CVE-2021-47267: usb: fix various gadget panics on 10gbps cabling
First published: Tue May 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: usb: fix various gadget panics on 10gbps cabling usb_assign_descriptors() is called with 5 parameters, the last 4 of which are the usb_descriptor_header for: full-speed (USB1.1 - 12Mbps [including USB1.0 low-speed @ 1.5Mbps), high-speed (USB2.0 - 480Mbps), super-speed (USB3.0 - 5Gbps), super-speed-plus (USB3.1 - 10Gbps). The differences between full/high/super-speed descriptors are usually substantial (due to changes in the maximum usb block size from 64 to 512 to 1024 bytes and other differences in the specs), while the difference between 5 and 10Gbps descriptors may be as little as nothing (in many cases the same tuning is simply good enough). However if a gadget driver calls usb_assign_descriptors() with a NULL descriptor for super-speed-plus and is then used on a max 10gbps configuration, the kernel will crash with a null pointer dereference, when a 10gbps capable device port + cable + host port combination shows up. (This wouldn't happen if the gadget max-speed was set to 5gbps, but it of course defaults to the maximum, and there's no real reason to artificially limit it) The fix is to simply use the 5gbps descriptor as the 10gbps descriptor, if a 10gbps descriptor wasn't provided. Obviously this won't fix the problem if the 5gbps descriptor is also NULL, but such cases can't be so trivially solved (and any such gadgets are unlikely to be used with USB3 ports any way).
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | <4.9.273 | |
| Linux Kernel | >=4.10<4.14.237 | |
| Linux Kernel | >=4.15<4.19.195 | |
| Linux Kernel | >=4.20<5.4.126 | |
| Linux Kernel | >=5.5<5.10.44 | |
| Linux Kernel | >=5.11<5.12.11 | |
| Linux Kernel | =5.13-rc1 | |
| Linux Kernel | =5.13-rc2 | |
| Linux Kernel | =5.13-rc3 | |
| Linux Kernel | =5.13-rc4 | |
| Linux Kernel | =5.13-rc5 |
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Reference Links
- https://git.kernel.org/stable/c/fd24be23abf3e94260be0f00bb42c7e91d495f87
- https://git.kernel.org/stable/c/70cd19cb5bd94bbb5bacfc9c1e4ee0071699a604
- https://git.kernel.org/stable/c/45f9a2fe737dc0a5df270787f2231aee8985cd59
- https://git.kernel.org/stable/c/5ef23506695b01d5d56a13a092a97f2478069d75
- https://git.kernel.org/stable/c/b972eff874637402ddc4a7dd11fb22538a0b6d28
- https://git.kernel.org/stable/c/ca6bc277430d90375452b60b047763a090b7673e
- https://git.kernel.org/stable/c/032e288097a553db5653af552dd8035cd2a0ba96
Frequently Asked Questions
What is the severity of CVE-2021-47267?
CVE-2021-47267 has a high severity rating due to its potential to cause system crashes.
How do I fix CVE-2021-47267?
To fix CVE-2021-47267, update your Linux kernel to a version that is later than 5.13-rc5.
What versions of the Linux kernel are affected by CVE-2021-47267?
CVE-2021-47267 affects Linux kernel versions from 4.9.273 up to but not including 5.13-rc6.
Is there a workaround for CVE-2021-47267 if I cannot update immediately?
As of now, there are no known effective workarounds for CVE-2021-47267.
What component of the Linux kernel does CVE-2021-47267 affect?
CVE-2021-47267 affects the USB subsystem of the Linux kernel.
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