CVE-2026-98483 (GCVE-0-2026-98483)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:15 – Updated: 2026-10-19 09:20
VLAI
Title
nfc: fix use-after-free in nfc_get_local_general_bytes
Summary
In the Linux kernel, the following vulnerability has been resolved: nfc: fix use-after-free in nfc_get_local_general_bytes Commit 6709d4b7bc2e ("net: nfc: Fix use-after-free caused by nfc_llcp_find_local") attempted to fix a use-after-free (UAF) issue by invoking nfc_llcp_local_put(local) after accessing local->gb. However, if the reference count drops to zero, local is freed immediately, leading to a use-after-free when callers access the returned pointer. Alternative approaches using dynamic allocation (e.g. kmemdup) introduced memory leaks because callers consistently treat the returned pointer as borrowed memory. Fix this properly by refactoring nfc_llcp_general_bytes() and nfc_get_local_general_bytes() to accept a caller-provided output buffer (out_gb) and its maximum length (gb_max_len). The general bytes are safely copied into out_gb before calling nfc_llcp_local_put(local), ensuring safe lifetime management without ownership transfer complications. Update all callers across drivers (microread, pn533, pn544, st21nfca, digital_dep, and nci) to provide their own destination buffers and pass them to nfc_get_local_general_bytes().
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 96f2c6f272ec04083d828de46285a7d7b17d1aad , < 25bfa673adc70189c0bc872940421ae59f789cf6 (git)
Affected: fc8429f8d86801f092fbfbd257c3af821ac0dcd3 , < 2b31d0cc95856c856ada91f943fb14dfdf29a923 (git)
Affected: 425d9d3a92df7d96b3cfb7ee5c240293a21cbde3 , < c40f61a6a413f3eaf028e5fe367fd9749e503ab0 (git)
Affected: 6709d4b7bc2e079241fdef15d1160581c5261c10 , < 19bcfc2a56d0b82919079b5424c5a9a0ac897dcf (git)
Affected: 6709d4b7bc2e079241fdef15d1160581c5261c10 , < d8c929e9afdbc33b1876ecb97a517e850449b5bd (git)
Affected: 6709d4b7bc2e079241fdef15d1160581c5261c10 , < 841af260ff477f6191872bc3b2e15488615c1827 (git)
Affected: 6709d4b7bc2e079241fdef15d1160581c5261c10 , < 9ede11e12f965ace97c4e0f606667f24fb41e7e1 (git)
Affected: 6709d4b7bc2e079241fdef15d1160581c5261c10 , < dcab71a7011918f6fdba7adcec02d217dcb84b8d (git)
Affected: dd6ff3f3862709ab1a12566e73b9d6a9b8f6e548 (git)
Affected: b3ad46e155a6d91b36c6e892019a43e3ef3c696d (git)
Affected: e5207c1d69b1a9707615ab6ff9376e59fc096815 (git)
Affected: 5.10.188 , < 5.10.271 (semver)
Affected: 5.15.121 , < 5.15.222 (semver)
Affected: 6.1.39 , < 6.1.189 (semver)
Affected: 5.4.251 , < 5.5 (semver)
Affected: 6.3.13 , < 6.4 (semver)
Affected: 6.4.4 , < 6.5 (semver)
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Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: fix use-after-free in nfc_get_local_general_bytes\n\nCommit 6709d4b7bc2e (\"net: nfc: Fix use-after-free caused by\nnfc_llcp_find_local\") attempted to fix a use-after-free (UAF) issue by\ninvoking nfc_llcp_local_put(local) after accessing local-\u003egb. However,\nif the reference count drops to zero, local is freed immediately,\nleading to a use-after-free when callers access the returned pointer.\nAlternative approaches using dynamic allocation (e.g. kmemdup) introduced\nmemory leaks because callers consistently treat the returned pointer as\nborrowed memory.\n\nFix this properly by refactoring nfc_llcp_general_bytes() and\nnfc_get_local_general_bytes() to accept a caller-provided output buffer\n(out_gb) and its maximum length (gb_max_len). The general bytes are\nsafely copied into out_gb before calling nfc_llcp_local_put(local),\nensuring safe lifetime management without ownership transfer complications.\n\nUpdate all callers across drivers (microread, pn533, pn544, st21nfca,\ndigital_dep, and nci) to provide their own destination buffers and pass\nthem to nfc_get_local_general_bytes()."
