{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68253",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-68253"
  ],
  "published": "2026-08-10T12:08:00Z",
  "summary": "drm/i915/hdcp: check streams[] bounds before overflow",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/hdcp: check streams[] bounds before overflow\n\nThe data->streams[] overflow check is done after the buffer overflow has\nalready happened. Move the overflow check before the write.\n\nSide note, emitting a warning splat with a backtrace might be overkill\nhere, but prefer not changing the behaviour other than not doing the\noverrun.\n\nDiscovered using AI-assisted static analysis confirmed by Intel Product\nSecurity.\n\n(cherry picked from commit 9284ab3b6e776c315883ac2611283d263c9460fd)",
  "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": "6.1.184",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68253"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/336cf6d80d41457442b659e7ba7a7badc0ffe79d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/389079bf04e6f0c6f10f5b879f6d7a9cf80f0567"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/84351f12390349ba010920fc247e1a0b12e41eb3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2106fb490b2c6003e23ad6ff36ce823a2170e138"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3d2ef8d389495e7889c6062d8bddc46d2a5fbdef"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/984085c5b53572e2e03fd5fc4817e86ef1effc6e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bbb15a6b042d02e5508a02b4847e02d2579ee7bc"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-23T12:46:35Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The overflow is reached through a local DRM atomic modeset ioctl on /dev/dri/cardN that sets the \"Content Protection\" connector property, driving intel_hdcp_enable() -> intel_hdcp_prepare_streams(); no network or remote path exists to the i915 display HDCP code.\nAC:L - Any DP MST topology with more connected MST connectors on one digital port than the device has pipes (a common dock/hub/daisy-chain setup, and easily arranged by anyone with access to the machine's display outputs) makes every HDCP enable request overflow the buffer deterministically, with no race or memory-layout condition to win.\nPR:L - The attacker only needs access to the DRM device node as DRM master, which an ordinary user in a local graphical session (video/render group, logind seat) has; no CAP_SYS_ADMIN or root is required to request HDCP content protection on an MST connector.\nUI:N - The attacker performs the atomic commit that requests content protection themselves; no action by another user is needed, and on a system already running a compositor with HDCP desired the overflow occurs automatically on the modeset.\nS:U - The corruption is confined to kernel heap memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The out-of-bounds write corrupts adjacent objects in a small kmalloc slab, and such heap corruption is a standard primitive for pivoting to arbitrary kernel memory disclosure by overwriting neighbouring pointers or length fields.\nI:H - This is a heap out-of-bounds write past a kzalloc'd streams[] buffer sized to INTEL_NUM_PIPES, with attacker-influenced VCPI values and an attacker-controlled overflow length determined by the MST topology, giving corruption of adjacent slab objects that can be leveraged for control-flow hijack.\nA:H - Overwriting adjacent slab allocations reliably produces slab corruption, oops, or panic, and the path can be re-triggered on every HDCP enable/modeset, so the system can be crashed repeatedly."
    }
  }
}