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CVE-2026-72138

UnknownEPSS 0.21%

Last modified

CVE-2026-72138 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
0.21%

11.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 68b025c813c2eb41ff25628e3d4952d5185eb1a4, < 52dc40ef0cfee6ae89b7524967e73f0ba37906d7; >= 68b025c813c2eb41ff25628e3d4952d5185eb1a4, < 1dd9cb98fe228e017fff9efb33862ff38c741b65; >= 68b025c813c2eb41ff25628e3d4952d5185eb1a4, < 6df926130aee6cab9b5d2e5b7862e49ccac348dc; >= 68b025c813c2eb41ff25628e3d4952d5185eb1a4, < 311011f8cc206c5af2877b03e3f627ee1b8fe024; >= 68b025c813c2eb41ff25628e3d4952d5185eb1a4, < 18a693733f7ad004e1ab0466693121ca70cd95dd; >= 68b025c813c2eb41ff25628e3d4952d5185eb1a4, < 16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454; >= 68b025c813c2eb41ff25628e3d4952d5185eb1a4, < 6883269a323609f68f6faa903f8f8ff3d191cec8; >= 68b025c813c2eb41ff25628e3d4952d5185eb1a4, < 45ca1afe2fd14c04e37227e79d3f8455831d8408
LinuxLinux2.6.39

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-72138?
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 severe is CVE-2026-72138?
Severity scoring for CVE-2026-72138 is pending analysis. The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-72138?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST