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FKIE_CVE-2026-80794

Vulnerability from fkie_nvd - Published: 2026-09-04 16:18 - Updated: 2026-09-04 16:18
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: nfc: nci: fix uninit-value in the RF discover/activated NTF handlers nci_rf_discover_ntf_packet() and nci_rf_intf_activated_ntf_packet() each parse a notification into an on-stack struct (nci_rf_discover_ntf / nci_rf_intf_activated_ntf) that is not initialised. The RF technology-specific parameters are only extracted when rf_tech_specific_params_len is non-zero, so a notification that reports a zero length leaves the rf_tech_specific_params union uninitialised - and both handlers then pass it to nci_add_new_protocol(), which reads it: - discover: nci_add_new_target() -> nci_add_new_protocol(); - activated: nci_target_auto_activated() -> nci_add_new_protocol(). nci_add_new_protocol() uses nfca_poll->nfcid1_len as both a branch condition and a memcpy() length and copies nfcid1/sens_res/sel_res into ndev->targets, which is later exposed to user space via NFC_CMD_GET_TARGET. BUG: KMSAN: uninit-value in nci_add_new_protocol+0x624/0x6c0 nci_add_new_protocol+0x624/0x6c0 nci_ntf_packet+0x25b2/0x3c30 nci_rx_work+0x318/0x5d0 process_scheduled_works+0x84b/0x17a0 worker_thread+0xc10/0x11b0 kthread+0x376/0x500 Local variable ntf.i created at: nci_ntf_packet+0xbc2/0x3c30 Zero-initialise both on-stack notifications so the union reads back as zero when no technology-specific parameters are present.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0d4b5cfab6891a5ca0f6aef209beebba4bd7c095
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1007a6b429d756513abd25bd00290908f2e89a4a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4bda9ef8392710f21e99027467f3f4afdfb5c99a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5bd00c0e1470d90d77a7c60242854257ddf14e00
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7086dab72b3ed95df96842801e10e935cfeb27a3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7489f59d1ea2d3298aa41de7baf193e5e6e132f6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8cbe06c1e699c0a165dae5093a2550e65f914818
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d6f743d3d388913135681cde051c08823730194f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fe69fed3495f676578d49414a069ad7d8468e2ce
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/nfc/nci/ntf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1007a6b429d756513abd25bd00290908f2e89a4a",
              "status": "affected",
              "version": "e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20",
              "versionType": "git"
            },
            {
              "lessThan": "4bda9ef8392710f21e99027467f3f4afdfb5c99a",
              "status": "affected",
              "version": "e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20",
              "versionType": "git"
            },
            {
              "lessThan": "fe69fed3495f676578d49414a069ad7d8468e2ce",
              "status": "affected",
              "version": "e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20",
              "versionType": "git"
            },
            {
              "lessThan": "7489f59d1ea2d3298aa41de7baf193e5e6e132f6",
              "status": "affected",
              "version": "e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20",
              "versionType": "git"
            },
            {
              "lessThan": "7086dab72b3ed95df96842801e10e935cfeb27a3",
              "status": "affected",
              "version": "e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20",
              "versionType": "git"
            },
            {
              "lessThan": "0d4b5cfab6891a5ca0f6aef209beebba4bd7c095",
              "status": "affected",
              "version": "e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20",
              "versionType": "git"
            },
            {
              "lessThan": "5bd00c0e1470d90d77a7c60242854257ddf14e00",
              "status": "affected",
              "version": "e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20",
              "versionType": "git"
            },
            {
              "lessThan": "d6f743d3d388913135681cde051c08823730194f",
              "status": "affected",
              "version": "e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20",
              "versionType": "git"
            },
            {
              "lessThan": "8cbe06c1e699c0a165dae5093a2550e65f914818",
              "status": "affected",
              "version": "e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/nfc/nci/ntf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.3"
            },
            {
              "lessThan": "3.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.269",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.218",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.185",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.154",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.106",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.47",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "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: nci: fix uninit-value in the RF discover/activated NTF handlers\n\nnci_rf_discover_ntf_packet() and nci_rf_intf_activated_ntf_packet() each\nparse a notification into an on-stack struct (nci_rf_discover_ntf /\nnci_rf_intf_activated_ntf) that is not initialised. The RF\ntechnology-specific parameters are only extracted when\nrf_tech_specific_params_len is non-zero, so a notification that reports a\nzero length leaves the rf_tech_specific_params union uninitialised - and\nboth handlers then pass it to nci_add_new_protocol(), which reads it:\n\n - discover:  nci_add_new_target() -\u003e nci_add_new_protocol();\n - activated: nci_target_auto_activated() -\u003e nci_add_new_protocol().\n\nnci_add_new_protocol() uses nfca_poll-\u003enfcid1_len as both a branch\ncondition and a memcpy() length and copies nfcid1/sens_res/sel_res into\nndev-\u003etargets, which is later exposed to user space via NFC_CMD_GET_TARGET.\n\n  BUG: KMSAN: uninit-value in nci_add_new_protocol+0x624/0x6c0\n   nci_add_new_protocol+0x624/0x6c0\n   nci_ntf_packet+0x25b2/0x3c30\n   nci_rx_work+0x318/0x5d0\n   process_scheduled_works+0x84b/0x17a0\n   worker_thread+0xc10/0x11b0\n   kthread+0x376/0x500\n  Local variable ntf.i created at:\n   nci_ntf_packet+0xbc2/0x3c30\n\nZero-initialise both on-stack notifications so the union reads back as\nzero when no technology-specific parameters are present."
    }
  ],
  "id": "CVE-2026-80794",
  "lastModified": "2026-09-04T16:18:05.767",
  "metrics": {},
  "published": "2026-09-04T16:18:05.767",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0d4b5cfab6891a5ca0f6aef209beebba4bd7c095"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1007a6b429d756513abd25bd00290908f2e89a4a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4bda9ef8392710f21e99027467f3f4afdfb5c99a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5bd00c0e1470d90d77a7c60242854257ddf14e00"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7086dab72b3ed95df96842801e10e935cfeb27a3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7489f59d1ea2d3298aa41de7baf193e5e6e132f6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8cbe06c1e699c0a165dae5093a2550e65f914818"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d6f743d3d388913135681cde051c08823730194f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fe69fed3495f676578d49414a069ad7d8468e2ce"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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