nfc: st21nfca: validate ATR_REQ length against the received frame
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.
CVE-2026-80823
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-80823
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "1892bf844ea0261736bd5e75546fc996e9daeedf",
"lessThan": "785df00bb3ae3206674a43284eb06dac575b5c64",
"versionType": "git"
},
{
"status": "affected",
"version": "1892bf844ea0261736bd5e75546fc996e9daeedf",
"lessThan": "2c1ad291f4cdc357f9527b688c6fda9c6ffa7890",
"versionType": "git"
},
{
"status": "affected",
"version": "1892bf844ea0261736bd5e75546fc996e9daeedf",
"lessThan": "dd26d30f40c43ad9cfe2f25c6ea0ead1dd51d5aa",
"versionType": "git"
},
{
"status": "affected",
"version": "1892bf844ea0261736bd5e75546fc996e9daeedf",
"lessThan": "9635507fe82949e429b3cd938876a9917125b151",
"versionType": "git"
},
{
"status": "affected",
"version": "1892bf844ea0261736bd5e75546fc996e9daeedf",
"lessThan": "0f344944c506b4f02d2b098489f7268b438c369e",
"versionType": "git"
},
{
"status": "affected",
"version": "1892bf844ea0261736bd5e75546fc996e9daeedf",
"lessThan": "bfcca5f42c9aa4eadef1e5fe7bb23783d7fcc96d",
"versionType": "git"
},
{
"status": "affected",
"version": "1892bf844ea0261736bd5e75546fc996e9daeedf",
"lessThan": "304f5b414f4051d324b8c4a3ab0e79f7dc7e150e",
"versionType": "git"
},
{
"status": "affected",
"version": "1892bf844ea0261736bd5e75546fc996e9daeedf",
"lessThan": "f33cecf69095c43be88567fef92b180b858f7369",
"versionType": "git"
},
{
"status": "affected",
"version": "1892bf844ea0261736bd5e75546fc996e9daeedf",
"lessThan": "5cdcca5d62a66eda6b774110a44cba67bc1a8d1d",
"versionType": "git"
}
],
"programFiles": [
"drivers/nfc/st21nfca/dep.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.267",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.218",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.185",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.154",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.106",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.47",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.11",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2.1",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/nfc/st21nfca/dep.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80823
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #34839 · Revision 1
- Added to Heist Feed
- Publisher date