GHSA-H3JW-23R7-CV6P

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-20 15:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

net: ethernet: cortina: Make RX SKB per-port

The SKB used to assemble packets from fragments in gmac_rx() is static local, but the Gemini has two ethernet ports, meaning there can be races between the ports on a bad day if a device is using both.

Make the RX SKB a per-port variable and carry it over between invocations in the port struct instead.

Zero the pointer once we call napi_gro_frags(), on error (after calling napi_free_frags()) or if the port is stopped.

Zero it in some place where not strictly necessary just to emphasize what is going on.

This was found by Sashiko during normal patch review.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-64056"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:46Z",
    "severity": "CRITICAL"
  },
  "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.",
  "id": "GHSA-h3jw-23r7-cv6p",
  "modified": "2026-07-20T15:31:57Z",
  "published": "2026-07-19T18:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64056"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06937db21ee311ed07eba47954447245041a982d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/27856d533eca3804008695f61c1e4d5ff984196b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3b249988d774dacf13b203817e971934a42243c4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67a35e7da7ef9d2f000aa758552a128324c604a0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6bba24e9ebe6f1c0b356cd471e36bdc7fa434897"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/72158ea185b27afae163949b0e86164cb6b64e55"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6b22824b30e48ce1df3a2e80990f4b8505deb50"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cfd62907f3cdbc3b6da8f49ba907c0390018fe5e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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