LiveActive security incident?Get immediate response
CVE Record

CVE-2024-26749: usb: cdns3: fixed memory use after free at cdns3_gadget_ep_disable()

In the Linux kernel, the following vulnerability has been resolved: usb: cdns3: fixed memory use after free at cdns3_gadget_ep_disable() ... cdns3_gadget_ep_free_request(&priv_ep->endpoint, &priv_req->request); list_del_init(&priv_req->list); ... 'priv_req' actually free at cdns3_gadget_ep_free_request(). But list_del_init() use priv_req->list after it. [ 1542.642868][ T534] BUG: KFENCE: use-after-free read in __list_del_entry_valid+0x10/0xd4 [ 1542.642868][ T534] [ 1542.653162][ T534] Use-after-free read at 0x000000009ed0ba99 (in kfence-#3): [ 1542.660311][ T534] __list_del_entry_valid+0x10/0xd4 [ 1542.665375][ T534] cdns3_gadget_ep_disable+0x1f8/0x388 [cdns3] [ 1542.671571][ T534] usb_ep_disable+0x44/0xe4 [ 1542.675948][ T534] ffs_func_eps_disable+0x64/0xc8 [ 1542.680839][ T534] ffs_func_set_alt+0x74/0x368 [ 1542.685478][ T534] ffs_func_disable+0x18/0x28 Move list_del_init() before cdns3_gadget_ep_free_request() to resolve this problem.

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

Security readout for executives and security teams

Plain-English summary

CVE-2024-26749 is a Linux kernel bug in the Cadence CDNS3 USB gadget driver. When a USB gadget endpoint is disabled, the driver can touch request memory after it has already been freed. The public record describes a kernel memory-safety flaw, not a broadly confirmed remote compromise issue.

Executive priority

Treat this as a targeted kernel maintenance issue. It deserves timely patching for embedded, appliance, and USB device-mode fleets, but the supplied evidence does not support emergency prioritization for all Linux systems or claims of active exploitation.

Technical view

The bug is a use-after-free in cdns3_gadget_ep_disable(). The vulnerable flow frees priv_req through cdns3_gadget_ep_free_request(), then calls list_del_init() on priv_req->list. The upstream fix moves list_del_init() before the free. Evidence includes KFENCE reporting a use-after-free read in __list_del_entry_valid via cdns3_gadget_ep_disable().

Likely exposure

Most relevant to Linux systems using the cdns3 USB gadget driver, commonly hardware-dependent embedded or device-mode USB deployments. General servers are only likely exposed if this driver and USB gadget functionality are present and reachable. The supplied sources do not identify specific products beyond Linux kernel versions and stable fixes.

Exploitation context

The source bundle does not report active exploitation, and KEV status is false. The public evidence shows a reproducible memory-safety bug detected by KFENCE during USB gadget endpoint disable handling. No exploit path, privilege requirement, or remote attack scenario is established in the supplied sources.

Researcher notes

The key detail is operation ordering: list removal must occur before freeing the request object. The record names multiple Linux stable commits and a Debian LTS advisory, but does not provide CVSS, CWE, exploitability assessment, or affected downstream product mapping.

Mitigation direction

  • Upgrade to a vendor kernel containing the referenced stable cdns3 fixes.
  • Apply relevant distribution advisories, including Debian LTS guidance where applicable.
  • Prioritize devices using USB gadget mode or Cadence CDNS3 controller support.
  • If upgrade timing is constrained, check vendor guidance for supported temporary risk reduction.
  • Avoid assuming exposure without confirming the driver and USB gadget path are used.

Validation and detection

  • Inventory Linux kernel versions and distribution security update status.
  • Check whether the cdns3 driver is built, loaded, or enabled in target kernels.
  • Identify systems using USB gadget or FunctionFS workflows.
  • Confirm deployed kernels include the referenced stable fix commits or vendor backports.
  • Review kernel logs for related KFENCE, use-after-free, or cdns3 fault reports.
Prepared
Confidence
high
Sources
10

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-2024-26749 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
2ADP providers
9Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

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.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux7733f6c32e36ff9d7adadf40001039bf219b1cbe, 7733f6c32e36ff9d7adadf40001039bf219b1cbe, 7733f6c32e36ff9d7adadf40001039bf219b1cbe, 7733f6c32e36ff9d7adadf40001039bf219b1cbe, 7733f6c32e36ff9d7adadf40001039bf219b1cbe, 7733f6c32e36ff9d7adadf40001039bf219b1cbe, 7733f6c32e36ff9d7adadf40001039bf219b1cbeunaffected
LinuxLinux5.4, 0, 5.4.270, 5.10.211, 5.15.150, 6.1.80, 6.6.19, 6.7.7, 6.8affected
Weakness

CWE details

No CWE listed

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