# CVE-2021-47413: linux: In the Linux kernel, the following vulnerability has been resolved:  usb: chipidea: ci_hdrc_imx: Also search for 'phy...

CVE-2021-47413 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47413, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47413
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  usb: chipidea: ci_hdrc_imx: Also search for 'phys' phandle  When passing 'phys' in the devicetree to describe the USB PHY phandle (which is the recommended way according to Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt) the following NULL pointer dereference is observed on i.MX7 and i.MX8MM:  [    1.489344] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000098 [    1.498170] Mem abort info: [    1.500966]   ESR = 0x96000044 [    1.504030]   EC = 0x25: DABT (current EL), IL = 32 bits [    1.509356]   SET = 0, FnV = 0 [    1.512416]   EA = 0, S1PTW = 0 [    1.515569]   FSC = 0x04: level 0 translation fault [    1.520458] Data abort info: [    1.523349]   ISV = 0, ISS = 0x00000044 [    1.527196]   CM = 0, WnR = 1 [    1.530176] [0000000000000098] user address but active_mm is swapper [    1.536544] Internal error: Oops: 96000044 [#1] PREEMPT SMP [    1.542125] Modules linked in: [    1.545190] CPU: 3 PID: 7 Comm: kworker/u8:0 Not tainted 5.14.0-dirty #3 [    1.551901] Hardware name: Kontron i.MX8MM N801X S (DT) [    1.557133] Workqueue: events_unbound deferred_probe_work_func [    1.562984] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO BTYPE=--) [    1.568998] pc : imx7d_charger_detection+0x3f0/0x510 [    1.573973] lr : imx7d_charger_detection+0x22c/0x510  This happens because the charger functions check for the phy presence inside the imx_usbmisc_data structure (data->usb_phy), but the chipidea core populates the usb_phy passed via 'phys' inside 'struct ci_hdrc' (ci->usb_phy) instead.  This causes the NULL pointer dereference inside imx7d_charger_detection().  Fix it by also searching for 'phys' in case 'fsl,usbphy' is not found.  Tested on a imx7s-warp board.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.12-1 | [DEBIAN-CVE-2021-47413](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47413.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.12-1 | [DEBIAN-CVE-2021-47413](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47413.md) | May 21, 2024 |
| Linux | linux Debian 14 | 5.14.12-1 | [DEBIAN-CVE-2021-47413](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47413.md) | May 21, 2024 |

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