CVE-2026-64331

CVE CVE-2026-64331EUVD EUVD-2026-48875Published 2026-07-25T08:49:58.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: usbip: vudc: fix NULL deref in vep_dequeue() vep_alloc_request() wasn't initializing vrequest->udc, so cancellations on the FunctionFS AIO path were arriving in vep_dequeue without a valid UDC reference. Since vrequest->udc is never actually properly used anywhere, we opt to remove it, and update vep_dequeue to obtain a reference to the udc with ep_to_vudc(), consistent with the other vep_ ops. AFAICT this bug has existed for ~10 years. Seems that nobody has really stressed the FunctionFS AIO path on usbip's vudc. I tested this fix in a QEMU aarch64 guest driving FunctionFS endpoints via AIO. Before the fix, running `usbip attach` from the host would cause the guest to oops with the following backtrace: Call trace: vep_dequeue+0x1c/0xe4 (P) usb_ep_dequeue+0x14/0x20 ffs_aio_cancel+0x24/0x34 __arm64_sys_io_cancel+0xb0/0x124 do_el0_svc+0x68/0x100 el0_svc+0x18/0x5c el0t_64_sync_handler+0x98/0xdc el0t_64_sync+0x154/0x158

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux b6a0ca11186759ad7045d68a5447b1e89f658384 <347b59e9f96719d89b6ef555d02a18ada1a5846f; b6a0ca11186759ad7045d68a5447b1e89f658384 <c5371e0b91b24159a3ebaa61e70b0980bcf03c0a; patch: 0; 4.7; b6a0ca11186759ad7045d68a5447b1e89f658384 <d0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97; b6a0ca11186759ad7045d68a5447b1e89f658384 <0443e4416aa1ee97748d1ed904eaf3352c60045e; patch: 6.18.39; patch: 6.1.178; patch: 6.6.145; patch: 5.10.261; b6a0ca11186759ad7045d68a5447b1e89f658384 <0025276175fbbe0dcbf3f84d090b0adee769e9d9; patch: 7.1.4; patch: 6.12.96; b6a0ca11186759ad7045d68a5447b1e89f658384 <9858c91d9ee6a13c45311569039413729fc9b757; patch: 7.2-rc3; b6a0ca11186759ad7045d68a5447b1e89f658384 <1226293ec9bed3d4cc5b05eeeb811d315ca51652; patch: 5.15.212; b6a0ca11186759ad7045d68a5447b1e89f658384 <3750f75f29f99c0223601e2ee73ad084adec47bd

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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