GHSA-QJXF-6753-VC9P

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-14 21:30
VLAI?
Details

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

nfc: s3fwrn5: allocate rx skb before consuming bytes

s3fwrn82_uart_read() reports the number of accepted bytes to the serdev core. The current code consumes bytes into recv_skb and may already deliver a complete 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.

Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-43098"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T10:16:23Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: s3fwrn5: allocate rx skb before consuming bytes\n\ns3fwrn82_uart_read() reports the number of accepted bytes to the serdev\ncore. The current code consumes bytes into recv_skb and may already\ndeliver a complete frame before allocating a fresh receive buffer.\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-qjxf-6753-vc9p",
  "modified": "2026-05-14T21:30:36Z",
  "published": "2026-05-06T12:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43098"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/09822d3d6f68a0cdc4626e0c507324a4927f55a9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5c14a19d5b1645cce1cb1252833d70b23635b632"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d931680a9851481c3243689488eafed08eeff71"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7c31f7a599cf00fad3c204092a91a924126c67e4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d8c2aa3c4a1ec530a485e46a1c4f1a118bb00156"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.