CVE-2026-90044

CVE CVE-2026-90044EUVD EUVD-2026-80652Published 2026-09-16T10:33:41.000ZLast changed 2026-09-21T13:15:18.000ZCVSS 7.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Fix Use-After-Free in AIO error path In ffs_epfile_write_iter() and ffs_epfile_read_iter(), when ffs_epfile_io() fails with an error other than -EIOCBQUEUED, the io_data structure (`p`) is freed. However, for AIO operations, the kiocb cancel function was already armed and kiocb->private was set to `p`. If a concurrent cancel operation (such as sys_io_cancel()) executes after ffs_epfile_io() fails but before the function frees `p`, a Use-After-Free can occur when the cancellation handler accesses the freed pointer. To securely fix this race condition, we must properly un-arm the cancellation. Invoking `kiocb->ki_complete()` does exactly this by acquiring `ctx->ctx_lock` and safely removing the kiocb from the active sequence. In doing so, it ensures that a parallel io_cancel can no longer discover the kiocb, effectively closing the race window. We then return -EIOCBQUEUED to notify the VFS layer that the kiocb has been consumed and it should avoid attempting to complete the request again or triggering subsequent completion handlers.

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 de2080d41b5d584205e408d72021f0f335a046fc <153b5ecd29ed055562400bc17c91df3fd869b0ce; 4.0; patch: 7.2.5; patch: 0; patch: 6.12.111; patch: 7.3-rc1; de2080d41b5d584205e408d72021f0f335a046fc <4a2fb2d12b87b43724230abb52a1440617c7b6cc; de2080d41b5d584205e408d72021f0f335a046fc <b5f0e80a03e87bd932487e03248eae3ba3ed7b45; de2080d41b5d584205e408d72021f0f335a046fc <e78dcb1f7ec271449c54984dc90c62a5ba272de7; patch: 6.18.51

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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