CVE-2026-72138
Description
In the Linux kernel, the following vulnerability has been resolved: xen/gntdev: fix error handling in ioctl When gntdev_ioctl_map_grant_ref() fails to copy the operation result back to userspace after successfully adding the mapping to the list, the error path returns -EFAULT without releasing the reference acquired by gntdev_alloc_map(). The mapping remains in priv->maps with a refcount of 1, causing a memory leak and a dangling list entry. Additionally, gntdev_add_map() may modify map->index to avoid overlap with existing mappings. Therefore, the index returned to userspace must be obtained after gntdev_add_map() completes. Fix this by holding the mutex across gntdev_add_map(), retrieving the correct index, and copy_to_user(). If copy_to_user() fails, remove the mapping from the list and release the reference while still holding the lock. Fix these issues by properly handling all error cases.
How to fix
- Linux Linux52dc40ef0cfee6ae89b7524967e73f0ba37906d7, 1dd9cb98fe228e017fff9efb33862ff38c741b65, 6df926130aee6cab9b5d2e5b7862e49ccac348dc, 311011f8cc206c5af2877b03e3f627ee1b8fe024, 18a693733f7ad004e1ab0466693121ca70cd95dd, 16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454, 6883269a323609f68f6faa903f8f8ff3d191cec8, 45ca1afe2fd14c04e37227e79d3f8455831d8408 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 68b025c813c2eb41ff25628e3d4952d5185eb1a4 ≤ v < 52dc40ef0cfee6ae89b7524967e73f0ba37906d7, 68b025c813c2eb41ff25628e3d4952d5185eb1a4 ≤ v < 1dd9cb98fe228e017fff9efb33862ff38c741b65, 68b025c813c2eb41ff25628e3d4952d5185eb1a4 ≤ v < 6df926130aee6cab9b5d2e5b7862e49ccac348dc, 68b025c813c2eb41ff25628e3d4952d5185eb1a4 ≤ v < 311011f8cc206c5af2877b03e3f627ee1b8fe024, 68b025c813c2eb41ff25628e3d4952d5185eb1a4 ≤ v < 18a693733f7ad004e1ab0466693121ca70cd95dd, 68b025c813c2eb41ff25628e3d4952d5185eb1a4 ≤ v < 16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454, 68b025c813c2eb41ff25628e3d4952d5185eb1a4 ≤ v < 6883269a323609f68f6faa903f8f8ff3d191cec8, 68b025c813c2eb41ff25628e3d4952d5185eb1a4 ≤ v < 45ca1afe2fd14c04e37227e79d3f8455831d8408, 2.6.39 | 52dc40ef0cfee6ae89b7524967e73f0ba37906d7, 1dd9cb98fe228e017fff9efb33862ff38c741b65, 6df926130aee6cab9b5d2e5b7862e49ccac348dc, 311011f8cc206c5af2877b03e3f627ee1b8fe024, 18a693733f7ad004e1ab0466693121ca70cd95dd, 16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454, 6883269a323609f68f6faa903f8f8ff3d191cec8, 45ca1afe2fd14c04e37227e79d3f8455831d8408 |
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