CVE-2026-90012
CriticalCVSS 9.8Summary
In the Linux kernel, __spi_map_msg() mishandles DMA mapping ownership on partial map failure. When RX or TX mapping fails, flags and device pointers are not properly cleared, which can lead to re-unmapping or using a NULL/stale device pointer. This can trigger a kernel oops.
Risk Assessment
The flaw can cause a kernel oops or memory corruption during SPI DMA operations, potentially leading to system instability or denial of service.
Recommendation
Update the Linux kernel to a version containing the fix that publishes mapping devices before mapping starts and unwinds all failures through __spi_unmap_msg().
Other vulnerabilities in Linux kernel
See all- CVE-2026-90046High
In the Linux kernel, free_pages_nolock() uses spin_trylock() in NMI context on uniprocessor (UP) systems, which is unsafe. The bug affects the page freeing path and can crash the kernel. It is likely exploitable by local attackers for privilege escalation.
- 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.
- CVE-2026-90044High
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.
- CVE-2026-90043High
In the Linux kernel zram module, the slot lock bit is set in the wrong position on 64-bit big-endian systems. Instead of landing in the flags field, it lands in ac_time, so with ZRAM_TRACK_ENTRY_ACTIME enabled, storing the access time wipes out the held lock bit and lets another CPU take the same slot lock. An access time value with that bit set can make the slot appear locked forever. The fix shifts the lock bit into the flags half on big-endian 64-bit.
- CVE-2026-90041High
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.
- CVE-2026-90039Unknown
In the Linux kernel, NFSD admin state-revocation handlers (unlock_filesystem, NFSD_CMD_UNLOCK_FILESYSTEM, NFSD_CMD_UNLOCK_EXPORT) only check nn->nfsd_serv, which is set before nn->conf_id_hashtbl is allocated. This leads to a NULL dereference when the server has not yet started.
- CVE-2026-90035Unknown
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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: spi: Fix DMA mapping ownership on partial map failure If RX mapping fails after TX mapping succeeds, __spi_map_msg() unmaps TX but leaves tx_sg_mapped set. If TX mapping fails on a later transfer, mappings created for earlier transfers remain active. In both cases, cur_{tx,rx}_dma_dev have not yet been updated because they are assigned only after every transfer has been mapped. The subsequent spi_unmap_msg() may therefore unmap the TX mapping again or release earlier mappings using a NULL or stale device. Using a NULL device can trigger an oops. An empty SG table does not prevent the NULL dereference because dma_unmap_sg_attrs() accesses the device before checking the entry count. Publish both mapping devices before mapping starts and unwind all failures through __spi_unmap_msg(). This clears the mapping flags and releases each mapping once with the device that created it. Publishing the devices before the loop also refreshes them when no transfer needs mapping. No mapping flag is set in that case, so current users do not use the pointers as mapping owners.