{"id":"CVE-2026-89449","revision":"1da8a1fdaf6a45cd98f2460876f80c30","records":[{"revision":"1da8a1fdaf6a45cd98f2460876f80c30","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89449","aliases":[],"title":"iommu: Fix dev_iommu memory leak when device_add fails in iommu_mock_device_add","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu: Fix dev_iommu memory leak when device_add fails in iommu_mock_device_add\n\niommu_mock_device_add() first calls iommu_fwspec_init(), which on\nsuccess allocates both dev->iommu (via dev_iommu_get()) and\ndev->iommu->fwspec. If the subsequent device_add(dev) call fails,\nthe error path only calls iommu_fwspec_free(dev), which frees\nfwspec but leaves dev->iommu still allocated.\n\nThis triggers the following kmemleak report when fuzzing with Syzkaller:\n\nBUG: memory leak\nunreferenced object 0xffff888011e0a200 (size 192):\n  comm \"syz.1.1695\", pid 24885, jiffies 4295222527\n  hex dump (first 32 bytes):\n    00 00 00 00 00 00 00 00 00 00 00 00 ad 4e ad de  .............N..\n    ff ff ff ff 00 00 00 00 ff ff ff ff ff ff ff ff  ................\n  backtrace (crc 25df5bb3):\n    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]\n    slab_post_alloc_hook mm/slub.c:4575 [inline]\n    slab_alloc_node mm/slub.c:4899 [inline]\n    __kmalloc_cache_noprof+0x47a/0x710 mm/slub.c:5415\n    kmalloc_noprof include/linux/slab.h:950 [inline]\n    kzalloc_noprof include/linux/slab.h:1188 [inline]\n    dev_iommu_get+0x10c/0x1a0 drivers/iommu/iommu.c:408\n    iommu_fwspec_init+0x288/0x4d0 drivers/iommu/iommu.c:3087\n    iommu_mock_device_add+0x46/0xb0 drivers/iommu/iommu.c:385\n    mock_dev_create drivers/iommu/iommufd/selftest.c:1025 [inline]\n    iommufd_test_mock_domain drivers/iommu/iommufd/selftest.c:1066 [inline]\n    iommufd_test+0x2f8a/0x6190 drivers/iommu/iommufd/selftest.c:2072\n    iommufd_fops_ioctl+0x367/0x540 drivers/iommu/iommufd/main.c:533\n    vfs_ioctl fs/ioctl.c:51 [inline]\n    __do_sys_ioctl fs/ioctl.c:597 [inline]\n    __se_sys_ioctl fs/ioctl.c:583 [inline]\n    __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583\n    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n    do_syscall_64+0x116/0x800 arch/x86/entry/syscall_64.c:94\n    entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFix this by calling dev_iommu_free(dev) instead of iommu_fwspec_free(dev)\nin the device_add() failure path. dev_iommu_free() frees both fwspec\nand the outer dev_iommu struct and clears dev->iommu.","state":0,"publishedAt":"2026-09-11T19:43:15.397+00:00","modifiedAt":"2026-10-19T08:46:58.738+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/iommu.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2a918911ed3d0841923525ed0fe707762ee78844\",\n                            \"lessThan\": \"f80f3acb69164800051ecdee871b6b006cbc2e66\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2a918911ed3d0841923525ed0fe707762ee78844\",\n                            \"lessThan\": \"eaf44262af24810d16800b988c92dfce90f73370\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2a918911ed3d0841923525ed0fe707762ee78844\",\n                            \"lessThan\": \"b7b0b3851474883d4aba6ed72da87141204b23e5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1daf67217b0d0bf88ef7208d7fbeefe2378c6590\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6.17.3\",\n                            \"lessThan\": \"6.18\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\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/iommu.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.18\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.18\",\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":[],"references":["https://git.kernel.org/stable/c/f80f3acb69164800051ecdee871b6b006cbc2e66","https://git.kernel.org/stable/c/eaf44262af24810d16800b988c92dfce90f73370","https://git.kernel.org/stable/c/b7b0b3851474883d4aba6ed72da87141204b23e5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89449","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89449","identifiers":["CVE-2026-89449"]},"retained":false,"historicalAffected":[]}],"coverage":[]}