CVE-2026-43291

High

In the Linux kernel, the following vulnerability has been resolved: net: nfc: nci: Fix parameter validation for packet data Since commit 9c328f54741b ("net: nfc: nci: Add parameter validation for packet data") communication with nci nfc chips is not working any more. The mentioned commit tries to fix access of uninitialized data, but failed to understand that in some cases the data packet is of variable length and can therefore not be compared to the maximum packet length given by the sizeof(struct).

Package Linux Kernel
Published 2026-05-08
Last modified 2026-05-14
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

8.3

out of 10
High
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
High
Vector string
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H

Weakness type

CWE-908

CVE-2026-43291 is classified as CWE-908

See CWE-908 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 5.15.195, 6.1.156, 6.6.112, 6.12.53, 6.17.3, 6.18 and later are affected. Fixed in 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.16, 6.19.6, 7.0 and their respective stable series.

Affected from
≥ 5.15.195 ≥ 6.1.156 ≥ 6.6.112 ≥ 6.12.53 ≥ 6.17.3 ≥ 6.18
Fixed in
✓ 5.15.202 5.15.x ✓ 6.1.165 6.1.x ✓ 6.6.128 6.6.x ✓ 6.12.75 6.12.x ✓ 6.18.16 6.18.x ✓ 6.19.6 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-43291 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

7 patch commits total View all on NVD

Frequently asked questions

  • What is CVE-2026-43291?

    CVE-2026-43291 is a High severity Linux kernel vulnerability with a CVSS score of 8.3 out of 10 . It affects Linux kernel versions from 5.15.195 onward and has been patched in 5.15.202, 6.1.165, 6.6.128 and others. CVE-2026-43291 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2026-43291?

    CVE-2026-43291 has a CVSS score of 8.3 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H .

  • Is there a patch available for CVE-2026-43291?

    Yes — CVE-2026-43291 has been patched. Fixed versions include 5.15.202, 6.1.165, 6.6.128 and others. If you are running Linux kernel 5.15.195 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2026-43291 actively exploited?

    No — CVE-2026-43291 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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