CVE-2026-98481 - Vulnerability Details

- nfc: port100: reject frames whose declared length exceeds the received data

Description

In the Linux kernel, the following vulnerability has been resolved:

nfc: port100: reject frames whose declared length exceeds the received data

port100_recv_response() passes the URB transfer buffer to
port100_rx_frame_is_valid(), which checksums le16_to_cpu(frame->datalen)
bytes of frame->data. datalen is a 16-bit field supplied by the device
and is never checked against the number of bytes actually received
(urb->actual_length), so a device reporting a datalen larger than the
received frame makes port100_data_checksum() read out of bounds past the
transfer buffer.

Reject a response whose declared frame size does not fit the received
length before validating it.

Found by 0sec (https://0sec.ai) using automated source analysis; the
missing bound is evident from source. Compile-tested.

Published: 2026-10-18

Score: 6.2 Medium

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

In the Linux kernel NFC port100 driver, a frame received event passes the raw USB Request Block (URB) buffer to a checksum routine without first verifying that the frame’s declared length field is no larger than the actual transfer length. The 16‑bit datalen value is supplied by the device and is not checked against urb->actual_length, allowing a device that reports a datalen larger than the received data to cause the checksum routine to read beyond the end of the buffer. This out‑of‑bounds read could expose kernel memory contents to a local user or lead to a kernel fault or crash. This is a classic out‑of‑bounds read vulnerability (CWE‑125).

Affected Systems

All Linux kernel systems that enable the NFC port100 interface, which includes any NFC controller connected via USB that uses the port100 driver. Users running any version of the Linux kernel with this driver enabled are potentially affected.

Risk and Exploitability

With a CVSS score of 6.2, this vulnerability is considered medium severity. Its EPSS score of less than 1% indicates a very low but nonzero probability of exploitation. The vulnerability is not listed in CISA’s KEV catalog. Based on the description, the primary risk is that an NFC device could deliver a frame whose datalen field is larger than the actual payload, causing the checksum routine to read beyond the end of the buffer. This out‑of‑bounds read could expose sensitive kernel memory to a local attacker or trigger a kernel crash, potentially leading to denial of service or subsequent privilege escalation. The attack requires a malicious device connected to the port100 interface, so the impact is limited to systems with that driver enabled and a local device.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06`	affected	< 0d482995f0cdd0302450aa300c684c642d8ab31f
`562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06`	affected	< 9e8df087826b9999d1b83b06f5d85675d5a69c9e
`562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06`	affected	< db66a30588630c7de30ef033f00daddef69f6ad9
`562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06`	affected	< 144ad477c381e2c592b64898d04ab4ce03b32861
`562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06`	affected	< e4da1452e10c6472a4bac48dc2f6a35fff1fcd69
`562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06`	affected	< 14b1467cfc6630583650f33538174c5a1ec685ab
`562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06`	affected	< 035056e07ea65be670284246d9bc62f2f00ff4a3
`562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06`	affected	< 092c6a605cbd6414ef499834c2e0da69c2c3388e

Linux

affected

Version	Status	Constraints
`3.13`	affected	—
`0`	unaffected	< 3.13
`5.10.271`	unaffected	≤ 5.10.*
`5.15.222`	unaffected	≤ 5.15.*
`6.1.189`	unaffected	≤ 6.1.*
`6.6.158`	unaffected	≤ 6.6.*
`6.12.112`	unaffected	≤ 6.12.*
`6.18.55`	unaffected	≤ 6.18.*
`7.2.9`	unaffected	≤ 7.2.*
`7.3`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06,0d482995f0cdd0302450aa300c684c642d8ab31f)`	affected	code_commit	—
`[562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06,9e8df087826b9999d1b83b06f5d85675d5a69c9e)`	affected	code_commit	—
`[562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06,db66a30588630c7de30ef033f00daddef69f6ad9)`	affected	code_commit	—
`[562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06,144ad477c381e2c592b64898d04ab4ce03b32861)`	affected	code_commit	—
`[562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06,e4da1452e10c6472a4bac48dc2f6a35fff1fcd69)`	affected	code_commit	—
`[562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06,14b1467cfc6630583650f33538174c5a1ec685ab)`	affected	code_commit	—
`[562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06,035056e07ea65be670284246d9bc62f2f00ff4a3)`	affected	code_commit	—
`[562d4d59b8a1d5f3ca75115d6ac10c7b7bc68c06,092c6a605cbd6414ef499834c2e0da69c2c3388e)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`3.13`	affected	generic	—
`[0,3.13)`	unaffected	generic	—
`[5.10.271,6.0.0)`	unaffected	semver	—
`[5.15.222,6.0.0)`	unaffected	semver	—
`[6.1.189,7.0.0)`	unaffected	semver	—
`[6.6.158,7.0.0)`	unaffected	semver	—
`[6.12.112,7.0.0)`	unaffected	semver	—
`[6.18.55,7.0.0)`	unaffected	semver	—
`[7.2.9,8.0.0)`	unaffected	semver	—
`[7.3-rc5,*]`	unaffected	generic	—

