CVE-2026-72138xen/gntdev: fix error handling in ioctl
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 68b025c813c2eb41ff25628e3d4952d5185eb1a4 builds before 52dc40ef0cfee6ae89b7524967e73f0ba37906d7; 68b025c813c2eb41ff25628e3d4952d5185eb1a4 builds before 1dd9cb98fe228e017fff9efb33862ff38c741b65; 68b025c813c2eb41ff25628e3d4952d5185eb1a4 builds before 6df926130aee6cab9b5d2e5b7862e49ccac348dc; from 68b025c813c2eb41ff25628e3d4952d5185eb1a4 before 311011f8cc206c5af2877b03e3f627ee1b8fe024; 68b025c813c2eb41ff25628e3d4952d5185eb1a4 builds before 18a693733f7ad004e1ab0466693121ca70cd95dd; 68b025c813c2eb41ff25628e3d4952d5185eb1a4 builds before 16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454; from 68b025c813c2eb41ff25628e3d4952d5185eb1a4 before 6883269a323609f68f6faa903f8f8ff3d191cec8; 68b025c813c2eb41ff25628e3d4952d5185eb1a4 builds before 45ca1afe2fd14c04e37227e79d3f8455831d8408 | CNA record |
References
- https://git.kernel.org/stable/c/52dc40ef0cfee6ae89b7524967e73f0ba37906d7
- https://git.kernel.org/stable/c/1dd9cb98fe228e017fff9efb33862ff38c741b65
- https://git.kernel.org/stable/c/6df926130aee6cab9b5d2e5b7862e49ccac348dc
- https://git.kernel.org/stable/c/311011f8cc206c5af2877b03e3f627ee1b8fe024
- https://git.kernel.org/stable/c/18a693733f7ad004e1ab0466693121ca70cd95dd
- https://git.kernel.org/stable/c/16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454
- https://git.kernel.org/stable/c/6883269a323609f68f6faa903f8f8ff3d191cec8
- https://git.kernel.org/stable/c/45ca1afe2fd14c04e37227e79d3f8455831d8408
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.