Out-of-bounds write in ADIN2111/ADIN1110 OA SPI Ethernet RX frame reassembly (CVE-2026-10673)
Published Last modified Sources: CVE.org
What is affected, what to do
The Zephyr ADIN2111/ADIN1110 10BASE-T1S/T1L Ethernet driver (drivers/ethernet/eth_adin2111.c) reassembles received Ethernet frames in OPEN Alliance (OA) SPI mode by copying device-supplied 64-byte data chunks into a fixed static buffer ctx->buf of size CONFIG_ETH_ADIN2111_BUFFER_SIZE (default 1524 bytes). In eth_adin2111_oa_data_read(), each valid chunk was memcpy'd into ctx->buf[ctx->scur] and the write cursor scur advanced, with no check that scur + len stayed within the buffer.
An exploit is publicly available. Update Zephyrproject Zephyr to version 4.3.1, Zephyrproject Zephyr to version 4.4.1.
- Affected
- Zephyrproject Zephyr
lt 3.7.0..4.3.1 - Zephyrproject Zephyr
lt 4.4.0..4.4.1
- Zephyrproject Zephyr
- Fixed in
- Zephyrproject Zephyr
4.3.1 - Zephyrproject Zephyr
4.4.1
- Zephyrproject Zephyr
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Metrics
8.8
Priority
XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.
Source: NVD, CVSS v3
8.8
CVSS v3
Severity High on the scale from 0 to 10.
Source: CVE.org
0.4 %
EPSS score
Low — model estimates < 1% exploitation likelihood.
Source: FIRST EPSS, percentile 35.9
Show all metrics
- Severity
- High
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 74.82 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- PoC (publicly reported)
XIEM Effective CVSS
XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.
Read in glossary- 8.8 Methodology
CVSS v3
CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.
Read in glossary- 8.8
EPSS score
The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.
Read in glossary- 0.4 %
- Low — model estimates < 1% exploitation likelihood.
EPSS percentile
The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.
Read in glossary- 35.9
- Elevated — this CVE ranks above at least 10% of all CVEs scored today.
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
- CISA assessment (SSVC)
- Exploitation: proof of concept · not automatable · Technical impact: partial
- Source: CISA Vulnrichment, as of 15 July 2026
CWE
CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.
Read in glossary- CWE-125, CWE-787, CWE-787
Detection rules
No NEOSEC detection rule is available for this vulnerability yet.
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
The Zephyr ADIN2111/ADIN1110 10BASE-T1S/T1L Ethernet driver (drivers/ethernet/eth_adin2111.c) reassembles received Ethernet frames in OPEN Alliance (OA) SPI mode by copying device-supplied 64-byte data chunks into a fixed static buffer ctx->buf of size CONFIG_ETH_ADIN2111_BUFFER_SIZE (default 1524 bytes). In eth_adin2111_oa_data_read(), each valid chunk was memcpy'd into ctx->buf[ctx->scur] and the write cursor scur advanced, with no check that scur + len stayed within the buffer. The number of chunks (up to 255, from the BUFSTS RCA field) and the per-chunk length are taken entirely from the frame data received off the wire; the cursor is only reset on a start-of-frame chunk. An attacker on the single-pair Ethernet segment can therefore send a frame whose reassembled size exceeds the configured buffer, causing the driver's RX offload thread to write attacker-controlled frame bytes past the end of the static buffer into adjacent driver/kernel memory (up to roughly 14.8 KB in the worst case). This is a remotely/adjacently reachable out-of-bounds write (CWE-787) that can corrupt memory and cause denial of service or potentially code execution. The defect was introduced when OA SPI support was added (commit 0ca8b0756b1) and shipped in releases v3.7.0 through v4.4.0. The fix adds a bounds check that drops the oversized frame and resets the cursor before the copy.
Source: NVD (NIST), cvelistv5
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| zephyrproject | zephyr |
|
|
Vendors and products
Affected operating systems
| Other | zephyrproject | zephyr | — |
Weakness classes (CWE)
CWE-125Out-of-bounds Read
Base
The product reads data past the end, or before the beginning, of the intended buffer.
Entry at MITRE CWE-125CWE-787Out-of-bounds Write
Base
The product writes data past the end, or before the beginning, of the intended buffer.
Entry at MITRE CWE-787CWE-787Out-of-bounds Write
Base
The product writes data past the end, or before the beginning, of the intended buffer.
