CVE-2026-74614

System instability via stale virtqueue pointer

Published Aug 22, 2026 · Updated Aug 25, 2026

Missing synchronization in the Linux virtio-vsock transport allows local users to destabilize the system during device suspend and restore. The RX, TX, and event workers read a virtqueue pointer before taking its mutex and checking its run flag, allowing a delayed worker to retain a deleted queue while observing the replacement queue as running. The race requires a worker to span device freeze and restore; the stale pointer can cause system instability or denial of service.

CVSS severity8.4
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

Missing synchronization in the Linux virtio-vsock transport allows local users to destabilize the system during device suspend and restore. The RX, TX, and event workers read a virtqueue pointer before taking its mutex and checking its run flag, allowing a delayed worker to retain a deleted queue while observing the replacement queue as running. The race requires a worker to span device freeze and restore; the stale pointer can cause system instability or denial of service.

The record

CVE
CVE-2026-74614
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-820, T1499
Attack vector
local
Privileges
unauthenticated

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=5.15.138 <5.15.216
  2. Affected versionversion=5.19
  3. Affected versionversion=762c251c7f5c4ee5bef71460c6e822ed293fd69f <941329ce14c5f481223a10d1d4c8b57ea7f3048a
  4. Affected versionversion=bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c <1cecb4202afdbeddcf29d59baf596ac6ab753f7f
  5. Affected versionversion=bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c <29dd10583bf9d2744cd84b862e4257c0a5699570
  6. Affected versionversion=bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c <a1fb0c5b8a7c2753758aeced40971f99449dde0c
  7. Affected versionversion=bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c <bd43a7ec668be428265b3209eb43647aedcf720a
  8. Affected versionversion=bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c <eae099c764c7ebdb842eb1f638913e310bdd6513
  9. Affected versionversion=bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c <ebac8f6b1ef0e9278afe204b8692a7479988dace

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15.138 <5.15.216; version=5.19; version=762c251c7f5c4ee5bef71460c6e822ed293fd69f <941329ce14c5f481223a10d1d4c8b57ea7f3048a; version=bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c <1cecb4202afdbeddcf29d59baf596ac6ab753f7f; version=bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c <29dd10583bf9d2744cd84b862e4257c0a5699570; version=bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c <a1fb0c5b8a7c2753758aeced40971f99449dde0c; version=bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c <bd43a7ec668be428265b3209eb43647aedcf720a; version=bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c <eae099c764c7ebdb842eb1f638913e310bdd6513; version=bd50c5dc182b0a52599f87b429f9a5a9cbfc9b1c <ebac8f6b1ef0e9278afe204b8692a7479988dace

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
8.4Linux kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/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-820Missing Synchronization
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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