UnratedFix available

nfc: s3fwrn5: allocate rx skb before consuming bytes

Type: advisorySources: OSV

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.

Products: Kernel
Affected versions: Not specified
Fixed versions: 5.15.209, 6.1.175, 6.12.83, 6.18.24, 6.19.14, 6.6.136
CVEs: CVE-2026-43098
Confirmed fixed CVEs: Not specified
Updated in this feed: 2 Nov 2026, 23:22 UTC · Revision 1

Source evidence

nfc: s3fwrn5: allocate rx skb before consuming bytes

core-osv · Original source

Published 6 May 2026, 07:40 UTC

osv:CVE-2026-43098

Kernel

Fixed versions: 5.15.209, 6.1.175, 6.6.136, 6.12.83, 6.18.24, 6.19.14

Complete source record

{
  "id": "2e143a360636adb3bf7d48a39c820440c957632d6a5eb8c54d778b438a0217e1",
  "url": "https://osv.dev/vulnerability/CVE-2026-43098",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "nfc: s3fwrn5: allocate rx skb before consuming bytes",
    "summary": "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.",
    "evidence": "osv:CVE-2026-43098",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.209",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.175",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.136",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.83",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.24",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.14",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-43098",
      "aliases": [
        "CVE-2026-43098"
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "fixed": "20a57de2e79b797ed75382659d52bf4c7d9cb446"
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                {
                  "fixed": "e4ab0fd1c91882f2a7846b1817781c8741f7f315"
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                {
                  "fixed": "d8c2aa3c4a1ec530a485e46a1c4f1a118bb00156"
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                {
                  "fixed": "7c31f7a599cf00fad3c204092a91a924126c67e4"
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                {
                  "fixed": "6d931680a9851481c3243689488eafed08eeff71"
                },
                {
                  "fixed": "09822d3d6f68a0cdc4626e0c507324a4927f55a9"
                },
                {
                  "fixed": "5c14a19d5b1645cce1cb1252833d70b23635b632"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43098.json"
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        },
        {
          "ranges": [
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              "type": "ECOSYSTEM",
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                  "introduced": "5.11.0"
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                  "introduced": "5.16.0"
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            {
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                {
                  "introduced": "6.2.0"
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                {
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            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "6.7.0"
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                {
                  "fixed": "6.12.83"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.24"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "6.19.14"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43098.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.665291442Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/09822d3d6f68a0cdc4626e0c507324a4927f55a9",
        "https://git.kernel.org/stable/c/20a57de2e79b797ed75382659d52bf4c7d9cb446",
        "https://git.kernel.org/stable/c/5c14a19d5b1645cce1cb1252833d70b23635b632",
        "https://git.kernel.org/stable/c/6d931680a9851481c3243689488eafed08eeff71",
        "https://git.kernel.org/stable/c/7c31f7a599cf00fad3c204092a91a924126c67e4",
        "https://git.kernel.org/stable/c/d8c2aa3c4a1ec530a485e46a1c4f1a118bb00156",
        "https://git.kernel.org/stable/c/e4ab0fd1c91882f2a7846b1817781c8741f7f315",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43098.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-43098",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43098.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-43098",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 490864,
  "published_at": "2026-05-06T07:40:28.845+00:00"
}