{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-90316",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-90316"
  ],
  "published": "2026-09-17T16:10:40Z",
  "summary": "drm/omap: dsi: Do not copy isr table",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/omap: dsi: Do not copy isr table\n\nTo be able to unregister stuff from isrs, the corresponding table was\ncopied.  Nobody seems to unregister stuff that way, so it does not help.\nBut there are stack-allocated objects passed to these isrs giving chances\nof UAF of these objects if irqs are unregistered while they are handled,\nso better do not copy that table.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.188",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-90316"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b3cbd1451c240446ce170f514244e1cb65ec0de4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f6733460b6d483dea7bfb5cfceb11cbff31a60b7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/542a6a3ec77cd29f953987f7263f32fb8acb097e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2c27a84ba8d1bfed046d0067161d92001605accc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9063b30faae8ccaacf003735560df3956dbb592f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/30810bdf273b4c93f8731b96a7204f33e052180d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/97c03b32b28a9f7f13f768f2b06e1eaafe850e66"
    }
  ],
  "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 - The UAF is reached from local DRM_IOCTL_MODE_ATOMIC on /dev/dri/card*: dsi_bridge_disable()\u2192dsi_disable()\u2192dsi_sync_vc(), or a command-mode pageflip via omap_crtc_flush()\u2192dsi_update_channel()\u2192_dsi_send_nop()\u2192dsi_vc_send_bta_sync(). Those register stack objects that omap_dsi_irq_handler() later fires from isr_tables_copy; no remote protocol carries this.\nAC:L - The attacker repeats those commits/pageflips so dsi_vc_send_bta_sync()/dsi_sync_vc_vp() register a stack completion then dsi_unregister_isr_vc() after wait_for_completion_timeout(), while DSI BTA/PACKET_SENT IRQs run omap_dsi_irq_handler() on another CPU against the copied table; both sides of the copy-vs-unregister race are attacker-driven.\nPR:L - DRM_IOCTL_MODE_ATOMIC is gated by DRM_MASTER in drm_ioctl_permit(), not CAP_SYS_ADMIN. drm_master_open() makes the first opener of an unclaimed omapdrm card the master, and a seat/video-group user on AM57x/OMAP DSI hardware typically holds that; this is ordinary local privilege, not init-namespace root.\nUI:N - The attacker opens /dev/dri/card* and submits their own atomic commits or dirty/page-flip ioctls that call dsi_vc_send_bta_sync() or dsi_sync_vc(); no other user must mount media, confirm a prompt, or attach a panel.\nS:U - dsi_call_isrs() running dsi_completion_handler()/dsi_packet_sent_handler_vp() corrupts kernel stack in the same kernel that hosts omapdrm; this is local kernel memory corruption, not a VM, IOMMU, or sandbox-boundary escape.\nC:H - dsi_call_isrs() invokes dsi_packet_sent_handler_vp/l4 with isr_data->arg still pointing at a returned dsi_packet_sent_handler_data / DECLARE_COMPLETION_ONSTACK frame; after reuse that object is read as a fake dsi pointer through dsi_read_reg()/REG_GET, which is a UAF read of kernel memory.\nI:H - The same dangling arg is passed to complete() in dsi_completion_handler and to complete(vp_data->completion) in the packet-sent handlers; a reused stack slot that overwrites the completion pointer lets complete() lock and wake a wait-queue at an attacker-influenced address, a kernel write/control-flow hijack.\nA:H - complete() on a freed stack completion, or dsi_read_reg() through a dangling dsi_data in dsi_packet_sent_handler_vp, oopses or panics the kernel even if the UAF is not turned into a full write primitive."
    }
  }
}