VulnerabilityPublished 28 May 2026Updated 6 Nov 2026

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

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in fd51e810affa38d735d04261e673b2a5fe9c8665 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:34 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in fd51e810affa38d735d04261e673b2a5fe9c8665, f66c7904fb6f0e420a654bc90909e64a25d00896, e9edf9893cf26d060705c910a9b62d8cc96ed56a +5

Exploitation evidence

Disclosed: evidence found.
CVE published 28 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ c0cfa2d8a788fcf45df5bf4070ab2474c88d543a, < fd51e810affa38d735d04261e673b2a5fe9c8665	Fixed in fd51e810affa38d735d04261e673b2a5fe9c8665
LinuxLinux	Affected ≥ c0cfa2d8a788fcf45df5bf4070ab2474c88d543a, < f66c7904fb6f0e420a654bc90909e64a25d00896	Fixed in f66c7904fb6f0e420a654bc90909e64a25d00896
LinuxLinux	Affected ≥ c0cfa2d8a788fcf45df5bf4070ab2474c88d543a, < e9edf9893cf26d060705c910a9b62d8cc96ed56a	Fixed in e9edf9893cf26d060705c910a9b62d8cc96ed56a
LinuxLinux	Affected ≥ c0cfa2d8a788fcf45df5bf4070ab2474c88d543a, < 29371f3cc83e2a92265b4768014a30b80234112f	Fixed in 29371f3cc83e2a92265b4768014a30b80234112f
LinuxLinux	Affected ≥ c0cfa2d8a788fcf45df5bf4070ab2474c88d543a, < 65c484726e74013a2ec7ba67a34d87760ae8f390	Fixed in 65c484726e74013a2ec7ba67a34d87760ae8f390
LinuxLinux	Affected ≥ c0cfa2d8a788fcf45df5bf4070ab2474c88d543a, < 52bcb57a4e8a0865a76c587c2451906342ae1b2d	Fixed in 52bcb57a4e8a0865a76c587c2451906342ae1b2d

Description

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.

References

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