{"id":"CVE-2026-89449","summary":"iommu: Fix dev_iommu memory leak when device_add fails in iommu_mock_device_add","details":"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-\u003eiommu (via dev_iommu_get()) and\ndev-\u003eiommu-\u003efwspec. If the subsequent device_add(dev) call fails,\nthe error path only calls iommu_fwspec_free(dev), which frees\nfwspec but leaves dev-\u003eiommu 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-\u003eiommu.","modified":"2026-09-13T03:47:18.282877651Z","published":"2026-09-11T19:43:15.397Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89449.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/b7b0b3851474883d4aba6ed72da87141204b23e5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eaf44262af24810d16800b988c92dfce90f73370"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f80f3acb69164800051ecdee871b6b006cbc2e66"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89449.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89449"},{"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":"2a918911ed3d0841923525ed0fe707762ee78844"},{"fixed":"f80f3acb69164800051ecdee871b6b006cbc2e66"},{"fixed":"eaf44262af24810d16800b988c92dfce90f73370"},{"fixed":"b7b0b3851474883d4aba6ed72da87141204b23e5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"1daf67217b0d0bf88ef7208d7fbeefe2378c6590"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.17.3"},{"fixed":"6.18"}]}],"versions":["v6.17.2","v6.17.1","v6.17","v6.17-rc7","v6.17-rc1","v6.17-rc2","v6.17-rc6","v6.17-rc4","v6.17-rc5","v6.17-rc3","v6.16","v6.16-rc6","v6.16-rc1","v6.16-rc4","v6.16-rc2","v6.16-rc5","v6.16-rc7","v6.16-rc3","v6.14-rc3","v6.15","v6.15-rc1","v6.15-rc6","v6.15-rc3","v6.15-rc2","v6.15-rc7","v6.15-rc4","v6.15-rc5","v6.14","v6.14-rc1","v6.14-rc7","v6.14-rc6","v6.14-rc4","v6.14-rc5","v6.14-rc2","v6.13","v6.13-rc1","v6.13-rc6","v6.13-rc7","v6.13-rc2","v6.13-rc5","v6.13-rc3","v6.12-rc1","v6.13-rc4","v6.12","v6.12-rc7","v6.12-rc3","v6.12-rc4","v6.12-rc6","v6.12-rc5","v6.12-rc2","v6.11-rc1","v6.11-rc5","v6.11","v6.11-rc7","v6.10-rc1","v6.11-rc6","v6.11-rc3","v6.11-rc4","v6.11-rc2","v6.10","v6.10-rc6","v6.10-rc7","v6.10-rc3","v6.9-rc1","v6.10-rc5","v6.10-rc2","v6.10-rc4","v6.9","v6.9-rc6","v6.9-rc7","v6.9-rc5","v6.9-rc3","v6.9-rc2","v6.8","v6.9-rc4","v6.8-rc1","v6.7-rc1","v6.8-rc7","v6.8-rc6","v6.8-rc5","v6.8-rc4","v6.8-rc3","v6.8-rc2","v6.7","v6.7-rc3","v6.7-rc8","v6.7-rc7","v6.7-rc6","v6.7-rc2","v6.7-rc4","v6.7-rc5","v6.6","v6.6-rc1","v6.6-rc5