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.

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454 cve-icon cve-icon
https://git.kernel.org/stable/c/18a693733f7ad004e1ab0466693121ca70cd95dd cve-icon cve-icon
https://git.kernel.org/stable/c/1dd9cb98fe228e017fff9efb33862ff38c741b65 cve-icon cve-icon
https://git.kernel.org/stable/c/311011f8cc206c5af2877b03e3f627ee1b8fe024 cve-icon cve-icon
https://git.kernel.org/stable/c/45ca1afe2fd14c04e37227e79d3f8455831d8408 cve-icon cve-icon
https://git.kernel.org/stable/c/52dc40ef0cfee6ae89b7524967e73f0ba37906d7 cve-icon cve-icon
https://git.kernel.org/stable/c/6883269a323609f68f6faa903f8f8ff3d191cec8 cve-icon cve-icon
https://git.kernel.org/stable/c/6df926130aee6cab9b5d2e5b7862e49ccac348dc cve-icon cve-icon
History

Sat, 15 Aug 2026 06:00:00 +0000

Type Values Removed Values Added
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.
Title xen/gntdev: fix error handling in ioctl
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-15T05:53:12.549Z

Reserved: 2026-08-09T03:40:39.908Z

Link: CVE-2026-72138

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-15T06:21:31.337

Modified: 2026-08-15T06:21:31.337

Link: CVE-2026-72138

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.