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CVE-2026-43291: net: nfc: nci: Fix parameter validation for packet data

• Severity: high (CVSS 8.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-08 · updated 2026-06-17
• Weakness: CWE-908

Description

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).

Affected products

• Linux kernel: from 5.15.195 before 5.15.202; from 6.1.156 before 6.1.165; from 6.6.112 before 6.6.128; from 6.12.53 before 6.12.75; from 6.17.3 before 6.18; from 6.18 before 6.18.16 — fixed in 5.15.202, 6.1.165, 6.12.75, 6.18, 6.18.16, 6.19.6

How to fix

Upgrade to a fixed version: Linux kernel 5.15.202, 6.1.165, 6.12.75, 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3b91160e9a91b5a2662875417dc42dc5b0bf03ea
• https://git.kernel.org/stable/c/498fc5d0d650c77e87fcc73808d4f43240c21805
• https://git.kernel.org/stable/c/571dcbeb8e635182bb825ae758399831805693c2
• https://git.kernel.org/stable/c/a24a8a582da4426b2042e510a1080df84083b51d
• https://git.kernel.org/stable/c/ad058a4317db7fdb3f09caa6ed536d24a62ce6a0
• https://git.kernel.org/stable/c/c692db813a7e3b7c3c17d6e9a3ad2a018bf1142b
• https://git.kernel.org/stable/c/f5218426f765eee22e178df9c126d974792fb6a5

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