CVE-2026-63915

System crash via zero-byte NFC HCP frame

Published Jul 19, 2026 · Updated Jul 19, 2026

Out-of-bounds read in affected Linux Kernel releases allows physically proximate attackers to crash a system via a zero-byte HCP frame. The two receive callbacks dereference packet->header before confirming that skb->data contains one byte, while non-final fragments can underflow msg_len before reassembly writes. Exploitation requires NFC hardware and proximity to send the crafted peer frame; the bounded operational result is an skb_over_panic kernel crash.

CVSS severity8.8
High
EPSS probability0.35%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in affected Linux Kernel releases allows physically proximate attackers to crash a system via a zero-byte HCP frame. The two receive callbacks dereference packet->header before confirming that skb->data contains one byte, while non-final fragments can underflow msg_len before reassembly writes. Exploitation requires NFC hardware and proximity to send the crafted peer frame; the bounded operational result is an skb_over_panic kernel crash.

The record

CVE
CVE-2026-63915
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.5
  2. Affected versionversion=8b8d2e08bf0d50193931afd27482a59376b66b2b <1905f5ec3641b2b234bb63549c8ca11ab85466eb
  3. Affected versionversion=8b8d2e08bf0d50193931afd27482a59376b66b2b <22d41b176b9989efd21c3b2d3abf6728f05b9d9a
  4. Affected versionversion=8b8d2e08bf0d50193931afd27482a59376b66b2b <37382293f174b82a0616c8295e32b1fc8e13d1ed
  5. Affected versionversion=8b8d2e08bf0d50193931afd27482a59376b66b2b <83b1362edc9d6ae376c6f36da116e2c70f2e70a6
  6. Affected versionversion=8b8d2e08bf0d50193931afd27482a59376b66b2b <b99366d74b535d0cadb1ef73e04639415d9ff3b7
  7. Affected versionversion=8b8d2e08bf0d50193931afd27482a59376b66b2b <c4cc6b3b0013acb3ed0b2b60e57dfae98647fe98
  8. Affected versionversion=8b8d2e08bf0d50193931afd27482a59376b66b2b <ed6d5d97dad0334a7f43d218753429cbe2f70a4f
  9. Affected versionversion=8b8d2e08bf0d50193931afd27482a59376b66b2b <f040e590c035bfd9553fe79ee9585caf1b14d67b

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.5; version=8b8d2e08bf0d50193931afd27482a59376b66b2b <1905f5ec3641b2b234bb63549c8ca11ab85466eb; version=8b8d2e08bf0d50193931afd27482a59376b66b2b <22d41b176b9989efd21c3b2d3abf6728f05b9d9a; version=8b8d2e08bf0d50193931afd27482a59376b66b2b <37382293f174b82a0616c8295e32b1fc8e13d1ed; version=8b8d2e08bf0d50193931afd27482a59376b66b2b <83b1362edc9d6ae376c6f36da116e2c70f2e70a6; version=8b8d2e08bf0d50193931afd27482a59376b66b2b <b99366d74b535d0cadb1ef73e04639415d9ff3b7; version=8b8d2e08bf0d50193931afd27482a59376b66b2b <c4cc6b3b0013acb3ed0b2b60e57dfae98647fe98; version=8b8d2e08bf0d50193931afd27482a59376b66b2b <ed6d5d97dad0334a7f43d218753429cbe2f70a4f; version=8b8d2e08bf0d50193931afd27482a59376b66b2b <f040e590c035bfd9553fe79ee9585caf1b14d67b

Published CVSS scores

8.8kernel.orgCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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