GHSA-93J7-Q4PR-7PMF

Vulnerability from github – Published: 2026-07-19 15:30 – Updated: 2026-07-20 15:31
VLAI
Details

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

net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()

The transmit loop in airoha_dev_xmit() reads fragment address and length during its final iteration, when the loop index equals skb_shinfo(skb)->nr_frags, at which point the fragment data is uninitialized. While these values are never consumed, the read itself is unsafe and may trigger a page fault. Fix this by avoiding the fragment read on the last iteration. Additionally, move the skb pointer from the first to the last used packet descriptor, so that airoha_qdma_tx_napi_poll() defers freeing the skb until the final descriptor is processed.

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-2026-63857"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T15:16:52Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()\n\nThe transmit loop in airoha_dev_xmit() reads fragment address and length\nduring its final iteration, when the loop index equals\nskb_shinfo(skb)-\u003enr_frags, at which point the fragment data is\nuninitialized. While these values are never consumed, the read itself is\nunsafe and may trigger a page fault. Fix this by avoiding the fragment\nread on the last iteration.\nAdditionally, move the skb pointer from the first to the last used packet\ndescriptor, so that airoha_qdma_tx_napi_poll() defers freeing the skb\nuntil the final descriptor is processed.",
  "id": "GHSA-93j7-q4pr-7pmf",
  "modified": "2026-07-20T15:31:48Z",
  "published": "2026-07-19T15:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63857"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bde34e84edc8b5571fbde7e941e175a4293ee1eb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d78c8ab7bd84952e053d0c622b7fc1b4ad8a19a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f670fa4b19ceddc6d215dda4997888ccba9bbc61"
    }
  ],
  "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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