CVE-2026-31552Network attack vector

Remote system hang via infinite wlcore retry loop

Published Apr 24, 2026 · Updated Apr 24, 2026

Denial of service in the Linux Kernel wlcore Wi-Fi driver allows remote attackers to hang affected systems through network traffic. wlcore_tx_work_locked misreads an allocation-related -EAGAIN return as a full aggregation buffer, requeues the same packet, and retries indefinitely while holding wl->mutex. Exploitation requires an operating wlcore-backed Wi-Fi interface and transmit-side allocation pressure; the resulting CPU soft lockup interrupts system availability.

CVSS severity7.5
High
EPSS probability0.50%
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 wlcore Wi-Fi driver allows remote attackers to hang affected systems through network traffic. wlcore_tx_work_locked misreads an allocation-related -EAGAIN return as a full aggregation buffer, requeues the same packet, and retries indefinitely while holding wl->mutex. Exploitation requires an operating wlcore-backed Wi-Fi interface and transmit-side allocation pressure; the resulting CPU soft lockup interrupts system availability.

The record

CVE
CVE-2026-31552
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-835, T1499.004
Attack vector
network
Privileges
unauthenticated

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.19
  2. Affected versionversion=689a7980e4788e13e766763d53569fb78dea2513 <46c670ff1ff466e5eccb3940f726586473dc053c
  3. Affected versionversion=71de0b6e04bbee5575caf9a1e4d424e7dcc50018 <cfa64e2b3717be1da7c4c1aff7268a009e8c1610
  4. Affected versionversion=745a0810dbc96a0471e5f5e627ba1e978c3116d4 <ceb46b40b021d21911ff8608ce4ed33c1264ad2f
  5. Affected versionversion=88295a55fefe5414e64293638b6f7549646e58ed <980f793645540ca7a6318165cc12f49d5febeb99
  6. Affected versionversion=b167312390fdd461c81ead516f2b0b44e83a9edb <a6dc74209462c4fe5a88718d2f3a5286886081c8
  7. Affected versionversion=cd89a4656c03f8db0c57350aaec69cd3cfaa3522 <12f9eef39e49716c763714bfda835a733d5f6dea
  8. Affected versionversion=e75665dd096819b1184087ba5718bd93beafff51 <deb353d9bb009638b7762cae2d0b6e8fdbb41a69
  9. Affected versionversion=e75665dd096819b1184087ba5718bd93beafff51 <f2c06d718a7b85cbc59ceaa2ff3f46b178ac709c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=689a7980e4788e13e766763d53569fb78dea2513 <46c670ff1ff466e5eccb3940f726586473dc053c; version=71de0b6e04bbee5575caf9a1e4d424e7dcc50018 <cfa64e2b3717be1da7c4c1aff7268a009e8c1610; version=745a0810dbc96a0471e5f5e627ba1e978c3116d4 <ceb46b40b021d21911ff8608ce4ed33c1264ad2f; version=88295a55fefe5414e64293638b6f7549646e58ed <980f793645540ca7a6318165cc12f49d5febeb99; version=b167312390fdd461c81ead516f2b0b44e83a9edb <a6dc74209462c4fe5a88718d2f3a5286886081c8; version=cd89a4656c03f8db0c57350aaec69cd3cfaa3522 <12f9eef39e49716c763714bfda835a733d5f6dea; version=e75665dd096819b1184087ba5718bd93beafff51 <deb353d9bb009638b7762cae2d0b6e8fdbb41a69; version=e75665dd096819b1184087ba5718bd93beafff51 <f2c06d718a7b85cbc59ceaa2ff3f46b178ac709c

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
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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