265b62c94749639350200b10370564bb3aVendor (CNA)
Linux Linuxab9cdf1291be551da999510b30216a2886074d7aVendor (CNA)
debian:linux6.12.116-1 · Debian:13Package registry (OSV)

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+5 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.

—

Bug bounty scope

No known public program.

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

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (8 more)

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

All records