CVE-2026-80794 (GCVE-0-2026-80794)
Vulnerability from cvelistv5
Published
2026-09-04 15:13
Modified
2026-09-04 15:13
Severity ?
VLAI Severity ?
EPSS score ?
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
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 Version: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 Version: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 Version: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 Version: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 Version: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 Version: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 Version: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 Version: e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 |
||
{
"containers": {
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{
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],
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"negate": false,
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],
"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."
}
],
"providerMetadata": {
"dateUpdated": "2026-09-04T15:13:07.169Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/1007a6b429d756513abd25bd00290908f2e89a4a"
},
{
"url": "https://git.kernel.org/stable/c/4bda9ef8392710f21e99027467f3f4afdfb5c99a"
},
{
"url": "https://git.kernel.org/stable/c/fe69fed3495f676578d49414a069ad7d8468e2ce"
},
{
"url": "https://git.kernel.org/stable/c/7489f59d1ea2d3298aa41de7baf193e5e6e132f6"
},
{
"url": "https://git.kernel.org/stable/c/7086dab72b3ed95df96842801e10e935cfeb27a3"
},
{
"url": "https://git.kernel.org/stable/c/0d4b5cfab6891a5ca0f6aef209beebba4bd7c095"
},
{
"url": "https://git.kernel.org/stable/c/5bd00c0e1470d90d77a7c60242854257ddf14e00"
},
{
"url": "https://git.kernel.org/stable/c/d6f743d3d388913135681cde051c08823730194f"
},
{
"url": "https://git.kernel.org/stable/c/8cbe06c1e699c0a165dae5093a2550e65f914818"
}
],
"title": "nfc: nci: fix uninit-value in the RF discover/activated NTF handlers",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80794",
"datePublished": "2026-09-04T15:13:07.169Z",
"dateReserved": "2026-08-26T14:34:25.793Z",
"dateUpdated": "2026-09-04T15:13:07.169Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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