{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-90388",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-90388"
  ],
  "published": "2026-09-17T16:10:40Z",
  "summary": "iommu/dma: Check atomic pool allocation result directly",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/dma: Check atomic pool allocation result directly\n\nThe non-blocking, non-coherent allocation path uses dma_alloc_from_pool(),\nwhich returns the allocated page and fills cpu_addr only on success.\n\nDo not rely on cpu_addr to detect allocation failure in this path. Check\nthe returned page directly before using it for the IOMMU mapping.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-90388"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ac9cd0a669b8be5d178dbd471b0d68039dac58b5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/db46cb9da83a507d86d2bb080bdb09c865da3d0a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d56c3f955b21e5764c1497e295a5b5d0b3a40470"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/06dffc96693083dda3412311406e558cf27f1574"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a4ace31d732b657d774e31fb444c0c27d42c78e5"
    },
    {
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      "url": "https://git.kernel.org/stable/c/fb0b39287ba894dbdfac2901c51788b63f5c2291"
    },
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      "url": "https://git.kernel.org/stable/c/8c486293ddd0af60991408149fc3e964ea888dc4"
    },
    {
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      "url": "https://git.kernel.org/stable/c/af95a0ebc0a0db0762be75f51eadf770bad01aaa"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-18T17:55:42Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - iommu_dma_alloc() is reached from dma_alloc_attrs() on GFP_ATOMIC dma_alloc_coherent(); local entry points are VIDIOC_STREAMON scheduling mxc_jpeg_device_run()\u2192mxc_jpeg_alloc(), and USBDEVFS_SUBMITURB in proc_do_submiturb()\u2192usb_submit_urb(GFP_ATOMIC)\u2192dma_pool_alloc()\u2192pool_alloc_page(). No remote protocol message supplies the failed allocation.\nAC:L - The attacker drives dma_alloc_from_pool() failure by consuming the atomic gen_pool (repeated GFP_ATOMIC coherent allocs or a size larger than gen_pool_avail) then issues that ioctl; __dma_alloc_from_pool() does not store cpu_addr on failure, so a non-NULL leftover skips the old !cpu_addr check with no victim-side race.\nPR:L - mxc_jpeg_open() and proc_do_submiturb() have no capable() check; an unprivileged local user who can open the JPEG /dev/videoN or a usbfs device node reaches iommu_dma_alloc() without init-namespace root.\nUI:N - The attacker itself issues VIDIOC_QBUF/VIDIOC_STREAMON on its video fd or USBDEVFS_SUBMITURB on its usbfs fd; no separate user must mount, confirm, or plug a device.\nS:U - The leftover cpu_addr is used as a host kernel VA and page_to_phys(NULL) is mapped only in this device's iommu_dma domain via __iommu_dma_map(); that is in-kernel corruption, not a KVM/Xen escape or an extra translation into another VM's memory.\nC:H - iommu_dma_alloc() returns the uninitialized cpu_addr as the coherent buffer; later loads of that object (mxc_jpeg_config_dec_desc()/print_descriptor_info on slot_data.desc, or USB TD completion from a dma_pool block carved out of the wild page) disclose kernel memory through the leftover pointer.\nI:H - Callers store through that pointer: mxc_jpeg_config_dec_desc() writes desc->imgsize/stm_ctrl into jpeg->slot_data.desc, and pool_initialise_page() writes dma_block.next_block into page->vaddr from the failed dma_alloc_from_pool(), a kernel write primitive.\nA:H - page_to_phys(NULL) followed by iommu_map() in __iommu_dma_map(), or a store/load through an unmapped leftover cpu_addr in mxc_jpeg_config_dec_desc() or pool_initialise_page(), oopses or panics the kernel."
    }
  }
}