{"id":"CVE-2026-89445","revision":"b03ff40520884b26abe3e60b35ae6f26","records":[{"revision":"b03ff40520884b26abe3e60b35ae6f26","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89445","aliases":[],"title":"iommufd: Fix UAF in selftest IOPF reporting","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Fix UAF in selftest IOPF reporting\n\nIOMMUFD selftest TRIGGER_IOPF borrows an attach handle from\ngroup->pasid_array without synchronizing against PASID detach,\nthen a concurrent iommu_report_device_fault() can dereference\nthat borrowed handle's domain pointer after the detach erases\nthe handle and frees the backing struct iommufd_attach_handle.\nTRIGGER_IOPF then dereferences the freed handle, causing a UAF.\n\nFix by adding a iopf_rwsem in mock_dev to follow the expected design\nof a real driver. Hold its read side across the whole\niommu_report_device_fault() call, and its write side around every\npath that attaches, detaches, or replaces a device domain.\nThis can block new reports and drains in-flight reports before an old\nattach handle or the IOPF fault parameter can be removed.\nAlso take the write side while registering a mock device, since\nit can invoke the mock driver's default-domain attach callback.","state":0,"publishedAt":"2026-09-11T19:43:12.765+00:00","modifiedAt":"2026-10-19T08:46:54.686+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/iommu/iommufd/selftest.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"ddee19971081b42615d62f4fdada21274708ed4d\",\n                            \"lessThan\": \"fd2e7ac94d6d813548b021473c3dddc30c8c07d1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ddee19971081b42615d62f4fdada21274708ed4d\",\n                            \"lessThan\": \"cab2895729516799384d48560e6fca105fb3f927\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ddee19971081b42615d62f4fdada21274708ed4d\",\n                            \"lessThan\": \"e27e90bde68b2ab92e63ed19caad1ef57188bea0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ddee19971081b42615d62f4fdada21274708ed4d\",\n                            \"lessThan\": \"8c07df7cdfcf52f1ff276c588612aabc6c6b8399\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/iommu/iommufd/selftest.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.11\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/fd2e7ac94d6d813548b021473c3dddc30c8c07d1","https://git.kernel.org/stable/c/cab2895729516799384d48560e6fca105fb3f927","https://git.kernel.org/stable/c/e27e90bde68b2ab92e63ed19caad1ef57188bea0","https://git.kernel.org/stable/c/8c07df7cdfcf52f1ff276c588612aabc6c6b8399"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89445","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89445","identifiers":["CVE-2026-89445"]},"retained":false,"historicalAffected":[]}],"coverage":[]}