# CVE-2026-45911: usb: cdns3: fix role switching during resume

> A NULL pointer dereference in the Linux kernel's cdns3 USB driver during resume can cause a system crash, requiring a kernel patch.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 27 May 2026
- **Updated:** 27 May 2026
- **Also known as:** BELL-CVE-2026-45911, DEBIAN-CVE-2026-45911, GHSA-jj6w-3723-c335, ROOT-OS-UBUNTU-2204-CVE-2026-45911, ROOT-OS-UBUNTU-2404-CVE-2026-45911, UBUNTU-CVE-2026-45911

## What is CVE-2026-45911?

CVE-2026-45911 is a medium-severity vulnerability in Linux kernel, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

usb: cdns3: fix role switching during resume

If the role change while we are suspended, the cdns3 driver switches to the
new mode during resume. However, switching to host mode in this context
causes a NULL pointer dereference.

The host role's start() operation registers a xhci-hcd device, but its
probe is deferred while we are in the resume path. The host role's resume()
operation assumes the xhci-hcd device is already probed, which is not the
case, leading to the dereference. Since the start() operation of the new
role is already called, the resume operation can be skipped.

So skip the resume operation for the new role if a role switch occurs
during resume. Once the resume sequence is complete, the xhci-hcd device
can be probed in case of host mode.

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000208
Mem abort info:
...
Data abort info:
...
[0000000000000208] pgd=0000000000000000, p4d=0000000000000000
Internal error: Oops: 0000000096000004 [#1]  SMP
Modules linked in:
CPU: 0 UID: 0 PID: 146 Comm: sh Not tainted
6.19.0-rc7-00013-g6e64f4aabfae-dirty #135 PREEMPT
Hardware name: Texas Instruments J7200 EVM (DT)
pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : usb_hcd_is_primary_hcd+0x0/0x1c
lr : cdns_host_resume+0x24/0x5c
...
Call trace:
 usb_hcd_is_primary_hcd+0x0/0x1c (P)
 cdns_resume+0x6c/0xbc
 cdns3_controller_resume.isra.0+0xe8/0x17c
 cdns3_plat_resume+0x18/0x24
 platform_pm_resume+0x2c/0x68
 dpm_run_callback+0x90/0x248
 device_resume+0x100/0x24c
 dpm_resume+0x190/0x2ec
 dpm_resume_end+0x18/0x34
 suspend_devices_and_enter+0x2b0/0xa44
 pm_suspend+0x16c/0x5fc
 state_store+0x80/0xec
 kobj_attr_store+0x18/0x2c
 sysfs_kf_write+0x7c/0x94
 kernfs_fop_write_iter+0x130/0x1dc
 vfs_write+0x240/0x370
 ksys_write+0x70/0x108
 __arm64_sys_write+0x1c/0x28
 invoke_syscall+0x48/0x10c
 el0_svc_common.constprop.0+0x40/0xe0
 do_el0_svc+0x1c/0x28
 el0_svc+0x34/0x108
 el0t_64_sync_handler+0xa0/0xe4
 el0t_64_sync+0x198/0x19c
Code: 52800003 f9407ca5 d63f00a0 17ffffe4 (f9410401)
---[ end trace 0000000000000000 ]---

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2026-45911?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2026-45911?

Apply the vendor's patch.

## Is CVE-2026-45911 being exploited?

There is no known exploitation of CVE-2026-45911 in the wild and no public exploit code.

## Other vulnerabilities in Linux kernel

- [CVE-2026-53266](https://insights.sbomify.com/CVE-2026-53266/): Linux Kernel Out-of-Bounds Write (high 8.8, exploited in the wild)
- [CVE-2013-6282](https://insights.sbomify.com/CVE-2013-6282/): Linux Kernel Improper Input Validation (high 8.8, exploited in the wild)
- [CVE-2022-0185](https://insights.sbomify.com/CVE-2022-0185/): Linux Kernel Heap-Based Buffer Overflow (high 8.4, exploited in the wild)
- [CVE-2013-2094](https://insights.sbomify.com/CVE-2013-2094/): Linux Kernel Privilege Escalation (high 8.4, exploited in the wild)
- [CVE-2026-53362](https://insights.sbomify.com/CVE-2026-53362/): Linux Kernel Unspecified (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-45911 and fix it if it is affected.

What it is: CVE-2026-45911 is a medium-severity vulnerability in Linux kernel, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-45911 in the wild and no public exploit code.

Affected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-45911/ (Markdown: https://insights.sbomify.com/CVE-2026-45911/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-45911
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-45911
- OSV: https://osv.dev/vulnerability/CVE-2026-45911

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-45911/
Summaries are generated and may contain mistakes; the official description above is the record.