CVE-2026-72138None▾ SunlitIn 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…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= 68b025c813c2eb41ff25628e3d4952d5185eb1a4 < 52dc40ef0cfee6ae89b7524967e73f0ba37906d7Linux >= 68b025c813c2eb41ff25628e3d4952d5185eb1a4 < 1dd9cb98fe228e017fff9efb33862ff38c741b65Linux >= 68b025c813c2eb41ff25628e3d4952d5185eb1a4 < 6df926130aee6cab9b5d2e5b7862e49ccac348dcLinux >= 68b025c813c2eb41ff25628e3d4952d5185eb1a4 < 311011f8cc206c5af2877b03e3f627ee1b8fe024Linux >= 68b025c813c2eb41ff25628e3d4952d5185eb1a4 < 18a693733f7ad004e1ab0466693121ca70cd95ddLinux >= 68b025c813c2eb41ff25628e3d4952d5185eb1a4 < 16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454Linux >= 68b025c813c2eb41ff25628e3d4952d5185eb1a4 < 6883269a323609f68f6faa903f8f8ff3d191cec8Linux >= 68b025c813c2eb41ff25628e3d4952d5185eb1a4 < 45ca1afe2fd14c04e37227e79d3f8455831d8408Linux 2.6.39Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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