nfc: hci: fix out-of-bounds read in HCP header parsing

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63915
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:09 UTC
Updated2026-07-20 15:16:55 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nfc: hci: fix out-of-bounds read in HCP header parsing Both nfc_hci_recv_from_llc() and nci_hci_data_received_cb() read packet->header from skb->data at function entry without first checking that the buffer holds at least one byte. A malicious NFC peer can send a 0-byte HCP frame that passes through the SHDLC layer and reaches these functions, causing an out-of-bounds heap read of packet->header. The same 0-byte frame, if queued as a non-final fragment, also causes the reassembly loop to underflow msg_len to UINT_MAX, triggering skb_over_panic() when the reassembled skb is written. Fix this by adding a pskb_may_pull() check at the entry of each function before packet->header is first accessed. The existing pskb_may_pull() checks before the reassembled hcp_skb is cast to struct hcp_packet remain in place to guard the 2-byte HCP message header.

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: 0.002100000 probability, percentile 0.113620000 (date 2026-07-20)

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8b8d2e08bf0d50193931afd27482a59376b66b2b ed6d5d97dad0334a7f43d218753429cbe2f70a4f git Not specified
CNA Linux Linux affected 8b8d2e08bf0d50193931afd27482a59376b66b2b b99366d74b535d0cadb1ef73e04639415d9ff3b7 git Not specified
CNA Linux Linux affected 8b8d2e08bf0d50193931afd27482a59376b66b2b 37382293f174b82a0616c8295e32b1fc8e13d1ed git Not specified
CNA Linux Linux affected 8b8d2e08bf0d50193931afd27482a59376b66b2b c4cc6b3b0013acb3ed0b2b60e57dfae98647fe98 git Not specified
CNA Linux Linux affected 8b8d2e08bf0d50193931afd27482a59376b66b2b 1905f5ec3641b2b234bb63549c8ca11ab85466eb git Not specified
CNA Linux Linux affected 8b8d2e08bf0d50193931afd27482a59376b66b2b 22d41b176b9989efd21c3b2d3abf6728f05b9d9a git Not specified
CNA Linux Linux affected 8b8d2e08bf0d50193931afd27482a59376b66b2b 83b1362edc9d6ae376c6f36da116e2c70f2e70a6 git Not specified
CNA Linux Linux affected 8b8d2e08bf0d50193931afd27482a59376b66b2b f040e590c035bfd9553fe79ee9585caf1b14d67b git Not specified
CNA Linux Linux affected 3.5 Not specified
CNA Linux Linux unaffected 3.5 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.93 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.35 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.12 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f040e590c035bfd9553fe79ee9585caf1b14d67b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b99366d74b535d0cadb1ef73e04639415d9ff3b7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/37382293f174b82a0616c8295e32b1fc8e13d1ed 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/83b1362edc9d6ae376c6f36da116e2c70f2e70a6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1905f5ec3641b2b234bb63549c8ca11ab85466eb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c4cc6b3b0013acb3ed0b2b60e57dfae98647fe98 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/22d41b176b9989efd21c3b2d3abf6728f05b9d9a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ed6d5d97dad0334a7f43d218753429cbe2f70a4f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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