NFC: digital: Bounds check NFC-A cascade depth in SDD response handler
In the Linux kernel, the following vulnerability has been resolved: NFC: digital: Bounds check NFC-A cascade depth in SDD response handler The NFC-A anti-collision cascade in digital_in_recv_sdd_res() appends 3 or 4 bytes to target->nfcid1 on each round, but the number of cascade rounds is controlled entirely by the peer device. The peer sets the cascade tag in the SDD_RES (deciding 3 vs 4 bytes) and the cascade-incomplete bit in the SEL_RES (deciding whether another round follows). ISO 14443-3 limits NFC-A to three cascade levels and target->nfcid1 is sized accordingly (NFC_NFCID1_MAXSIZE = 10), but nothing in the driver actually enforces this. This means a malicious peer can keep the cascade running, writing past the heap-allocated nfc_target with each round. Fix this by rejecting the response when the accumulated UID would exceed the buffer. Commit e329e71013c9 ("NFC: nci: Bounds check struct nfc_target arrays") fixed similar missing checks against the same field on the NCI path.
CVE-2026-31622
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-2026-31622
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": "2c66daecc4092e6049673c281b2e6f0d5e59a94c",
"lessThan": "9ba6bb09e00b922d902f684f575779e5433fe6e3",
"versionType": "git"
},
{
"status": "affected",
"version": "2c66daecc4092e6049673c281b2e6f0d5e59a94c",
"lessThan": "f83b399aa05a0712e3b1569a30d3d90b3533d2ef",
"versionType": "git"
},
{
"status": "affected",
"version": "2c66daecc4092e6049673c281b2e6f0d5e59a94c",
"lessThan": "20663102c14566e900e1d2f679e30b7f1694f387",
"versionType": "git"
},
{
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"lessThan": "2819f34e08bdffb6f06a51c67948ec5737fb166a",
"versionType": "git"
},
{
"status": "affected",
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"lessThan": "1bec5698b55aa2be5c3b983dba657c01d0fd3dbc",
"versionType": "git"
},
{
"status": "affected",
"version": "2c66daecc4092e6049673c281b2e6f0d5e59a94c",
"lessThan": "5a59bf70c38ee1eb4be03bab830bbc3a6f0bd1f1",
"versionType": "git"
},
{
"status": "affected",
"version": "2c66daecc4092e6049673c281b2e6f0d5e59a94c",
"lessThan": "8d9d9bf3565271ca7ab9c716a94e87296177e7ba",
"versionType": "git"
},
{
"status": "affected",
"version": "2c66daecc4092e6049673c281b2e6f0d5e59a94c",
"lessThan": "cc024a3de265ef6c58957f4990eccb9f806208cb",
"versionType": "git"
},
{
"status": "affected",
"version": "2c66daecc4092e6049673c281b2e6f0d5e59a94c",
"lessThan": "46ce8be2ced389bccd84bcc04a12cf2f4d0c22d1",
"versionType": "git"
}
],
"programFiles": [
"net/nfc/digital_technology.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.136",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.83",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.24",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.14",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0.1",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/nfc/digital_technology.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31622
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #28300 · Revision 1
- Added to Heist Feed
- Publisher date