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nfc: fdp: bound the device-reported read length and fix an skb leak

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: nfc: fdp: bound the device-reported read length and fix an skb leak fdp_nci_i2c_read() takes the next packet length from two device-supplied bytes and never validates it. The value is a u16 used as the i2c_master_recv() count into a 261-byte on-stack buffer: a malicious, counterfeit or malfunctioning controller (or an i2c bus interposer) can drive it far past the buffer for a stack out-of-bounds write that clobbers the canary and return address, or below the minimum frame size (directly, or by truncating the computed sum) so the header/LRC strip and the next length read run past a short receive. Reject a length outside [FDP_NCI_I2C_MIN_PAYLOAD, FDP_NCI_I2C_MAX_PAYLOAD], as a corrupted packet already is, and force resynchronization. The same loop allocates one data skb per iteration and assumes a length packet followed by a data packet; a device that sends two data packets in one call leaks the first skb when the second allocation overwrites it. Free a previously allocated skb before allocating the next.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.267, 5.15.218, 6.1.185, 6.12.106, 6.18.47, 6.6.154, 7.1.11, 7.2.1
CVEs
CVE-2026-80802
Confirmed fixed CVEs
Not specified
Updated in this feed
6 Nov 2026, 02:28 UTC · Revision 1

Source evidence

nfc: fdp: bound the device-reported read length and fix an skb leak

core-osv · Original source

Published 4 Sept 2026, 15:13 UTC

In the Linux kernel, the following vulnerability has been resolved: nfc: fdp: bound the device-reported read length and fix an skb leak fdp_nci_i2c_read() takes the next packet length from two device-supplied bytes and never validates it. The value is a u16 used as the i2c_master_recv() count into a 261-byte on-stack buffer: a malicious, counterfeit or malfunctioning controller (or an i2c bus interposer) can drive it far past the buffer for a stack out-of-bounds write that clobbers the canary and return address, or below the minimum frame size (directly, or by truncating the computed sum) so the header/LRC strip and the next length read run past a short receive. Reject a length outside [FDP_NCI_I2C_MIN_PAYLOAD, FDP_NCI_I2C_MAX_PAYLOAD], as a corrupted packet already is, and force resynchronization. The same loop allocates one data skb per iteration and assumes a length packet followed by a data packet; a device that sends two data packets in one call leaks the first skb when the second allocation overwrites it. Free a previously allocated skb before allocating the next.

osv:CVE-2026-80802

Kernel

Fixed versions: 5.10.267, 5.15.218, 6.1.185, 6.6.154, 6.12.106, 6.18.47, 7.1.11, 7.2.1

Complete source record
{
  "id": "c31a6d0287feead38180cf1308dd9505cfc4d4fd555887eeb645309be0f04778",
  "url": "https://osv.dev/vulnerability/CVE-2026-80802",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "nfc: fdp: bound the device-reported read length and fix an skb leak",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: nfc: fdp: bound the device-reported read length and fix an skb leak fdp_nci_i2c_read() takes the next packet length from two device-supplied bytes and never validates it. The value is a u16 used as the i2c_master_recv() count into a 261-byte on-stack buffer: a malicious, counterfeit or malfunctioning controller (or an i2c bus interposer) can drive it far past the buffer for a stack out-of-bounds write that clobbers the canary and return address, or below the minimum frame size (directly, or by truncating the computed sum) so the header/LRC strip and the next length read run past a short receive. Reject a length outside [FDP_NCI_I2C_MIN_PAYLOAD, FDP_NCI_I2C_MAX_PAYLOAD], as a corrupted packet already is, and force resynchronization. The same loop allocates one data skb per iteration and assumes a length packet followed by a data packet; a device that sends two data packets in one call leaks the first skb when the second allocation overwrites it. Free a previously allocated skb before allocating the next.",
    "evidence": "osv:CVE-2026-80802",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.267",
            "evidence": "/affected/1/ranges"
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          {
            "value": "5.15.218",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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          },
          {
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          },
          {
            "value": "7.1.11",
            "evidence": "/affected/1/ranges"
          },
          {
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            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-80802",
      "aliases": [
        "CVE-2026-80802"
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      "affected": [
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                {
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        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "4.4.0"
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                {
                  "fixed": "5.10.267"
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            },
            {
              "type": "ECOSYSTEM",
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                  "introduced": "5.11.0"
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                {
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              ]
            },
            {
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                  "introduced": "5.16.0"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80802.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.961965447Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0d723090645b82c1cb27cfd7ebf81f0e7c96bcae",
        "https://git.kernel.org/stable/c/1aa3fc769b0c45bd19f8dab1697084c2b3f6d706",
        "https://git.kernel.org/stable/c/1fc32327b927a6e2cde086f82575c29880844228",
        "https://git.kernel.org/stable/c/7ad21dcfeb5181af0c3ee2608808c0c0a5283aa1",
        "https://git.kernel.org/stable/c/8d2c243b79854628ff076c38748c020042f02f57",
        "https://git.kernel.org/stable/c/d9498ab9a78cb63d78dbe4f221d8cc6c91f285ee",
        "https://git.kernel.org/stable/c/db7e464b350969c6ea8340de00d9796e5fd5123b",
        "https://git.kernel.org/stable/c/e5eec121f2c3bc4c7022613bedd9121a8aa4c949",
        "https://git.kernel.org/stable/c/fc3c2bd5b1ec6c7cbc8a50e32d9bcec114f25463",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80802.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80802",
        "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/2026/80xxx/CVE-2026-80802.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-80802",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 514275,
  "published_at": "2026-09-04T15:13:16.241+00:00"
}