CVE-2026-23432

Summary

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

mshv: Fix use-after-free in mshv_map_user_memory error path

In the error path of mshv_map_user_memory(), calling vfree() directly on the region leaves the MMU notifier registered. When userspace later unmaps the memory, the notifier fires and accesses the freed region, causing a use-after-free and potential kernel panic.

Replace vfree() with mshv_partition_put() to properly unregister the MMU notifier before freeing the region.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/34861bdc0c0196b6c2dd48f7454029407704ff6e
• https://git.kernel.org/stable/c/6922db250422a0dfee34de322f86b7a73d713d33

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