CVE-2026-90022
HighCVSS 7.8Summary
In the Linux kernel, f_midi2_opts_str_show() in the USB gadget driver has a use-after-free. Callers dereference the opts->info.<field> pointer before taking the lock, racing with f_midi2_opts_str_store(), which frees the old string under the lock. A concurrent attribute write can cause a read of a freed pointer.
Risk Assessment
A local attacker or concurrent attribute operation can trigger a read of freed memory, causing a kernel crash (denial of service) or potentially privilege escalation.
Recommendation
Update the Linux kernel to a version containing the fix that moves the pointer dereference under the lock in f_midi2_opts_str_show() and updates all three callers.
Other vulnerabilities in Linux kernel
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- CVE-2026-90045High
In the Linux kernel USB gadget ffs driver, the io_data structure stores a pointer to the submitting task's mm_struct but does not hold a reference while async requests are pending. This can cause a use-after-free if the task exits before completion handling finishes. The fix takes a reference with mmgrab() when queuing and releases it with mmdrop() on completion.
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In the Linux kernel USB gadget f_fs driver, a use-after-free exists in the AIO error path. When ffs_epfile_io() fails with an error other than -EIOCBQUEUED, the io_data structure is freed, but the kiocb cancel function remains armed and points to the freed pointer. A concurrent cancel (e.g., sys_io_cancel()) can cause a use-after-free. The fix safely disarms the cancellation via kiocb->ki_complete() and returns -EIOCBQUEUED.
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In the Linux kernel, the HID sony driver fails to remove a controller from the device list when HID core input device registration fails. The devres-managed sony_sc is freed while its list node remains linked, leading to use-after-free when the next matching controller is handled.
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- CVE-2026-90034Unknown
In the Linux kernel, the usb image mdc800 driver uses kmalloc() for irq_urb_buffer and download_urb_buffer in usb_mdc800_init(). If a shorter message is received in mdc800_usb_irq() or mdc800_usb_download_notify(), stack data may leak.
- CVE-2026-90033Unknown
In the Linux kernel, snd_usbmidi_us122l_output() in ALSA usb-audio picks a count of 2 for anything slower than high speed without relating it to ep->max_transfer. With a device declaring a one-byte bulk endpoint, the memset computes 1 - 2 in int and wraps to SIZE_MAX, causing an out-of-bounds write.
- CVE-2026-90024Unknown
A null-pointer dereference vulnerability exists in the Linux kernel's USB gadget MIDI 2.0 function, specifically in f_midi2_free_ep_reqs(). When configuring a MIDI 2.0 gadget via configfs with block direction set to SNDRV_UMP_DIR_INPUT, the midi1_ep_out endpoint is not initialized, leaving usb_ep->card as NULL. When the host later sets the alternate setting, f_midi2_free_ep_reqs() is called for the uninitialized endpoint, causing a kernel crash.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_midi2: fix use-after-free in string attribute show path f_midi2_opts_str_show() takes the string lock internally, but its callers dereference the opts->info.<field> pointer before calling it, outside the lock. This races with f_midi2_opts_str_store(), which frees the old string under opts->lock when the attribute is written concurrently, the show path can read a pointer that gets freed before the lock inside str_show() is even taken. Change f_midi2_opts_str_show() to take a pointer to the string field, matching the existing pattern in f_midi2_opts_str_store(), and dereference it only after the lock is held. Update all three callers (iface_name, block name, and the EP string option macro) accordingly.