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CVE-2026-80794 (GCVE-0-2026-80794)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:13 – Updated: 2026-09-04 15:13
VLAI
Title
nfc: nci: fix uninit-value in the RF discover/activated NTF handlers
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 , < 1007a6b429d756513abd25bd00290908f2e89a4a (git)
Affected: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 , < 4bda9ef8392710f21e99027467f3f4afdfb5c99a (git)
Affected: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 , < fe69fed3495f676578d49414a069ad7d8468e2ce (git)
Affected: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 , < 7489f59d1ea2d3298aa41de7baf193e5e6e132f6 (git)
Affected: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 , < 7086dab72b3ed95df96842801e10e935cfeb27a3 (git)
Affected: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 , < 0d4b5cfab6891a5ca0f6aef209beebba4bd7c095 (git)
Affected: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 , < 5bd00c0e1470d90d77a7c60242854257ddf14e00 (git)
Affected: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 , < d6f743d3d388913135681cde051c08823730194f (git)
Affected: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 , < 8cbe06c1e699c0a165dae5093a2550e65f914818 (git)
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Linux Linux Affected: 3.3
Unaffected: 0 , < 3.3 (semver)
Unaffected: 5.10.269 , ≤ 5.10.* (semver)
Unaffected: 5.15.218 , ≤ 5.15.* (semver)
Unaffected: 6.1.185 , ≤ 6.1.* (semver)
Unaffected: 6.6.154 , ≤ 6.6.* (semver)
Unaffected: 6.12.106 , ≤ 6.12.* (semver)
Unaffected: 6.18.47 , ≤ 6.18.* (semver)
Unaffected: 7.1.11 , ≤ 7.1.* (semver)
Unaffected: 7.2.1 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "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."
        }
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    "dateReserved": "2026-08-26T14:34:25.793Z",
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      "date": "2026-09-15",
      "epss": "0.00195",
      "percentile": "0.09417"
    },
    "microsoft_vex": {
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      "cve": "CVE-2026-80794",
      "id": "msrc_CVE-2026-80794",
      "initial_release_date": "2026-09-06T04:48:25.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "nfc: nci: fix uninit-value in the RF discover/activated NTF handlers",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80794.json",
      "version": "3"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/nfc/nci/ntf.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20\",\"lessThan\":\"1007a6b429d756513abd25bd00290908f2e89a4a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20\",\"lessThan\":\"4bda9ef8392710f21e99027467f3f4afdfb5c99a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20\",\"lessThan\":\"fe69fed3495f676578d49414a069ad7d8468e2ce\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20\",\"lessThan\":\"7489f59d1ea2d3298aa41de7baf193e5e6e132f6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20\",\"lessThan\":\"7086dab72b3ed95df96842801e10e935cfeb27a3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20\",\"lessThan\":\"0d4b5cfab6891a5ca0f6aef209beebba4bd7c095\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20\",\"lessThan\":\"5bd00c0e1470d90d77a7c60242854257ddf14e00\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20\",\"lessThan\":\"d6f743d3d388913135681cde051c08823730194f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20\",\"lessThan\":\"8cbe06c1e699c0a165dae5093a2550e65f914818\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/nfc/nci/ntf.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.269\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.218\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.185\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.154\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.106\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.47\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.11\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.1\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-09-08T23:58:50Z",
      "cve": "CVE-2026-80794",
      "id": "CVE-2026-80794",
      "initial_release_date": "2026-09-08T23:58:50Z",
      "product_status:known_affected": "265",
      "product_status:known_not_affected": "88",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80794",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80794.json",
      "version": "2"
    }
  }
}



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Taxonomy of the tags.





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

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • 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.