5.5

CVE-2023-52855: usb: dwc2: fix possible NULL pointer dereference caused by driver concurrency

Analyzed
AliasesUBUNTU-CVE-2023-52855DEBIAN-CVE-2023-52855
Published 21-05-2024Last modified 11-05-2026

Vulnerability summary

CVE-2023-52855 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 15.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 13 · Related 13
SUSE-SU-2024:2008-1SUSE-SU-2024:2011-1SUSE-SU-2024:2019-1SUSE-SU-2024:2189-1SUSE-SU-2024:2190-1SUSE-SU-2024:2360-1

Timeline

  1. 21-05-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.24% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu116 products
  • linuxAll versions (No fix recorded) | < 5.4.0-173.191 | < 5.15.0-100.110
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1120.130 | < 5.15.0-1056.61
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 33ad261aa62be02f0cedeb4d5735cc726de84a3f, < 14c9ec34e8118fbffd7f5431814d767726323e72 | ≥ 33ad261aa62be02f0cedeb4d5735cc726de84a3f, < fed492aa6493a91a77ebd51da6fb939c98d94a0d | ≥ 33ad261aa62be02f0cedeb4d5735cc726de84a3f, < 64c47749fc7507ed732e155c958253968c1d275e | ≥ 33ad261aa62be02f0cedeb4d5735cc726de84a3f, < bdb3dd4096302d6b87441fdc528439f171b04be6 | ≥ 33ad261aa62be02f0cedeb4d5735cc726de84a3f, < fcaafb574fc88a52dce817f039f7ff2f9da38001 | ≥ 33ad261aa62be02f0cedeb4d5735cc726de84a3f, < 6b21a22728852d020a6658d39cd7bb7e14b07790 | ≥ 33ad261aa62be02f0cedeb4d5735cc726de84a3f, < 3e851a77a13ce944d703721793f49ee82622986d | ≥ 33ad261aa62be02f0cedeb4d5735cc726de84a3f, < a7bee9598afb38004841a41dd8fe68c1faff4e90 | ≥ 33ad261aa62be02f0cedeb4d5735cc726de84a3f, < ef307bc6ef04e8c1ea843231db58e3afaafa9fa6 | 4.2
  • linux_kernel≥ 4.2, < 4.14.330 | ≥ 4.15, < 4.19.299 | ≥ 4.20, < 5.4.261 | ≥ 5.5, < 5.10.201 | ≥ 5.11, < 5.15.139 | ≥ 5.16, < 6.1.63 | ≥ 6.2, < 6.5.12 | ≥ 6.6, < 6.6.2
Debian1 product
  • linux< 6.1.64-1 | < 6.6.8-1

3 vendors · 119 products

References

13 links
Show all 13 references