CVE-2026-89449

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

iommu: Fix dev_iommu memory leak when device_add fails in iommu_mock_device_add

iommu_mock_device_add() first calls iommu_fwspec_init(), which on

success allocates both dev->iommu (via dev_iommu_get()) and

dev->iommu->fwspec. If the subsequent device_add(dev) call fails,

the error path only calls iommu_fwspec_free(dev), which frees

fwspec but leaves dev->iommu still allocated.

This triggers the following kmemleak report when fuzzing with Syzkaller:

BUG: memory leak

unreferenced object 0xffff888011e0a200 (size 192):

comm "syz.1.1695", pid 24885, jiffies 4295222527

hex dump (first 32 bytes):

00 00 00 00 00 00 00 00 00 00 00 00 ad 4e ad de .............N..

ff ff ff ff 00 00 00 00 ff ff ff ff ff ff ff ff ................

backtrace (crc 25df5bb3):

kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]

slab_post_alloc_hook mm/slub.c:4575 [inline]

slab_alloc_node mm/slub.c:4899 [inline]

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References