CVE-2024-56700

Kernel crash via wl128x response-buffer race

Published Dec 28, 2024 · Updated May 11, 2026

NULL pointer dereference in Linux allows local users to crash affected systems through concurrent wl128x FM command handling. The fmc_send_cmd() path checks fmdev->resp_skb before taking the lock, so a concurrent path can clear the pointer after validation and evt_hdr then dereferences skb->data. Reachability requires local low-privileged access and an active wl128x FM device, and the documented consequence is a kernel crash without data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux allows local users to crash affected systems through concurrent wl128x FM command handling. The fmc_send_cmd() path checks fmdev->resp_skb before taking the lock, so a concurrent path can clear the pointer after validation and evt_hdr then dereferences skb->data. Reachability requires local low-privileged access and an active wl128x FM device, and the documented consequence is a kernel crash without data disclosure or modification.

The record

CVE
CVE-2024-56700
Published
Dec 28, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 28, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=2.6.39
  2. Affected versionversion=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <2e63c908de357048180516b84740ed62dac0b269
  3. Affected versionversion=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <372dc9509122e5d45d4c12978e31c3c7d00aaca4
  4. Affected versionversion=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <378ce4e08ca2b1ac7bbf1d57b68643ca4226c5f8
  5. Affected versionversion=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <3c818ad07e964bca3d27adac1e1f50e1e3c9180e
  6. Affected versionversion=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <80a3b2ee01eecf22dfa06968b3cde92c691dea10
  7. Affected versionversion=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <ca59f9956d4519ab18ab2270be47c6b8c6ced091
  8. Affected versionversion=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <d16109c9fdc1b8cea4fe63b42e06e926c3f68990
  9. Affected versionversion=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <d7408a052aa1b4f6fb6f1c7a8877b84017a07ac9
  10. Affected versionversion=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <ed228b74d8a500380150965d5becabf9a1e33141

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.39; version=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <2e63c908de357048180516b84740ed62dac0b269; version=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <372dc9509122e5d45d4c12978e31c3c7d00aaca4; version=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <378ce4e08ca2b1ac7bbf1d57b68643ca4226c5f8; version=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <3c818ad07e964bca3d27adac1e1f50e1e3c9180e; version=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <80a3b2ee01eecf22dfa06968b3cde92c691dea10; version=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <ca59f9956d4519ab18ab2270be47c6b8c6ced091; version=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <d16109c9fdc1b8cea4fe63b42e06e926c3f68990; version=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <d7408a052aa1b4f6fb6f1c7a8877b84017a07ac9; version=e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 <ed228b74d8a500380150965d5becabf9a1e33141

Published CVSS scores

5.5UbuntuCVSS: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-476NULL Pointer Dereference
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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