CVE-2026-89447

In the Linux kernel, the following vulnerability has been resolved: iommufd: Avoid locking internal accesses during unmap iommufd_access_notify_unmap() skips internal accesses because they do not have an external unmap callback to invoke. However, the current test calls iommufd_lock_obj() before checking whether the access is internal. If iommufd_lock_obj() succeeds, the loop then sees the internal access and continues, bypassing the matching iommufd_put_object() used by the normal unmap path. This leaks the object reference taken by iommufd_lock_obj(). Check for internal accesses first so skipped entries are never locked.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/0dbcdf4473a614adbd732d567c9b39ac0e040e0c
https://git.kernel.org/stable/c/436189ee4bb2c7c993b945d68570dd38c3e4349e
https://git.kernel.org/stable/c/50a66a63d1c841ae6b28a4551f642c1bba4c9529

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-11 20:19

Updated : 2026-09-11 20:19

NVD link : CVE-2026-89447

Mitre link : CVE-2026-89447

CVE.ORG link : CVE-2026-89447

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-89447", "cveTags": [], "metrics": {}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0", "lessThan": "436189ee4bb2c7c993b945d68570dd38c3e4349e", "versionType": "git"}, {"status": "affected", "version": "27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0", "lessThan": "50a66a63d1c841ae6b28a4551f642c1bba4c9529", "versionType": "git"}, {"status": "affected", "version": "27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0", "lessThan": "0dbcdf4473a614adbd732d567c9b39ac0e040e0c", "versionType": "git"}], "programFiles": ["drivers/iommu/iommufd/device.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.17"}, {"status": "unaffected", "version": "0", "lessThan": "6.17", "versionType": "semver"}, {"status": "unaffected", "version": "6.18.50", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.4", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/iommu/iommufd/device.c"], "defaultStatus": "affected"}]}], "published": "2026-09-11T20:19:25.227", "references": [{"url": "https://git.kernel.org/stable/c/0dbcdf4473a614adbd732d567c9b39ac0e040e0c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/436189ee4bb2c7c993b945d68570dd38c3e4349e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/50a66a63d1c841ae6b28a4551f642c1bba4c9529", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Avoid locking internal accesses during unmap\n\niommufd_access_notify_unmap() skips internal accesses because they do\nnot have an external unmap callback to invoke.\n\nHowever, the current test calls iommufd_lock_obj() before checking\nwhether the access is internal. If iommufd_lock_obj() succeeds, the loop\nthen sees the internal access and continues, bypassing the matching\niommufd_put_object() used by the normal unmap path. This leaks the\nobject reference taken by iommufd_lock_obj().\n\nCheck for internal accesses first so skipped entries are never locked."}], "lastModified": "2026-09-11T20:19:25.227", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}