# CVE-2021-47269: linux: In the Linux kernel, the following vulnerability has been resolved:  usb: dwc3: ep0: fix NULL pointer exception  Ther...

CVE-2021-47269 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47269, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47269
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0026
- 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: dwc3: ep0: fix NULL pointer exception  There is no validation of the index from dwc3_wIndex_to_dep() and we might be referring a non-existing ep and trigger a NULL pointer exception. In certain configurations we might use fewer eps and the index might wrongly indicate a larger ep index than existing.  By adding this validation from the patch we can actually report a wrong index back to the caller.  In our usecase we are using a composite device on an older kernel, but upstream might use this fix also. Unfortunately, I cannot describe the hardware for others to reproduce the issue as it is a proprietary implementation.  [   82.958261] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000a4 [   82.966891] Mem abort info: [   82.969663]   ESR = 0x96000006 [   82.972703]   Exception class = DABT (current EL), IL = 32 bits [   82.978603]   SET = 0, FnV = 0 [   82.981642]   EA = 0, S1PTW = 0 [   82.984765] Data abort info: [   82.987631]   ISV = 0, ISS = 0x00000006 [   82.991449]   CM = 0, WnR = 0 [   82.994409] user pgtable: 4k pages, 39-bit VAs, pgdp = 00000000c6210ccc [   83.000999] [00000000000000a4] pgd=0000000053aa5003, pud=0000000053aa5003, pmd=0000000000000000 [   83.009685] Internal error: Oops: 96000006 [#1] PREEMPT SMP [   83.026433] Process irq/62-dwc3 (pid: 303, stack limit = 0x000000003985154c) [   83.033470] CPU: 0 PID: 303 Comm: irq/62-dwc3 Not tainted 4.19.124 #1 [   83.044836] pstate: 60000085 (nZCv daIf -PAN -UAO) [   83.049628] pc : dwc3_ep0_handle_feature+0x414/0x43c [   83.054558] lr : dwc3_ep0_interrupt+0x3b4/0xc94  ...  [   83.141788] Call trace: [   83.144227]  dwc3_ep0_handle_feature+0x414/0x43c [   83.148823]  dwc3_ep0_interrupt+0x3b4/0xc94 [   83.181546] ---[ end trace aac6b5267d84c32f ]---

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.46-1 | [DEBIAN-CVE-2021-47269](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47269.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.46-1 | [DEBIAN-CVE-2021-47269](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47269.md) | May 21, 2024 |
| Linux | linux Debian 14 | 5.10.46-1 | [DEBIAN-CVE-2021-47269](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47269.md) | May 21, 2024 |

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