Entry at MITRE CWE-787
Public exploit references
Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.
| Reference tagged as exploit | github.com (opens in a new tab) | PoC (publicly reported)reported, not verified | — |
References & sources
- github.comFix commit 158df8d08831Patch, Patch
- github.comFix commit c98321cbfef2Patch, Patch
- github.comGHSA-hm6v-4jh4-3qc4Exploit, Patch, Vendor advisory
Changes to this CVE
Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).
Record modifiedCISA ADP
Show 3 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hm6v-4jh4-3qc4Reference removed https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hm6v-4jh4-3qc4—Reference type removed https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hm6v-4jh4-3qc4 Types: Exploit, Patch, Vendor Advisory—Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Record modifiedzephyrproject.org
Show 10 original changes
Individual changes of this event as published by NVD Type Action Before After Affected versions (publisher) added —Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/10xxx/CVE-2026-10673.json">CVE-2026-10673</a>Reference added —https://github.com/zephyrproject-rtos/zephyr/commit/158df8d088316cdae20816fc07703892280b2acbReference added —https://github.com/zephyrproject-rtos/zephyr/commit/c98321cbfef23c0e3bdf043ccf6b421067c8d508Reference added —https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hm6v-4jh4-3qc4Reference removed https://github.com/zephyrproject-rtos/zephyr/commit/158df8d088316cdae20816fc07703892280b2acb—Reference removed https://github.com/zephyrproject-rtos/zephyr/commit/c98321cbfef23c0e3bdf043ccf6b421067c8d508—Reference removed https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hm6v-4jh4-3qc4—Reference type removed https://github.com/zephyrproject-rtos/zephyr/commit/158df8d088316cdae20816fc07703892280b2acb Types: Patch—Reference type removed https://github.com/zephyrproject-rtos/zephyr/commit/c98321cbfef23c0e3bdf043ccf6b421067c8d508 Types: Patch—Reference type removed https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hm6v-4jh4-3qc4 Types: Exploit, Patch, Vendor Advisory—Source identifier: vulnerabilities@zephyrproject.org
Receivedzephyrproject.org
CVSS V3.1: AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
Weakness type: CWE-125, CWE-787
Description added or changed
Show 8 original changes
Individual changes of this event as published by NVD Type Action Before After Affected versions (publisher) added —zephyrDescription added —The Zephyr ADIN2111/ADIN1110 10BASE-T1S/T1L Ethernet driver (drivers/ethernet/eth_adin2111.c) reassembles received Ethernet frames in OPEN Alliance (OA) SPI mode by copying device-supplied 64-byte data chunks into a fixed static buffer ctx->buf of size CONFIG_ETH_ADIN2111_BUFFER_SIZE (default 1524 bytes). In eth_adin2111_oa_data_read(), each valid chunk was memcpy'd into ctx->buf[ctx->scur] and the write cursor scur advanced, with no check that scur + len stayed within the buffer. The number of chunks (up to 255, from the BUFSTS RCA field) and the per-chunk length are taken entirely from the frame data received off the wire; the cursor is only reset on a start-of-frame chunk. An attacker on the single-pair Ethernet segment can therefore send a frame whose reassembled size exceeds the configured buffer, causing the driver's RX offload thread to write attacker-controlled frame bytes past the end of the static buffer into adjacent driver/kernel memory (up to roughly 14.8 KB in the worst case). This is a remotely/adjacently reachable out-of-bounds write (CWE-787) that can corrupt memory and cause denial of service or potentially code execution. The defect was introduced when OA SPI support was added (commit 0ca8b0756b1) and shipped in releases v3.7.0 through v4.4.0. The fix adds a bounds check that drops the oversized frame and resets the cursor before the copy.CVSS added —AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:HWeakness type (CWE) added —CWE-125Weakness type (CWE) added —CWE-787Reference added —https://github.com/zephyrproject-rtos/zephyr/commit/158df8d088316cdae20816fc07703892280b2acbReference added —https://github.com/zephyrproject-rtos/zephyr/commit/c98321cbfef23c0e3bdf043ccf6b421067c8d508Reference added —https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-hm6v-4jh4-3qc4Source identifier: vulnerabilities@zephyrproject.org
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<a href="https://intel.neosec.eu/en/cve/CVE-2026-10673"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-10673.svg?lang=en" alt="CVE-2026-10673 – NEOSEC Intel" height="20"></a>