{"id":"CVE-2026-89449","state":"PUBLISHED","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.","publishedAt":"2026-09-11T19:43:15.397Z","updatedAt":"2026-10-19T08:46:58.738Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2a918911ed3d0841923525ed0fe707762ee78844","status":"affected","lessThan":"f80f3acb69164800051ecdee871b6b006cbc2e66","versionType":"git"},{"version":"2a918911ed3d0841923525ed0fe707762ee78844","status":"affected","lessThan":"eaf44262af24810d16800b988c92dfce90f73370","versionType":"git"},{"version":"2a918911ed3d0841923525ed0fe707762ee78844","status":"affected","lessThan":"b7b0b3851474883d4aba6ed72da87141204b23e5","versionType":"git"},{"version":"1daf67217b0d0bf88ef7208d7fbeefe2378c6590","status":"affected","versionType":"git"},{"version":"6.17.3","status":"affected","lessThan":"6.18","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/iommu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/iommu.c"]}],"references":["https://git.kernel.org/stable/c/f80f3acb69164800051ecdee871b6b006cbc2e66","https://git.kernel.org/stable/c/eaf44262af24810d16800b988c92dfce90f73370","https://git.kernel.org/stable/c/b7b0b3851474883d4aba6ed72da87141204b23e5"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89449.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89449","state":"PUBLISHED","datePublished":"2026-09-11T19:43:15.397Z","dateUpdated":"2026-10-19T08:46:58.738Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.706Z"},"containers":{"cna":{"title":"iommu: Fix dev_iommu memory leak when device_add fails in iommu_mock_device_add","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2a918911ed3d0841923525ed0fe707762ee78844","status":"affected","lessThan":"f80f3acb69164800051ecdee871b6b006cbc2e66","versionType":"git"},{"version":"2a918911ed3d0841923525ed0fe707762ee78844","status":"affected","lessThan":"eaf44262af24810d16800b988c92dfce90f73370","versionType":"git"},{"version":"2a918911ed3d0841923525ed0fe707762ee78844","status":"affected","lessThan":"b7b0b3851474883d4aba6ed72da87141204b23e5","versionType":"git"},{"version":"1daf67217b0d0bf88ef7208d7fbeefe2378c6590","status":"affected","versionType":"git"},{"version":"6.17.3","status":"affected","lessThan":"6.18","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/iommu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/iommu.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f80f3acb69164800051ecdee871b6b006cbc2e66"},{"url":"https://git.kernel.org/stable/c/eaf44262af24810d16800b988c92dfce90f73370"},{"url":"https://git.kernel.org/stable/c/b7b0b3851474883d4aba6ed72da87141204b23e5"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:46:58.738Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}