CVE-2026-72138

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The mapping remains in priv->maps\nwith a refcount of 1, causing a memory leak and a dangling list\nentry.\n\nAdditionally, gntdev_add_map() may modify map->index 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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/xen/gntdev.c"], "versions": [{"version": "68b025c813c2eb41ff25628e3d4952d5185eb1a4", "lessThan": "52dc40ef0cfee6ae89b7524967e73f0ba37906d7", "status": "affected", "versionType": "git"}, {"version": "68b025c813c2eb41ff25628e3d4952d5185eb1a4", "lessThan": "1dd9cb98fe228e017fff9efb33862ff38c741b65", "status": "affected", "versionType": "git"}, {"version": "68b025c813c2eb41ff25628e3d4952d5185eb1a4", "lessThan": "6df926130aee6cab9b5d2e5b7862e49ccac348dc", "status": "affected", "versionType": "git"}, {"version": "68b025c813c2eb41ff25628e3d4952d5185eb1a4", "lessThan": "311011f8cc206c5af2877b03e3f627ee1b8fe024", "status": "affected", 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The mapping remains in priv->maps\nwith a refcount of 1, causing a memory leak and a dangling list\nentry.\n\nAdditionally, gntdev_add_map() may modify map->index 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."}], "id": "CVE-2026-72138", "lastModified": "2026-11-06T17:19:37.850", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-72138", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:51:54.267529Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:21:31.337", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/16d3ccdabb8dee9be2cdcd6d3f9a125572ec0454"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/18a693733f7ad004e1ab0466693121ca70cd95dd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1dd9cb98fe228e017fff9efb33862ff38c741b65"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/311011f8cc206c5af2877b03e3f627ee1b8fe024"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/45ca1afe2fd14c04e37227e79d3f8455831d8408"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/52dc40ef0cfee6ae89b7524967e73f0ba37906d7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6883269a323609f68f6faa903f8f8ff3d191cec8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6df926130aee6cab9b5d2e5b7862e49ccac348dc"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: xen/gntdev: fix error handling in ioctl", "id": "2516334", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516334"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-772", "details": ["A flaw was found in the `xen/gntdev` component of the Linux kernel. When the `gntdev_ioctl_map_grant_ref()` function fails to copy operation results back to userspace, it does not properly release a memory reference. This oversight can lead to a memory leak and a corrupted list entry. A local attacker could exploit this to cause a denial of service by exhausting system memory."], "name": "CVE-2026-72138", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72138\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72138\nhttps://lore.kernel.org/linux-cve-announce/2026081531-CVE-2026-72138-5d33@gregkh/T"], "threat_severity": "Moderate"}

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