{"cve":"CVE-2026-89449","nvd":{"published":"2026-09-11T20:19:25.473","modified":"2026-10-19T09:17:37.123","status":"Received","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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/b7b0b3851474883d4aba6ed72da87141204b23e5","https://git.kernel.org/stable/c/eaf44262af24810d16800b988c92dfce90f73370","https://git.kernel.org/stable/c/f80f3acb69164800051ecdee871b6b006cbc2e66"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-89449","score":0.00206,"percentile":0.10632,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}