{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64056",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64056"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "net: ethernet: cortina: Make RX SKB per-port",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ethernet: cortina: Make RX SKB per-port\n\nThe SKB used to assemble packets from fragments in gmac_rx()\nis static local, but the Gemini has two ethernet ports, meaning\nthere can be races between the ports on a bad day if a device\nis using both.\n\nMake the RX SKB a per-port variable and carry it over between\ninvocations in the port struct instead.\n\nZero the pointer once we call napi_gro_frags(), on error (after\ncalling napi_free_frags()) or if the port is stopped.\n\nZero it in some place where not strictly necessary just to\nemphasize what is going on.\n\nThis was found by Sashiko during normal patch review.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/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": "6.1.175",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64056"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/27856d533eca3804008695f61c1e4d5ff984196b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b6b22824b30e48ce1df3a2e80990f4b8505deb50"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6bba24e9ebe6f1c0b356cd471e36bdc7fa434897"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3b249988d774dacf13b203817e971934a42243c4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/72158ea185b27afae163949b0e86164cb6b64e55"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cfd62907f3cdbc3b6da8f49ba907c0390018fe5e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/67a35e7da7ef9d2f000aa758552a128324c604a0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/06937db21ee311ed07eba47954447245041a982d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The vulnerable code runs in the netdev RX path (gmac_irq \u2192 napi_schedule \u2192 gmac_napi_poll \u2192 gmac_rx) when Ethernet frames are DMA'd from the wire, so any remote host that can send packets to a reachable Gemini GMAC interface can trigger it.\nAC:L - An attacker controls both sides of the race by flooding one or both GMAC ports with multi-descriptor/jumbo frames to keep skb assembly in progress while concurrent NAPI polls run on the independent per-port IRQ handlers without serialization on the shared static skb pointer.\nPR:N - Exploitation requires only the ability to deliver Ethernet frames to an active interface; there are no authentication gates, capability checks, or local syscalls on the RX path from hardware interrupt through gmac_rx().\nUI:N - Triggering the race requires only crafted or high-volume network traffic; no victim interaction such as mounting a filesystem or opening a file is needed.\nS:U - The corruption is confined to kernel networking state (shared skb assembly between the two GMAC ports on the same host); impact does not cross a VM, IOMMU, or sandbox security boundary.\nC:H - Concurrent corruption of a shared skb and mismatched napi_get_frags/napi_gro_frags/napi_free_frags usage across ports can cause use-after-free and skb metadata corruption that enables arbitrary kernel memory disclosure.\nI:H - Cross-port skb corruption via concurrent skb_fill_page_desc and len updates, plus orphaned or double-freed skb/page state, provides memory corruption primitives that can be leveraged for arbitrary kernel writes or code execution.\nA:H - The race can cause kernel oopses or panics from slab/list corruption, invalid page refcount handling, or crashes inside napi_gro_frags when skb state is corrupted across the two ports."
    }
  }
}