NFC: digital: Bounds check NFC-A cascade depth in SDD response handler

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Summary

CVECVE-2026-31622
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:41 UTC
Updated2026-06-01 17:16:53 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000180000 probability, percentile 0.048130000 (date 2026-04-27)

Problem Types: CWE-120

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2c66daecc4092e6049673c281b2e6f0d5e59a94c 9ba6bb09e00b922d902f684f575779e5433fe6e3 git Not specified
CNA Linux Linux affected 2c66daecc4092e6049673c281b2e6f0d5e59a94c f83b399aa05a0712e3b1569a30d3d90b3533d2ef git Not specified
CNA Linux Linux affected 2c66daecc4092e6049673c281b2e6f0d5e59a94c 20663102c14566e900e1d2f679e30b7f1694f387 git Not specified
CNA Linux Linux affected 2c66daecc4092e6049673c281b2e6f0d5e59a94c 2819f34e08bdffb6f06a51c67948ec5737fb166a git Not specified
CNA Linux Linux affected 2c66daecc4092e6049673c281b2e6f0d5e59a94c 1bec5698b55aa2be5c3b983dba657c01d0fd3dbc git Not specified
CNA Linux Linux affected 2c66daecc4092e6049673c281b2e6f0d5e59a94c 5a59bf70c38ee1eb4be03bab830bbc3a6f0bd1f1 git Not specified
CNA Linux Linux affected 2c66daecc4092e6049673c281b2e6f0d5e59a94c 8d9d9bf3565271ca7ab9c716a94e87296177e7ba git Not specified
CNA Linux Linux affected 2c66daecc4092e6049673c281b2e6f0d5e59a94c cc024a3de265ef6c58957f4990eccb9f806208cb git Not specified
CNA Linux Linux affected 2c66daecc4092e6049673c281b2e6f0d5e59a94c 46ce8be2ced389bccd84bcc04a12cf2f4d0c22d1 git Not specified
CNA Linux Linux affected 3.13 Not specified
CNA Linux Linux unaffected 3.13 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0.1 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/20663102c14566e900e1d2f679e30b7f1694f387 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/46ce8be2ced389bccd84bcc04a12cf2f4d0c22d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5a59bf70c38ee1eb4be03bab830bbc3a6f0bd1f1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1bec5698b55aa2be5c3b983dba657c01d0fd3dbc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9ba6bb09e00b922d902f684f575779e5433fe6e3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2819f34e08bdffb6f06a51c67948ec5737fb166a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8d9d9bf3565271ca7ab9c716a94e87296177e7ba 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f83b399aa05a0712e3b1569a30d3d90b3533d2ef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cc024a3de265ef6c58957f4990eccb9f806208cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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