","v6.6-rc3","v6.6-rc7","v6.6-rc6","v6.6-rc4","v6.6-rc2","v6.5","v6.5-rc1","v6.5-rc2","v6.5-rc7","v6.5-rc4","v6.5-rc3","v6.5-rc6","v6.5-rc5","v6.4","v6.4-rc7","v6.4-rc1","v6.4-rc6","v6.4-rc5","v6.4-rc3","v6.4-rc4","v6.4-rc2","v6.3","v6.3-rc1","v6.3-rc7","v6.3-rc2","v6.3-rc3","v6.3-rc5","v6.3-rc6","v6.3-rc4","v6.2-rc6","v6.2-rc1","v6.2","v6.2-rc2","v6.2-rc8","v6.2-rc5","v6.2-rc4","v6.2-rc7","v6.2-rc3","v6.1-rc1","v6.1","v6.1-rc8","v6.1-rc3","v6.1-rc6","v6.1-rc7","v6.1-rc4","v6.1-rc2","v6.1-rc5","v6.0-rc1","v6.0","v6.0-rc7","v6.0-rc3","v6.0-rc2","v6.0-rc6","v6.0-rc4","v6.0-rc5","v5.19","v5.19-rc1","v5.19-rc5","v5.19-rc8","v5.19-rc6","v5.18","v5.19-rc2","v5.19-rc7","v5.19-rc3","v5.19-rc4","v5.18-rc1","v5.18-rc7","v5.18-rc2","v5.18-rc5","v5.17","v5.18-rc4","v5.18-rc3","v5.18-rc6","v5.17-rc6","v5.17-rc4","v5.17-rc8","v5.17-rc7","v5.17-rc1","v5.17-rc3","v5.17-rc2","v5.17-rc5","v5.16","v5.16-rc1","v5.16-rc8","v5.16-rc5","v5.16-rc6","v5.16-rc7","v5.16-rc3","v5.16-rc2","v5.16-rc4","v5.15","v5.15-rc2","v5.15-rc1","v5.15-rc4","v5.15-rc7","v5.15-rc3","v5.15-rc5","v5.15-rc6","v5.14","v5.14-rc3","v5.14-rc1","v5.14-rc2","v5.14-rc7","v5.14-rc6","v5.13-rc1","v5.14-rc5","v5.14-rc4","v5.13","v5.13-rc6","v5.13-rc7","v5.13-rc3","v5.13-rc2","v5.13-rc4","v5.13-rc5","v5.12","v5.12-rc2","v5.12-rc1-dontuse","v5.12-rc1","v5.12-rc8","v5.12-rc3","v5.12-rc7","v5.12-rc5","v5.12-rc6","v5.12-rc4","v5.10","v5.11","v5.11-rc3","v5.11-rc7","v5.11-rc6","v5.11-rc5","v5.11-rc1","v5.11-rc4","v5.11-rc2","v5.10-rc1","v5.10-rc7","v5.10-rc4","v5.10-rc3","v5.10-rc6","v5.9","v5.10-rc2","v5.10-rc5","v5.9-rc1","v5.9-rc7","v5.9-rc8","v5.9-rc6","v5.9-rc4","v5.9-rc5","v5.9-rc3","v5.9-rc2","v5.8","v5.7","v5.8-rc2","v5.8-rc1","v5.8-rc7","v5.8-rc5","v5.8-rc3","v5.8-rc4","v5.8-rc6","v5.7-rc4","v5.7-rc7","v5.7-rc1","v5.7-rc3","v5.7-rc2","v5.7-rc5","v5.7-rc6","v5.6","v5.6-rc1","v5.6-rc7","v5.6-rc6","v5.6-rc3","v5.6-rc4","v5.6-rc2","v5.6-rc5","v5.5","v5.5-rc5","v5.5-rc7","v5.5-rc2","v5.5-rc1","v5.4","v5.5-rc4","v5.5-rc3","v5.5-rc6","v5.4-rc1","v5.4-rc6","v5.4-rc3","v5.4-rc4","v5.4-rc8","v5.4-rc7","v5.4-rc5","v5.3","v5.4-rc2","v5.3-rc5","v5.3-rc1","v5.3-rc2","v5.3-rc3","v5.3-rc8","v5.3-rc7","v5.3-rc4","v5.2","v5.3-rc6","v5.2-rc2","v5.2-rc7","v5.2-rc4","v5.2-rc1","v5.2-rc5","v5.2-rc6","v5.2-rc3","v5.1","v5.0-rc8","v5.1-rc7","v5.1-rc1","v5.1-rc6","v5.1-rc5","v5.0","v5.1-rc3","v5.1-rc2","v5.1-rc4","v5.0-rc1","v5.0-rc4","v5.0-rc3","v5.0-rc6","v5.0-rc7","v5.0-r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