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Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Apply the patched Linux kernel when it becomes available in the vendor’s distribution channels
Update the NFC controller firmware or device driver to ensure it does not report frame lengths larger than the data actually transmitted
If a patch is not yet available, consider disabling the port100 NFC interface or adding a local kernel module that validates datalen against urb->actual_length before checksum calculation

Generated by OpenCVE AI on October 22, 2026 at 22:38 UTC.

Tracking

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Advisories

Source	ID	Title
Debian DLA	DLA-4850-1	linux-6.12 security update
Ubuntu USN	USN-8961-1	Linux kernel vulnerabilities

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00216.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98481.mbox
https://git.kernel.org/stable/c/035056e07ea65be670284246d9bc62f2f00ff4a3
https://git.kernel.org/stable/c/092c6a605cbd6414ef499834c2e0da69c2c3388e
https://git.kernel.org/stable/c/0d482995f0cdd0302450aa300c684c642d8ab31f
https://git.kernel.org/stable/c/144ad477c381e2c592b64898d04ab4ce03b32861
https://git.kernel.org/stable/c/14b1467cfc6630583650f33538174c5a1ec685ab
https://git.kernel.org/stable/c/9e8df087826b9999d1b83b06f5d85675d5a69c9e
https://git.kernel.org/stable/c/db66a30588630c7de30ef033f00daddef69f6ad9
https://git.kernel.org/stable/c/e4da1452e10c6472a4bac48dc2f6a35fff1fcd69
https://nvd.nist.gov/vuln/detail/CVE-2026-98481
https://www.cve.org/CVERecord?id=CVE-2026-98481

History

Wed, 21 Oct 2026 00:30:00 +0000

Type	Values Removed	Values Added
References		https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98481.mbox https://nvd.nist.gov/vuln/detail/CVE-2026-98481 https://www.cve.org/CVERecord?id=CVE-2026-98481
Metrics	threat_severity `None`	cvssV3_1 `{'score': 6.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}` threat_severity `Moderate`

Mon, 19 Oct 2026 00:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-125

Sun, 18 Oct 2026 15:30:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: nfc: port100: reject frames whose declared length exceeds the received data port100_recv_response() passes the URB transfer buffer to port100_rx_frame_is_valid(), which checksums le16_to_cpu(frame->datalen) bytes of frame->data. datalen is a 16-bit field supplied by the device and is never checked against the number of bytes actually received (urb->actual_length), so a device reporting a datalen larger than the received frame makes port100_data_checksum() read out of bounds past the transfer buffer. Reject a response whose declared frame size does not fit the received length before validating it. Found by 0sec (https://0sec.ai) using automated source analysis; the missing bound is evident from source. Compile-tested.
Title		nfc: port100: reject frames whose declared length exceeds the received data
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/035056e07ea65be670284246d9bc62f2f00ff4a3 https://git.kernel.org/stable/c/092c6a605cbd6414ef499834c2e0da69c2c3388e https://git.kernel.org/stable/c/0d482995f0cdd0302450aa300c684c642d8ab31f https://git.kernel.org/stable/c/144ad477c381e2c592b64898d04ab4ce03b32861 https://git.kernel.org/stable/c/14b1467cfc6630583650f33538174c5a1ec685ab https://git.kernel.org/stable/c/9e8df087826b9999d1b83b06f5d85675d5a69c9e https://git.kernel.org/stable/c/db66a30588630c7de30ef033f00daddef69f6ad9 https://git.kernel.org/stable/c/e4da1452e10c6472a4bac48dc2f6a35fff1fcd69

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-10-18T15:15:55.360Z

Updated: 2026-10-19T09:20:18.735Z

Reserved: 2026-09-25T10:25:14.352Z

Link: CVE-2026-98481

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-10-18T16:16:58.697

Modified: 2026-10-19T10:18:59.333

Link: CVE-2026-98481

Redhat

Severity : Moderate

Publid Date: 2026-10-18T00:00:00Z

Links: CVE-2026-98481 - Bugzilla

OpenCVE Enrichment

Updated: 2026-10-22T22:45:13Z

Weaknesses

CWE-125
Out-of-bounds Read

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Subscriptions

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