CVE-2026-43156

Summary

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

net: usb: pegasus: enable basic endpoint checking

pegasus_probe() fills URBs with hardcoded endpoint pipes without verifying the endpoint descriptors:

• usb_rcvbulkpipe(dev, 1) for RX data
• usb_sndbulkpipe(dev, 2) for TX data
• usb_rcvintpipe(dev, 3) for status interrupts

A malformed USB device can present these endpoints with transfer types that differ from what the driver assumes.

Add a pegasus_usb_ep enum for endpoint numbers, replacing magic constants throughout. Add usb_check_bulk_endpoints() and usb_check_int_endpoints() calls before any resource allocation to verify endpoint types before use, rejecting devices with mismatched descriptors at probe time, and avoid triggering assertion.

Similar fix to

• commit 90b7f2961798 ("net: usb: rtl8150: enable basic endpoint checking")
• commit 9e7021d2aeae ("net: usb: catc: enable basic endpoint checking")

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/a3e64e950a3981a8199de9798f6d21261b959171
• https://git.kernel.org/stable/c/229dc9b9db475ac900182bafe258943e0e054c6d
• https://git.kernel.org/stable/c/26b3ec62fa1a94ac801feca47f040fc729b3c174
• https://git.kernel.org/stable/c/35854ed5c40b02f95824e44398f9d2ba33727203
• https://git.kernel.org/stable/c/67ba6b13dbcaf45681fb6758794c5ac5fa589a6c
• https://git.kernel.org/stable/c/d2e7c898cc02dfe42443489a67a45ed616cb76e9
• https://git.kernel.org/stable/c/2705709f6574a088aab246af72fc95f2fea51484
• https://git.kernel.org/stable/c/3d7e6ce34f4fcc7083510c28b17a7c36462a25d4

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