CVE-2026-74613

Guest kernel crash via post-teardown RX refill

Published Aug 22, 2026 · Updated Aug 25, 2026

Use-after-free in the Linux kernel vsock/virtio component allows local users to crash a guest during RX queue teardown. The RX worker follows its normal exit path after rx_run is cleared and calls virtio_vsock_rx_fill after virtio_vsock_vqs_del has deleted the virtqueues. An unprivileged guest user must maintain active AF_VSOCK traffic while host-driven suspend, migration, or device removal tears down the queues; the demonstrated consequence is a kernel panic.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel vsock/virtio component allows local users to crash a guest during RX queue teardown. The RX worker follows its normal exit path after rx_run is cleared and calls virtio_vsock_rx_fill after virtio_vsock_vqs_del has deleted the virtqueues. An unprivileged guest user must maintain active AF_VSOCK traffic while host-driven suspend, migration, or device removal tears down the queues; the demonstrated consequence is a kernel panic.

The record

CVE
CVE-2026-74613
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 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=5.3
  2. Affected versionversion=b917507e5ad983085d29069369778b16aa03a0a8 <1aa21e7c8702a7c37cd7d3cace1a652cfa5e8171
  3. Affected versionversion=b917507e5ad983085d29069369778b16aa03a0a8 <38c7763fdc533edb34dc8f4489c260e8ba2ccae9
  4. Affected versionversion=b917507e5ad983085d29069369778b16aa03a0a8 <4d37e3525cc346a1421c1bdeaad5848e249fc60c
  5. Affected versionversion=b917507e5ad983085d29069369778b16aa03a0a8 <9d80a04129a6c27a690cb69de3fe3f50be5aa8b9
  6. Affected versionversion=b917507e5ad983085d29069369778b16aa03a0a8 <a309b74e3fc052352ab778500449cb9c3853c363
  7. Affected versionversion=b917507e5ad983085d29069369778b16aa03a0a8 <a31e0ad444698d8aa7534a0f89fda543730f97a5
  8. Affected versionversion=b917507e5ad983085d29069369778b16aa03a0a8 <a7658508f5fe8f1077a65e8cb9535d3426f37a2f
  9. Affected versionversion=b917507e5ad983085d29069369778b16aa03a0a8 <e82a5faea2e3886dfb2a65ce092a132e7e896915

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.3; version=b917507e5ad983085d29069369778b16aa03a0a8 <1aa21e7c8702a7c37cd7d3cace1a652cfa5e8171; version=b917507e5ad983085d29069369778b16aa03a0a8 <38c7763fdc533edb34dc8f4489c260e8ba2ccae9; version=b917507e5ad983085d29069369778b16aa03a0a8 <4d37e3525cc346a1421c1bdeaad5848e249fc60c; version=b917507e5ad983085d29069369778b16aa03a0a8 <9d80a04129a6c27a690cb69de3fe3f50be5aa8b9; version=b917507e5ad983085d29069369778b16aa03a0a8 <a309b74e3fc052352ab778500449cb9c3853c363; version=b917507e5ad983085d29069369778b16aa03a0a8 <a31e0ad444698d8aa7534a0f89fda543730f97a5; version=b917507e5ad983085d29069369778b16aa03a0a8 <a7658508f5fe8f1077a65e8cb9535d3426f37a2f; version=b917507e5ad983085d29069369778b16aa03a0a8 <e82a5faea2e3886dfb2a65ce092a132e7e896915

Published CVSS scores

7.8Linux CVE teamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
CWE-416Use After Free
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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