        }
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          "url": "https://git.kernel.org/stable/c/25bfa673adc70189c0bc872940421ae59f789cf6"
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        {
          "url": "https://git.kernel.org/stable/c/2b31d0cc95856c856ada91f943fb14dfdf29a923"
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        {
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      "title": "nfc: fix use-after-free in nfc_get_local_general_bytes",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98483",
    "datePublished": "2026-10-18T15:15:57.275Z",
    "dateReserved": "2026-09-25T10:25:14.352Z",
    "dateUpdated": "2026-10-19T09:20:20.665Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-98483",
      "date": "2026-10-27",
      "epss": "0.00216",
      "percentile": "0.12015"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-24T14:46:35.000Z",
      "cve": "CVE-2026-98483",
      "id": "msrc_CVE-2026-98483",
      "initial_release_date": "2026-10-20T01:06:56.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "nfc: fix use-after-free in nfc_get_local_general_bytes",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98483.json",
      "version": "4"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
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                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.189",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.158",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.112",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.55",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.9",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: fix use-after-free in nfc_get_local_general_bytes\n\nCommit 6709d4b7bc2e (\"net: nfc: Fix use-after-free caused by\nnfc_llcp_find_local\") attempted to fix a use-after-free (UAF) issue by\ninvoking nfc_llcp_local_put(local) after accessing local-\u003egb. However,\nif the reference count drops to zero, local is freed immediately,\nleading to a use-after-free when callers access the returned pointer.\nAlternative approaches using dynamic allocation (e.g. kmemdup) introduced\nmemory leaks because callers consistently treat the returned pointer as\nborrowed memory.\n\nFix this properly by refactoring nfc_llcp_general_bytes() and\nnfc_get_local_general_bytes() to accept a caller-provided output buffer\n(out_gb) and its maximum length (gb_max_len). The general bytes are\nsafely copied into out_gb before calling nfc_llcp_local_put(local),\nensuring safe lifetime management without ownership transfer complications.\n\nUpdate all callers across drivers (microread, pn533, pn544, st21nfca,\ndigital_dep, and nci) to provide their own destination buffers and pass\nthem to nfc_get_local_general_bytes()."
          }
        ],
        "id": "CVE-2026-98483",
        "lastModified": "2026-10-19T10:18:59.677",
        "metrics": {},
        "published": "2026-10-18T16:16:58.940",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/19bcfc2a56d0b82919079b5424c5a9a0ac897dcf"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/25bfa673adc70189c0bc872940421ae59f789cf6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2b31d0cc95856c856ada91f943fb14dfdf29a923"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/841af260ff477f6191872bc3b2e15488615c1827"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9ede11e12f965ace97c4e0f606667f24fb41e7e1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c40f61a6a413f3eaf028e5fe367fd9749e503ab0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d8c929e9afdbc33b1876ecb97a517e850449b5bd"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/dcab71a7011918f6fdba7adcec02d217dcb84b8d"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-20T11:40:51+00:00",
      "cve": "CVE-2026-98483",
      "id": "CVE-2026-98483",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_not_affected": "277",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nfc: fix use-after-free in nfc_get_local_general_bytes",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98483.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-10-22T16:38:14Z",
      "cve": "CVE-2026-98483",
      "id": "CVE-2026-98483",
      "initial_release_date": "2026-10-22T16:38:14Z",
      "product_status:known_affected": "145",
      "product_status:known_not_affected": "203",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98483",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98483.json",
      "version": "2"
    }
  }
}



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