LiveActive security incident?Get immediate response
CVE Record

CVE-2022-50034: usb: cdns3 fix use-after-free at workaround 2

In the Linux kernel, the following vulnerability has been resolved: usb: cdns3 fix use-after-free at workaround 2 BUG: KFENCE: use-after-free read in __list_del_entry_valid+0x10/0xac cdns3_wa2_remove_old_request() { ... kfree(priv_req->request.buf); cdns3_gadget_ep_free_request(&priv_ep->endpoint, &priv_req->request); list_del_init(&priv_req->list); ^^^ use after free ... } cdns3_gadget_ep_free_request() free the space pointed by priv_req, but priv_req is used in the following list_del_init(). This patch move list_del_init() before cdns3_gadget_ep_free_request().

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2022-50034 is a Linux kernel bug in the Cadence USB3 controller gadget driver. A request object can be freed and then used again, which can cause memory corruption or a kernel crash. Business impact is likely limited to systems using this specific USB controller path, but kernel bugs should be prioritized where affected hardware is present.

Executive priority

Treat as a targeted kernel maintenance priority, not an emergency based on current sources. Patch affected Linux systems where cdns3 USB gadget functionality exists, especially embedded, appliance, or device platforms. Broader server fleets may have low exposure if this driver path is absent.

Technical view

The issue is a use-after-free in the Linux kernel cdns3 USB gadget code. In cdns3_wa2_remove_old_request(), cdns3_gadget_ep_free_request() frees priv_req, then list_del_init() uses priv_req afterward. The fix reorders list_del_init() before freeing the request. Multiple stable kernel commits are referenced as fixes.

Likely exposure

Exposure appears limited to Linux systems running affected kernel versions with the Cadence USB3 cdns3 gadget driver path in use. The CVE record lists fixes across stable branches including 5.4.211, 5.10.138, 5.15.63, 5.19.4, and 6.0. Confirm exact exposure through your distribution kernel advisories.

Exploitation context

The provided sources do not report active exploitation, public exploit code, or CISA KEV listing. The bug was detected as a KFENCE use-after-free read. Practical impact depends on whether an attacker can influence the affected USB gadget request lifecycle on a vulnerable system.

Researcher notes

The evidence is clear on root cause and fix ordering, but incomplete on exploitability, attack prerequisites, and CVSS severity. Validate branch-specific affected ranges through Linux stable or downstream distribution records because vendors often backport fixes without changing major kernel versions.

Mitigation direction

  • Update to a vendor kernel containing the referenced stable fixes.
  • Prioritize systems using Cadence USB3 cdns3 gadget functionality.
  • Check distribution advisories for backported fixes and package names.
  • If no patched package exists, follow vendor guidance for temporary risk reduction.

Validation and detection

  • Inventory Linux kernel versions and branches across affected assets.
  • Determine whether cdns3 USB gadget driver support is enabled or loaded.
  • Review kernel package changelogs for CVE-2022-50034 or referenced fix commits.
  • Confirm updated systems run a kernel at or beyond the fixed branch version.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2022-50034 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
6Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux8bc1901ca7b07d864fca11461b3875b31f949765, 8bc1901ca7b07d864fca11461b3875b31f949765, 8bc1901ca7b07d864fca11461b3875b31f949765, 8bc1901ca7b07d864fca11461b3875b31f949765, 8bc1901ca7b07d864fca11461b3875b31f949765unaffected
LinuxLinux5.3, 0, 5.4.211, 5.10.138, 5.15.63, 5.19.4, 6.0affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.