GHSA-VH7F-9W49-Q39V

Vulnerability from github – Published: 2026-04-24 15:32 – Updated: 2026-04-24 15:32
VLAI?
Details

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

nfc: pn533: allocate rx skb before consuming bytes

pn532_receive_buf() reports the number of accepted bytes to the serdev core. The current code consumes bytes into recv_skb and may already hand a complete frame to pn533_recv_frame() before allocating a fresh receive buffer.

If that alloc_skb() fails, the callback returns 0 even though it has already consumed bytes, and it leaves recv_skb as NULL for the next receive callback. That breaks the receive_buf() accounting contract and can also lead to a NULL dereference on the next skb_put_u8().

Allocate the receive skb lazily before consuming the next byte instead. If allocation fails, return the number of bytes already accepted.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31660"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-24T15:16:45Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: pn533: allocate rx skb before consuming bytes\n\npn532_receive_buf() reports the number of accepted bytes to the serdev\ncore. The current code consumes bytes into recv_skb and may already hand\na complete frame to pn533_recv_frame() before allocating a fresh receive\nbuffer.\n\nIf that alloc_skb() fails, the callback returns 0 even though it has\nalready consumed bytes, and it leaves recv_skb as NULL for the next\nreceive callback. That breaks the receive_buf() accounting contract and\ncan also lead to a NULL dereference on the next skb_put_u8().\n\nAllocate the receive skb lazily before consuming the next byte instead.\nIf allocation fails, return the number of bytes already accepted.",
  "id": "GHSA-vh7f-9w49-q39v",
  "modified": "2026-04-24T15:32:37Z",
  "published": "2026-04-24T15:32:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31660"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07cb6c72e66ba548679f22ac29ad588da8999279"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16649adc2e19509104245ea1f349b629d858f11f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21ae2cda66a55c759607bbf1d23cbaa42019d2de"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2ca64fb7e2d2ae14619dd204d4f2f0a601f421fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e37da42eda45d7859d9273fc7e225d8df458038"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8b71299d587d9e4c830c18afb884c80ddb30ad28"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a9495069b43b8634c1ae0042e888766c34f66637"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c71ba669b570c7b3f86ec875be222ea11dacb352"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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Detection rules are retrieved from Rulezet.