CVE-2026-80823 (GCVE-0-2026-80823)
Vulnerability from cvelistv5
Published
2026-09-04 15:27
Modified
2026-09-04 15:29
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
nfc: st21nfca: validate ATR_REQ length against the received frame
st21nfca_tm_recv_atr_req() checks that the received ATR_REQ frame is at
least ST21NFCA_ATR_REQ_MIN_SIZE and that the self-declared atr_req->length
is at least sizeof(struct st21nfca_atr_req), but never checks that
atr_req->length does not exceed the actual received length (skb->len).
st21nfca_tm_send_atr_res() then trusts the declared length:
gb_len = atr_req->length - sizeof(struct st21nfca_atr_req);
...
memcpy(atr_res->gbi, atr_req->gbi, gb_len);
so an RF peer that sends a short frame but sets atr_req->length larger
than the frame makes gb_len exceed the general bytes actually present,
and the memcpy reads out of bounds past the received skb. Those bytes are
placed in the ATR_RES and sent back to the peer (kernel-memory disclosure
to a proximity attacker); a larger declared length is an out-of-bounds
read (DoS).
Reject frames whose declared length exceeds the received length. The
adjacent nfc_tm_activated() path in the same function already derives its
general-bytes length from skb->len rather than the declared field.
Found by 0sec (https://0sec.ai) using automated source analysis; the
missing bound is evident from source. Compile-tested.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 1892bf844ea0261736bd5e75546fc996e9daeedf Version: 1892bf844ea0261736bd5e75546fc996e9daeedf Version: 1892bf844ea0261736bd5e75546fc996e9daeedf Version: 1892bf844ea0261736bd5e75546fc996e9daeedf Version: 1892bf844ea0261736bd5e75546fc996e9daeedf Version: 1892bf844ea0261736bd5e75546fc996e9daeedf Version: 1892bf844ea0261736bd5e75546fc996e9daeedf Version: 1892bf844ea0261736bd5e75546fc996e9daeedf Version: 1892bf844ea0261736bd5e75546fc996e9daeedf |
||
{
"containers": {
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"product": "Linux",
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},
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}
]
}
],
"cpeApplicability": [
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: st21nfca: validate ATR_REQ length against the received frame\n\nst21nfca_tm_recv_atr_req() checks that the received ATR_REQ frame is at\nleast ST21NFCA_ATR_REQ_MIN_SIZE and that the self-declared atr_req-\u003elength\nis at least sizeof(struct st21nfca_atr_req), but never checks that\natr_req-\u003elength does not exceed the actual received length (skb-\u003elen).\n\nst21nfca_tm_send_atr_res() then trusts the declared length:\n\n\tgb_len = atr_req-\u003elength - sizeof(struct st21nfca_atr_req);\n\t...\n\tmemcpy(atr_res-\u003egbi, atr_req-\u003egbi, gb_len);\n\nso an RF peer that sends a short frame but sets atr_req-\u003elength larger\nthan the frame makes gb_len exceed the general bytes actually present,\nand the memcpy reads out of bounds past the received skb. Those bytes are\nplaced in the ATR_RES and sent back to the peer (kernel-memory disclosure\nto a proximity attacker); a larger declared length is an out-of-bounds\nread (DoS).\n\nReject frames whose declared length exceeds the received length. The\nadjacent nfc_tm_activated() path in the same function already derives its\ngeneral-bytes length from skb-\u003elen rather than the declared field.\n\nFound by 0sec (https://0sec.ai) using automated source analysis; the\nmissing bound is evident from source. Compile-tested."
}
],
"providerMetadata": {
"dateUpdated": "2026-09-04T15:29:25.316Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/785df00bb3ae3206674a43284eb06dac575b5c64"
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{
"url": "https://git.kernel.org/stable/c/2c1ad291f4cdc357f9527b688c6fda9c6ffa7890"
},
{
"url": "https://git.kernel.org/stable/c/dd26d30f40c43ad9cfe2f25c6ea0ead1dd51d5aa"
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{
"url": "https://git.kernel.org/stable/c/9635507fe82949e429b3cd938876a9917125b151"
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{
"url": "https://git.kernel.org/stable/c/0f344944c506b4f02d2b098489f7268b438c369e"
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{
"url": "https://git.kernel.org/stable/c/bfcca5f42c9aa4eadef1e5fe7bb23783d7fcc96d"
},
{
"url": "https://git.kernel.org/stable/c/304f5b414f4051d324b8c4a3ab0e79f7dc7e150e"
},
{
"url": "https://git.kernel.org/stable/c/f33cecf69095c43be88567fef92b180b858f7369"
},
{
"url": "https://git.kernel.org/stable/c/5cdcca5d62a66eda6b774110a44cba67bc1a8d1d"
}
],
"title": "nfc: st21nfca: validate ATR_REQ length against the received frame",
"x_generator": {
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}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80823",
"datePublished": "2026-09-04T15:27:46.153Z",
"dateReserved": "2026-08-26T14:34:25.795Z",
"dateUpdated": "2026-09-04T15:29:25.316Z",
"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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