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CVE-2023-52855· NVD / CVE Program· CNA Linux

usb: dwc2: fix possible NULL pointer dereference caused by driver concurrency

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.24% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 14c9ec34e8118fbffd7f5431814d767726323e72, 3e851a77a13ce944d703721793f49ee82622986d, 64c47749fc7507ed732e155c958253968c1d275e.

Low priority for now. Upgrade to Linux Linux 14c9ec34e8118fbffd7f5431814d767726323e72, 3e851a77a13ce944d703721793f49ee82622986d, 64c47749fc7507ed732e155c958253968c1d275e or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: usb: dwc2: fix possible NULL pointer dereference caused by driver concurrency In _dwc2_hcd_urb_enqueue(), "urb->hcpriv = NULL" is executed without holding the lock "hsotg->lock". In _dwc2_hcd_urb_dequeue(): spin_lock_irqsave(&hsotg->lock, flags); ... if (!urb->hcpriv) { dev_dbg(hsotg->dev, "## urb->hcpriv is NULL ##\n"); goto out; } rc = dwc2_hcd_urb_dequeue(hsotg, urb->hcpriv); // Use urb->hcpriv ... out: spin_unlock_irqrestore(&hsotg->lock, flags); When _dwc2_hcd_urb_enqueue() and _dwc2_hcd_urb_dequeue() are concurrently executed, the NULL check of "urb->hcpriv" can be executed before "urb->hcpriv = NULL". After urb->hcpriv is NULL, it can be used in the function call to dwc2_hcd_urb_dequeue(), which can cause a NULL pointer dereference. This possible bug is found by an experimental static analysis tool developed by myself. This tool analyzes the locking APIs to extract function pairs that can be concurrently executed, and then analyzes the instructions in the paired functions to identify possible concurrency bugs including data races and atomicity violations. The above possible bug is reported, when my tool analyzes the source code of Linux 6.5. To fix this possible bug, "urb->hcpriv = NULL" should be executed with holding the lock "hsotg->lock". After using this patch, my tool never reports the possible bug, with the kernelconfiguration allyesconfig for x86_64. Because I have no associated hardware, I cannot test the patch in runtime testing, and just verify it according to the code logic.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 21, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 14th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel4.2 and later · before 4.14.330
  • linux linux kernel4.15 and later · before 4.19.299
  • linux linux kernel4.20 and later · before 5.4.261
  • linux linux kernel5.5 and later · before 5.10.201
  • linux linux kernel5.11 and later · before 5.15.139
  • linux linux kernel5.16 and later · before 6.1.63
  • linux linux kernel6.2 and later · before 6.5.12
  • linux linux kernel6.6 and later · before 6.6.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.2affected
    • 33ad261aa62be02f0cedeb4d5735cc726de84a3f and later · before 14c9ec34e8118fbffd7f5431814d767726323e72affected · git
    • 33ad261aa62be02f0cedeb4d5735cc726de84a3f and later · before fed492aa6493a91a77ebd51da6fb939c98d94a0daffected · git
    • 33ad261aa62be02f0cedeb4d5735cc726de84a3f and later · before 64c47749fc7507ed732e155c958253968c1d275eaffected · git
    • 33ad261aa62be02f0cedeb4d5735cc726de84a3f and later · before bdb3dd4096302d6b87441fdc528439f171b04be6affected · git
    • 33ad261aa62be02f0cedeb4d5735cc726de84a3f and later · before fcaafb574fc88a52dce817f039f7ff2f9da38001affected · git
    • 33ad261aa62be02f0cedeb4d5735cc726de84a3f and later · before 6b21a22728852d020a6658d39cd7bb7e14b07790affected · git
    • 33ad261aa62be02f0cedeb4d5735cc726de84a3f and later · before 3e851a77a13ce944d703721793f49ee82622986daffected · git
    • 33ad261aa62be02f0cedeb4d5735cc726de84a3f and later · before a7bee9598afb38004841a41dd8fe68c1faff4e90affected · git
    • 33ad261aa62be02f0cedeb4d5735cc726de84a3f and later · before ef307bc6ef04e8c1ea843231db58e3afaafa9fa6affected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.64-16.1.64-1
Debian:13linuxbefore 6.6.8-16.6.8-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2023-52853May 21, 2024 · hid: cp2112: Fix duplicate workqueue initialization
    22Monitor
  • ← EarlierCVE-2023-52854May 21, 2024 · padata: Fix refcnt handling in padata_free_shell()
    31Monitor
  • Later →CVE-2023-52856May 21, 2024 · drm/bridge: lt8912b: Fix crash on bridge detach
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux14c9ec34e8118fbffd7f5431814d767726323e72Vendor (CNA)
Linux Linux3e851a77a13ce944d703721793f49ee82622986dVendor (CNA)
Linux Linux64c47749fc7507ed732e155c958253968c1d275eVendor (CNA)
Linux Linux6b21a22728852d020a6658d39cd7bb7e14b07790Vendor (CNA)
Linux Linuxa7bee9598afb38004841a41dd8fe68c1faff4e90Vendor (CNA)
Linux Linuxbdb3dd4096302d6b87441fdc528439f171b04be6Vendor (CNA)
Linux Linuxef307bc6ef04e8c1ea843231db58e3afaafa9fa6Vendor (CNA)
Linux Linuxfcaafb574fc88a52dce817f039f7ff2f9da38001Vendor (CNA)
Linux Linuxfed492aa6493a91a77ebd51da6fb939c98d94a0dVendor (CNA)
debian:linux6.1.64-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records