What’s Vulnerable › Vulnerabilities

CVE-2026-99045: ibmveth: h_free logical LAN on open-fail after register

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-23 · updated 2026-10-30

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.

Affected products

• Linux: 4.13 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

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

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