CVE-2024-56670

Kernel crash via gadget serial disconnect race

Published Dec 27, 2024 · Updated May 11, 2026

Null pointer dereference in affected Linux kernel versions allows local users to crash the kernel through concurrent USB gadget operations. In drivers/usb/gadget/function/u_serial.c, gs_start_io calls gs_free_requests through port_usb after gserial_disconnect sets that pointer to NULL in a competing thread. Reachability requires local access to open the gadget serial TTY while the USB gadget disconnects, and the resulting impact is a kernel crash.

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 affected Linux kernel versions allows local users to crash the kernel through concurrent USB gadget operations. In drivers/usb/gadget/function/u_serial.c, gs_start_io calls gs_free_requests through port_usb after gserial_disconnect sets that pointer to NULL in a competing thread. Reachability requires local access to open the gadget serial TTY while the USB gadget disconnects, and the resulting impact is a kernel crash.

The record

CVE
CVE-2024-56670
Published
Dec 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 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=2.6.27
  2. Affected versionversion=c1dca562be8ada614ef193aa246c6f8705bcd6b9 <1247e1df086aa6c17ab53cd1bedce70dd7132765
  3. Affected versionversion=c1dca562be8ada614ef193aa246c6f8705bcd6b9 <28b3c03a6790de1f6f2683919ad657840f0f0f58
  4. Affected versionversion=c1dca562be8ada614ef193aa246c6f8705bcd6b9 <4cfbca86f6a8b801f3254e0e3c8f2b1d2d64be2b
  5. Affected versionversion=c1dca562be8ada614ef193aa246c6f8705bcd6b9 <4efdfdc32d8d6307f968cd99f1db64468471bab1
  6. Affected versionversion=c1dca562be8ada614ef193aa246c6f8705bcd6b9 <8ca07a3d18f39b1669927ef536e485787e856df6
  7. Affected versionversion=c1dca562be8ada614ef193aa246c6f8705bcd6b9 <c83213b6649d22656b3a4e92544ceeea8a2c6c07
  8. Affected versionversion=c1dca562be8ada614ef193aa246c6f8705bcd6b9 <dd6b0ca6025f64ccb465a6a3460c5b0307ed9c44

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.27; version=c1dca562be8ada614ef193aa246c6f8705bcd6b9 <1247e1df086aa6c17ab53cd1bedce70dd7132765; version=c1dca562be8ada614ef193aa246c6f8705bcd6b9 <28b3c03a6790de1f6f2683919ad657840f0f0f58; version=c1dca562be8ada614ef193aa246c6f8705bcd6b9 <4cfbca86f6a8b801f3254e0e3c8f2b1d2d64be2b; version=c1dca562be8ada614ef193aa246c6f8705bcd6b9 <4efdfdc32d8d6307f968cd99f1db64468471bab1; version=c1dca562be8ada614ef193aa246c6f8705bcd6b9 <8ca07a3d18f39b1669927ef536e485787e856df6; version=c1dca562be8ada614ef193aa246c6f8705bcd6b9 <c83213b6649d22656b3a4e92544ceeea8a2c6c07; version=c1dca562be8ada614ef193aa246c6f8705bcd6b9 <dd6b0ca6025f64ccb465a6a3460c5b0307ed9c44

Published CVSS scores

5.5NIST NVDCVSS: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

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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

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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