{"id":"CVE-2026-72138","summary":"xen/gntdev: fix error handling in ioctl","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nxen/gntdev: fix error handling in ioctl\n\nWhen gntdev_ioctl_map_grant_ref() fails to copy the operation result\nback to userspace after successfully adding the mapping to the list,\nthe error path returns -EFAULT without releasing the reference\nacquired by gntdev_alloc_map(). The mapping remains in priv-\u003emaps\nwith a refcount of 1, causing a memory leak and a dangling list\nentry.\n\nAdditionally, gntdev_add_map() may modify map-\u003eindex to avoid overlap\nwith existing mappings. Therefore, the index returned to userspace\nmust be obtained after gntdev_add_map() completes.\n\nFix this by holding the mutex across gntdev_add_map(), retrieving\nthe correct index, and copy_to_user(). If copy_to_user() fails,\nremove the mapping from the list and release the reference while\nstill holding the lock.\n\n\nFix these issues by properly handling all error cases.","modified":"2026-08-18T03:31:16.962103485Z","published":"2026-08-15T05:53:12.549Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72138.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454"},{"type":"WEB","url":"https://git.kernel.org/stable/c/18a693733f7ad004e1ab0466693121ca70cd95dd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1dd9cb98fe228e017fff9efb33862ff38c741b65"},{"type":"WEB","url":"https://git.kernel.org/stable/c/311011f8cc206c5af2877b03e3f627ee1b8fe024"},{"type":"WEB","url":"https://git.kernel.org/stable/c/45ca1afe2fd14c04e37227e79d3f8455831d8408"},{"type":"WEB","url":"https://git.kernel.org/stable/c/52dc40ef0cfee6ae89b7524967e73f0ba37906d7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6883269a323609f68f6faa903f8f8ff3d191cec8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6df926130aee6cab9b5d2e5b7862e49ccac348dc"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72138.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72138"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"68b025c813c2eb41ff25628e3d4952d5185eb1a4"},{"fixed":"52dc40ef0cfee6ae89b7524967e73f0ba37906d7"},{"fixed":"1dd9cb98fe228e017fff9efb33862ff38c741b65"},{"fixed":"6df926130aee6cab9b5d2e5b7862e49ccac348dc"},{"fixed":"311011f8cc206c5af2877b03e3f627ee1b8fe024"},{"fixed":"18a693733f7ad004e1ab0466693121ca70cd95dd"},{"fixed":"16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454"},{"fixed":"6883269a323609f68f6faa903f8f8ff3d191cec8"},{"fixed":"45ca1afe2fd14c04e37227e79d3f8455831d8408"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72138.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.39"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72138.json"}}],"schema_version":"1.9.0"}