CVE-2026-31550

System hang via insufficient ASB polling timeout

Published Apr 24, 2026 · Updated Apr 24, 2026

Denial of service in the Linux kernel on BCM2711 systems allows local users to cause hangs during V3D runtime suspend. bcm2835_asb_control() polls V3D's master ASB for only one microsecond and treats a delayed acknowledgement as failure, leaving V3D powered incorrectly. Intensive workloads must delay the handshake, after which later V3D accesses produce bus faults or hang the system.

CVSS severity5.5
Medium
EPSS probability0.12%
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 on BCM2711 systems allows local users to cause hangs during V3D runtime suspend. bcm2835_asb_control() polls V3D's master ASB for only one microsecond and treats a delayed acknowledgement as failure, leaving V3D powered incorrectly. Intensive workloads must delay the handshake, after which later V3D accesses produce bus faults or hang the system.

The record

CVE
CVE-2026-31550
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 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=5.1
  2. Affected versionversion=670c672608a1ffcbc7ac0f872734843593bb8b15 <0e84e74849d2d7e9b23a09c2d5e0d9357db1ca59
  3. Affected versionversion=670c672608a1ffcbc7ac0f872734843593bb8b15 <18605b1b936b66b1f34dcf8e9ad4f1fbcf7a7c13
  4. Affected versionversion=670c672608a1ffcbc7ac0f872734843593bb8b15 <572f17180f26619809b8e0593d926762aa8660ff
  5. Affected versionversion=670c672608a1ffcbc7ac0f872734843593bb8b15 <622ab02e955c35c125ff2b65d8327b2c52db8758
  6. Affected versionversion=670c672608a1ffcbc7ac0f872734843593bb8b15 <9443202d91388026dbf7312972a74fbfd27ee82f
  7. Affected versionversion=670c672608a1ffcbc7ac0f872734843593bb8b15 <b826d2c0b0ecb844c84431ba6b502e744f5d919a
  8. Affected versionversion=670c672608a1ffcbc7ac0f872734843593bb8b15 <c5e734f6a0740dce92e7c919e632cb43fa5d4e53
  9. Affected versionversion=670c672608a1ffcbc7ac0f872734843593bb8b15 <ea4fa54b83bb2e4a21e9026824bfe271b1a6ee1e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.1; version=670c672608a1ffcbc7ac0f872734843593bb8b15 <0e84e74849d2d7e9b23a09c2d5e0d9357db1ca59; version=670c672608a1ffcbc7ac0f872734843593bb8b15 <18605b1b936b66b1f34dcf8e9ad4f1fbcf7a7c13; version=670c672608a1ffcbc7ac0f872734843593bb8b15 <572f17180f26619809b8e0593d926762aa8660ff; version=670c672608a1ffcbc7ac0f872734843593bb8b15 <622ab02e955c35c125ff2b65d8327b2c52db8758; version=670c672608a1ffcbc7ac0f872734843593bb8b15 <9443202d91388026dbf7312972a74fbfd27ee82f; version=670c672608a1ffcbc7ac0f872734843593bb8b15 <b826d2c0b0ecb844c84431ba6b502e744f5d919a; version=670c672608a1ffcbc7ac0f872734843593bb8b15 <c5e734f6a0740dce92e7c919e632cb43fa5d4e53; version=670c672608a1ffcbc7ac0f872734843593bb8b15 <ea4fa54b83bb2e4a21e9026824bfe271b1a6ee1e

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5OracleCVSS: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

T1499.004Application 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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