CVE-2026-99287

In the Linux kernel, the following vulnerability has been resolved:

xen-netback: Zero out sring pointers on unmap

If xenvif map frontend data rings() fails when a ring is already mapped, it unmaps them via xenvif unmap frontend data rings() which keeps the ring pointers unchanged. xenvif connect data()'s cleanup path calls xenvif disconnect queue() which in turn calls xenvif unmap frontend data rings() again, which will attempt to unmap the pointers a second time.

Zero out the ring pointers after they are unmapped to avoid this issue.

This is XSA-532