CVE-2026-53132

Host service interruption via unaccounted skb metadata

Published Jun 25, 2026 · Updated Jun 25, 2026

Denial of service in the Linux kernel vsock/virtio receive path allows guest OS users to exhaust host kernel memory via crafted packets. virtio_transport_inc_rx_pkt() accounts only payload length while virtio_transport_recv_enqueue() retains zero-length EOM packets as separate skbs, so metadata accumulates while rx_bytes remains zero. A malicious KVM guest or local vsock peer that can reach a host endpoint can drive out-of-memory handling and host-wide service loss; confidentiality and integrity are unaffected.

CVSS severity7.1
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel vsock/virtio receive path allows guest OS users to exhaust host kernel memory via crafted packets. virtio_transport_inc_rx_pkt() accounts only payload length while virtio_transport_recv_enqueue() retains zero-length EOM packets as separate skbs, so metadata accumulates while rx_bytes remains zero. A malicious KVM guest or local vsock peer that can reach a host endpoint can drive out-of-memory handling and host-wide service loss; confidentiality and integrity are unaffected.

The record

CVE
CVE-2026-53132
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=077706165717686a2a6a71405fef036cd5b37ae0 <059b7dbd20a6f0c539a45ddff1573cb8946685b5
  2. Affected versionversion=077706165717686a2a6a71405fef036cd5b37ae0 <100d5b2ffdc6468b9e48532641f29e83efdcb63c
  3. Affected versionversion=077706165717686a2a6a71405fef036cd5b37ae0 <1eca304f97a34ed5e921e1f0e06c8b241f25bf12
  4. Affected versionversion=077706165717686a2a6a71405fef036cd5b37ae0 <9bdc637fde66b63d6cad0caacd034888bb7bf5f5
  5. Affected versionversion=5852a2b573f7a3a29df46296e56aa3491e589cdf
  6. Affected versionversion=6.1.63 <6.2
  7. Affected versionversion=6.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=077706165717686a2a6a71405fef036cd5b37ae0 <059b7dbd20a6f0c539a45ddff1573cb8946685b5; version=077706165717686a2a6a71405fef036cd5b37ae0 <100d5b2ffdc6468b9e48532641f29e83efdcb63c; version=077706165717686a2a6a71405fef036cd5b37ae0 <1eca304f97a34ed5e921e1f0e06c8b241f25bf12; version=077706165717686a2a6a71405fef036cd5b37ae0 <9bdc637fde66b63d6cad0caacd034888bb7bf5f5; version=5852a2b573f7a3a29df46296e56aa3491e589cdf; version=6.1.63 <6.2; version=6.3

Published CVSS scores

7.1kernel.orgCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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