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CVE Record

CVE-2025-21735: NFC: nci: Add bounds checking in nci_hci_create_pipe()

In the Linux kernel, the following vulnerability has been resolved: NFC: nci: Add bounds checking in nci_hci_create_pipe() The "pipe" variable is a u8 which comes from the network. If it's more than 127, then it results in memory corruption in the caller, nci_hci_connect_gate().

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This Linux kernel NFC bug lets a network-supplied pipe value exceed the expected range, causing memory corruption in kernel NFC handling. The sources do not provide CVSS, public exploitation, or impact detail beyond memory corruption, so urgency depends on whether affected systems expose NFC/NCI functionality.

Executive priority

Treat as a targeted kernel update item, not a broad emergency from current evidence. Prioritize mobile, embedded, workstation, or industrial assets with NFC capability, and fold fixes into the next kernel maintenance cycle unless exposure is confirmed.

Technical view

CVE-2025-21735 is a bounds-checking flaw in nci_hci_create_pipe(). A u8 pipe value from the network greater than 127 can corrupt memory in nci_hci_connect_gate(). Kernel stable commits add validation across supported branches.

Likely exposure

Exposure is most likely on Linux systems with NFC/NCI kernel support enabled and reachable NFC-related communication paths. General servers without NFC hardware or enabled NFC stacks are likely lower exposure, but confirm kernel configuration and deployed versions.

Exploitation context

The bundle marks KEV as false and provides no cited evidence of active exploitation or public exploit tooling. The described primitive is memory corruption in kernel code, but practical exploitability is not established by the provided sources.

Researcher notes

The key condition is an attacker-controlled pipe value above 127 reaching nci_hci_create_pipe(). Sources identify memory corruption in nci_hci_connect_gate(), but do not state privilege impact, required proximity, authentication, or reliable exploitation details.

Mitigation direction

  • Apply vendor kernel updates containing the referenced stable fixes.
  • Prioritize devices where NFC/NCI support is enabled or physically reachable.
  • Review Debian LTS advisories if running affected Debian kernels.
  • Check Siemens guidance for listed industrial product exposure.
  • Disable unused NFC functionality where vendor-supported until patched.

Validation and detection

  • Inventory Linux kernel versions across endpoints, appliances, and embedded devices.
  • Check whether NFC/NCI kernel modules or drivers are enabled.
  • Map deployed kernels to vendor advisories and stable fix commits.
  • Confirm Debian LTS or other vendor kernel packages are updated.
  • Document systems where NFC is absent, disabled, or not reachable.
Prepared
Confidence
medium
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2025-21735 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
2ADP providers
12Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxa1b0b9415817c14d207921582f269d03f848b69f, a1b0b9415817c14d207921582f269d03f848b69f, a1b0b9415817c14d207921582f269d03f848b69f, a1b0b9415817c14d207921582f269d03f848b69f, a1b0b9415817c14d207921582f269d03f848b69f, a1b0b9415817c14d207921582f269d03f848b69f, a1b0b9415817c14d207921582f269d03f848b69f, a1b0b9415817c14d207921582f269d03f848b69funaffected
LinuxLinux4.4, 0, 5.4.291, 5.10.235, 5.15.179, 6.1.129, 6.6.78, 6.12.14, 6.13.3, 6.14affected
Weakness

CWE details

No CWE listed

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