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NVD / CVE Program· CNA Linux

CVE-2026-46214: vsock/virtio: fix accept queue count leak on transport mismatch

MediumCVSS 5.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.13% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 29371f3cc83e2a92265b4768014a30b80234112f, 2ea5d2c79edcc99c7dbe0bb7518f5e1ee2a2391f, 52bcb57a4e8a0865a76c587c2451906342ae1b2d; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 29371f3cc83e2a92265b4768014a30b80234112f, 2ea5d2c79edcc99c7dbe0bb7518f5e1ee2a2391f, 52bcb57a4e8a0865a76c587c2451906342ae1b2d; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1 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: vsock/virtio: fix accept queue count leak on transport mismatch virtio_transport_recv_listen() calls sk_acceptq_added() before vsock_assign_transport(). If vsock_assign_transport() fails or selects a different transport, the error path returns without calling sk_acceptq_removed(), permanently incrementing sk_ack_backlog. After approximately backlog+1 such failures, sk_acceptq_is_full() returns true, causing the listener to reject all new connections. Fix by moving sk_acceptq_added() to after the transport validation, matching the pattern used by vmci_transport and hyperv_transport.

Published
May 28, 2026
Updated
Nov 6, 2026
EPSS
0.1% · 2th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-46214

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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.

VendorProduct
linuxlinux kernel

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

    • 5.5affected
    • c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and later · before 2ea5d2c79edcc99c7dbe0bb7518f5e1ee2a2391faffected · git
    • c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and later · before fd51e810affa38d735d04261e673b2a5fe9c8665affected · git
    • c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and later · before f66c7904fb6f0e420a654bc90909e64a25d00896affected · git
    • c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and later · before 65c484726e74013a2ec7ba67a34d87760ae8f390affected · git
    • c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and later · before 29371f3cc83e2a92265b4768014a30b80234112faffected · git
    • c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and later · before e9edf9893cf26d060705c910a9b62d8cc96ed56aaffected · git
    • c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and later · before 6d3275fc4ed968938e1d556c344798046776668daffected · git
    • c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and later · before 52bcb57a4e8a0865a76c587c2451906342ae1b2daffected · git
    • before 5.5not affected · semver
Affected versions · NVD (7)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.5 and later · before 5.10.258
  • linux linux kernel5.11 and later · before 5.15.209
  • linux linux kernel5.16 and later · before 6.1.175
  • linux linux kernel6.2 and later · before 6.6.140
  • linux linux kernel6.7 and later · before 6.12.90
  • linux linux kernel6.13 and later · before 6.18.32
  • linux linux kernel6.19 and later · before 7.0.9

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.90-16.12.90-1
Debian:14linuxbefore 7.0.9-17.0.9-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-46209May 28, 2026 · drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs()
    31Monitor
  • ← EarlierCVE-2026-46210May 28, 2026 · media: iris: fix use-after-free of fmt_src during MBPF check
    31Monitor
  • Later →CVE-2026-46216May 28, 2026 · drm/xe/hdcp: Add NULL check for media_gt in intel_hdcp_gsc_check_status()
    22Monitor

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 Linux29371f3cc83e2a92265b4768014a30b80234112fVendor (CNA)
Linux Linux2ea5d2c79edcc99c7dbe0bb7518f5e1ee2a2391fVendor (CNA)
Linux Linux52bcb57a4e8a0865a76c587c2451906342ae1b2dVendor (CNA)
Linux Linux65c484726e74013a2ec7ba67a34d87760ae8f390Vendor (CNA)
Linux Linux6d3275fc4ed968938e1d556c344798046776668dVendor (CNA)
Linux Linuxe9edf9893cf26d060705c910a9b62d8cc96ed56aVendor (CNA)
Linux Linuxf66c7904fb6f0e420a654bc90909e64a25d00896Vendor (CNA)
Linux Linuxfd51e810affa38d735d04261e673b2a5fe9c8665Vendor (CNA)
azl3 kernel 6.6.139.1-1 on Azure Linux 3.06.6.141.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.176-1 · Debian:12Package 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.

No dated events beyond publication.

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

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.

References

Show all references (8 more)

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

All records