# CVE-2026-99199: Linux kernel hip04_eth null pointer dereference during probe

Source: https://junglewise.ai/threats/cve-2026-99199-in-the-linux-kernel-the-following-vulnerability-has-been-resolved  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-28. Updated: 2026-10-28  
License: CC BY 4.0 with a link back

CVE-2026-99199 · Severity: info · Published 2026-10-28

The Hisilicon HIP04 Ethernet driver in the Linux kernel crashes during device initialization when CONFIG_NET_SHAPER is enabled. The driver fails to initialize network operations before attempting to attach a physical layer device, causing a null pointer exception that prevents the network interface from being brought online, effectively rendering the network port non-functional.

Technologies: [Linux kernel](https://junglewise.ai/threats/technologies/x-linux-kernel).

## Quick answers

**Is CVE-2026-99199 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-99199 being exploited in the wild.

**How severe is CVE-2026-99199?** Informational severity, published 28 October 2026.

**Which products and versions are affected?** Linux kernel affected versions when CONFIG_NET_SHAPER is enabled.

**Is there a fix for CVE-2026-99199?** A patch was published on 2026-10-15. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-99199 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-99199?** Check whether you run Linux kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The hip04_mac_probe() function calls of_phy_connect() before assigning ndev->netdev_ops, but phy_attach_direct() now reads netdev_ops through netdev_need_ops_lock() (since a related networking change), resulting in a null pointer dereference when CONFIG_NET_SHAPER is enabled. The fix reorders the initialization to assign netdev_ops before the PHY attachment, ensuring the operation structure is available when accessed.

## Affected products

- Linux kernel affected versions when CONFIG_NET_SHAPER is enabled

## Timeline

- 2026-10-28: disclosed
- 2026-10-15: patched

## References

- [https://git.kernel.org/stable/c/0d9342701f14ec0a9465772b7cd5d515c1ecd818](https://git.kernel.org/stable/c/0d9342701f14ec0a9465772b7cd5d515c1ecd818)
- [https://git.kernel.org/stable/c/1c2f9c3a63baabfb965a23a00f026f3ddcaadb24](https://git.kernel.org/stable/c/1c2f9c3a63baabfb965a23a00f026f3ddcaadb24)

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