Medium · published July 24, 2026
In the Linux kernel, the following vulnerability has been resolved:
drivers/base/memory: set mem->altmap after successful device registration
If __add_memory_block() fails at xa_store() (under memory pressure for
example), device_unregister() is called, which eventually triggers
memory_block_release() with mem->altmap still set, causing a
WARN_ON(mem->altmap). This was triggered by modifying virtio-mem driver.
Fix this by delaying the assignment of mem->altmap until after
__add_memory_block() has succeeded.
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 6.6, < 6.6.144 | 6.6.144 |
| linux/linux_kernel | ≥ 6.7, < 6.12.95 | 6.12.95 |
| linux/linux_kernel | ≥ 6.13, < 6.18.37 | 6.18.37 |
| linux/linux_kernel | ≥ 6.19, < 7.0.14 | 7.0.14 |
| linux/linux_kernel | ≥ 7.1, < 7.1.2 | 7.1.2 |