CVE-2026-72138
xen/gntdev: fix error handling in ioctl
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ 68b025c813c2eb41ff25628e3d4952d5185eb1a4; < 52dc40ef0cfee6ae89b7524967e73f0ba37906d7 (affected, git) ≥ 68b025c813c2eb41ff25628e3d4952d5185eb1a4; < 1dd9cb98fe228e017fff9efb33862ff38c741b65 (affected, git) ≥ 68b025c813c2eb41ff25628e3d4952d5185eb1a4; < 6df926130aee6cab9b5d2e5b7862e49ccac348dc (affected, git) ≥ 68b025c813c2eb41ff25628e3d4952d5185eb1a4; < 311011f8cc206c5af2877b03e3f627ee1b8fe024 (affected, git) ≥ 68b025c813c2eb41ff25628e3d4952d5185eb1a4; < 18a693733f7ad004e1ab0466693121ca70cd95dd (affected, git) ≥ 68b025c813c2eb41ff25628e3d4952d5185eb1a4; < 16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454 (affected, git) ≥ 68b025c813c2eb41ff25628e3d4952d5185eb1a4; < 6883269a323609f68f6faa903f8f8ff3d191cec8 (affected, git) ≥ 68b025c813c2eb41ff25628e3d4952d5185eb1a4; < 45ca1afe2fd14c04e37227e79d3f8455831d8408 (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
2.6.39 (affected) ≥ 0; < 2.6.39 (unaffected, semver) ≥ 5.10.261; ≤ 5.10.* (unaffected, semver) ≥ 5.15.212; ≤ 5.15.* (unaffected, semver) ≥ 6.1.178; ≤ 6.1.* (unaffected, semver) ≥ 6.6.145; ≤ 6.6.* (unaffected, semver) ≥ 6.12.97; ≤ 6.12.* (unaffected, semver) ≥ 6.18.40; ≤ 6.18.* (unaffected, semver) ≥ 7.1.5; ≤ 7.1.* (unaffected, semver) ≥ 7.2; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/52dc40ef0cfee6ae89b7524967e73f0ba37906d7CNA: Linux
- https://git.kernel.org/stable/c/1dd9cb98fe228e017fff9efb33862ff38c741b65CNA: Linux
- https://git.kernel.org/stable/c/6df926130aee6cab9b5d2e5b7862e49ccac348dcCNA: Linux
- https://git.kernel.org/stable/c/311011f8cc206c5af2877b03e3f627ee1b8fe024CNA: Linux
- https://git.kernel.org/stable/c/18a693733f7ad004e1ab0466693121ca70cd95ddCNA: Linux
- https://git.kernel.org/stable/c/16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454CNA: Linux
- https://git.kernel.org/stable/c/6883269a323609f68f6faa903f8f8ff3d191cec8CNA: Linux
- https://git.kernel.org/stable/c/45ca1afe2fd14c04e37227e79d3f8455831d8408CNA: Linux
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