NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 31/100)

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: 0.19% (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 6d7ac60098b206d0472475b666cb09d556bec03d, 6fd50446e7c9a98b4bcf96815f5c9602a16ea472, 7d602f30149a117eea260208b1661bc404c21dfd.

Low priority for now. Upgrade to Linux Linux 6d7ac60098b206d0472475b666cb09d556bec03d, 6fd50446e7c9a98b4bcf96815f5c9602a16ea472, 7d602f30149a117eea260208b1661bc404c21dfd 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: 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().

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

BDU:2026-02576

Published: Jun 18, 2025
Updated: Aug 15, 2026
EPSS: 0.1% · 9th percentile
CWE: CWE-416

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

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

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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.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

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

linux linux kernel5.3 and later · before 5.4.211
linux linux kernel5.5 and later · before 5.10.138
linux linux kernel5.11 and later · before 5.15.63
linux linux kernel5.16 and later · before 5.19.4

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
- 5.4affected
- 6bbf87a131edd39040974f3843ff97e89310ebde and later · before e65d9b7147d7be3504893ca7dfb85286bda83d40affected · git
- 6bbf87a131edd39040974f3843ff97e89310ebde and later · before 6d7ac60098b206d0472475b666cb09d556bec03daffected · git
- 6bbf87a131edd39040974f3843ff97e89310ebde and later · before c3c1dbad3a2db32ecf371c97f2058491b8ba0f9aaffected · git
- 6bbf87a131edd39040974f3843ff97e89310ebde and later · before 6fd50446e7c9a98b4bcf96815f5c9602a16ea472affected · git
- 6bbf87a131edd39040974f3843ff97e89310ebde and later · before 7d602f30149a117eea260208b1661bc404c21dfdaffected · git
- before 5.4not affected · semver
- 5.4.211 and later · up to and including 5.4.*not affected · semver
- 5.10.138 and later · up to and including 5.10.*not affected · semver
- 5.15.63 and later · up to and including 5.15.*not affected · semver

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.0.2-1	6.0.2-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
90Now
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

Published before and after this one in the same product

← EarlierCVE-2022-50032Jun 18, 2025 · usb: renesas: Fix refcount leak bug
22Monitor
← EarlierCVE-2022-50033Jun 18, 2025 · usb: host: ohci-ppc-of: Fix refcount leak bug
22Monitor
Later →CVE-2022-50035Jun 18, 2025 · drm/amdgpu: Fix use-after-free on amdgpu_bo_list mutex
31Monitor

Remediation

Which version to upgrade to

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

Product / package	Fixed version	Source
Linux Linux	6d7ac60098b206d0472475b666cb09d556bec03d	Vendor (CNA)
Linux Linux	6fd50446e7c9a98b4bcf96815f5c9602a16ea472	Vendor (CNA)
Linux Linux	7d602f30149a117eea260208b1661bc404c21dfd	Vendor (CNA)
Linux Linux	c3c1dbad3a2db32ecf371c97f2058491b8ba0f9a	Vendor (CNA)
Linux Linux	e65d9b7147d7be3504893ca7dfb85286bda83d40	Vendor (CNA)
debian:linux	6.0.2-1 · Debian:12	Package 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.

No history yet (it accumulates with the daily EPSS job).

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: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

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

Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

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

References

git.kernel.org/stable/c/6d7ac60098b206d0472475b666cb09d556bec03d

Show all references (4 more)

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

All records