CVE-2023-52855

Kernel NULL-pointer dereference via unlocked URB reset

Published May 21, 2024 · Updated May 11, 2026

Race condition in the Linux DWC2 USB host controller driver allows attackers to trigger a NULL-pointer dereference during URB handling. The enqueue path clears urb->hcpriv without holding hsotg->lock, so a concurrent dequeue can pass its earlier non-NULL check and then use the cleared pointer. The DWC2 host-controller path and concurrent enqueue and dequeue operations must be present; static analysis found the issue, and no runtime crash was demonstrated on associated hardware.

CVSS severityUnavailable
Unscored
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux DWC2 USB host controller driver allows attackers to trigger a NULL-pointer dereference during URB handling. The enqueue path clears urb->hcpriv without holding hsotg->lock, so a concurrent dequeue can pass its earlier non-NULL check and then use the cleared pointer. The DWC2 host-controller path and concurrent enqueue and dequeue operations must be present; static analysis found the issue, and no runtime crash was demonstrated on associated hardware.

The record

CVE
CVE-2023-52855
Published
May 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. May 21, 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=33ad261aa62be02f0cedeb4d5735cc726de84a3f <14c9ec34e8118fbffd7f5431814d767726323e72
  2. Affected versionversion=33ad261aa62be02f0cedeb4d5735cc726de84a3f <3e851a77a13ce944d703721793f49ee82622986d
  3. Affected versionversion=33ad261aa62be02f0cedeb4d5735cc726de84a3f <64c47749fc7507ed732e155c958253968c1d275e
  4. Affected versionversion=33ad261aa62be02f0cedeb4d5735cc726de84a3f <6b21a22728852d020a6658d39cd7bb7e14b07790
  5. Affected versionversion=33ad261aa62be02f0cedeb4d5735cc726de84a3f <a7bee9598afb38004841a41dd8fe68c1faff4e90
  6. Affected versionversion=33ad261aa62be02f0cedeb4d5735cc726de84a3f <bdb3dd4096302d6b87441fdc528439f171b04be6
  7. Affected versionversion=33ad261aa62be02f0cedeb4d5735cc726de84a3f <ef307bc6ef04e8c1ea843231db58e3afaafa9fa6
  8. Affected versionversion=33ad261aa62be02f0cedeb4d5735cc726de84a3f <fcaafb574fc88a52dce817f039f7ff2f9da38001
  9. Affected versionversion=33ad261aa62be02f0cedeb4d5735cc726de84a3f <fed492aa6493a91a77ebd51da6fb939c98d94a0d
  10. Affected versionversion=4.2

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=33ad261aa62be02f0cedeb4d5735cc726de84a3f <14c9ec34e8118fbffd7f5431814d767726323e72; version=33ad261aa62be02f0cedeb4d5735cc726de84a3f <3e851a77a13ce944d703721793f49ee82622986d; version=33ad261aa62be02f0cedeb4d5735cc726de84a3f <64c47749fc7507ed732e155c958253968c1d275e; version=33ad261aa62be02f0cedeb4d5735cc726de84a3f <6b21a22728852d020a6658d39cd7bb7e14b07790; version=33ad261aa62be02f0cedeb4d5735cc726de84a3f <a7bee9598afb38004841a41dd8fe68c1faff4e90; version=33ad261aa62be02f0cedeb4d5735cc726de84a3f <bdb3dd4096302d6b87441fdc528439f171b04be6; version=33ad261aa62be02f0cedeb4d5735cc726de84a3f <ef307bc6ef04e8c1ea843231db58e3afaafa9fa6; version=33ad261aa62be02f0cedeb4d5735cc726de84a3f <fcaafb574fc88a52dce817f039f7ff2f9da38001; version=33ad261aa62be02f0cedeb4d5735cc726de84a3f <fed492aa6493a91a77ebd51da6fb939c98d94a0d; version=4.2

Published CVSS scores

No CVSS assessment is available in this record.

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
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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