{"id":"CVE-2024-56669","summary":"iommu/vt-d: Remove cache tags before disabling ATS","details":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: Remove cache tags before disabling ATS\n\nThe current implementation removes cache tags after disabling ATS,\nleading to potential memory leaks and kernel crashes. Specifically,\nCACHE_TAG_DEVTLB type cache tags may still remain in the list even\nafter the domain is freed, causing a use-after-free condition.\n\nThis issue really shows up when multiple VFs from different PFs\npassed through to a single user-space process via vfio-pci. In such\ncases, the kernel may crash with kernel messages like:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000014\n PGD 19036a067 P4D 1940a3067 PUD 136c9b067 PMD 0\n Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI\n CPU: 74 UID: 0 PID: 3183 Comm: testCli Not tainted 6.11.9 #2\n RIP: 0010:cache_tag_flush_range+0x9b/0x250\n Call Trace:\n  \u003cTASK\u003e\n  ? __die+0x1f/0x60\n  ? page_fault_oops+0x163/0x590\n  ? exc_page_fault+0x72/0x190\n  ? asm_exc_page_fault+0x22/0x30\n  ? cache_tag_flush_range+0x9b/0x250\n  ? cache_tag_flush_range+0x5d/0x250\n  intel_iommu_tlb_sync+0x29/0x40\n  intel_iommu_unmap_pages+0xfe/0x160\n  __iommu_unmap+0xd8/0x1a0\n  vfio_unmap_unpin+0x182/0x340 [vfio_iommu_type1]\n  vfio_remove_dma+0x2a/0xb0 [vfio_iommu_type1]\n  vfio_iommu_type1_ioctl+0xafa/0x18e0 [vfio_iommu_type1]\n\nMove cache_tag_unassign_domain() before iommu_disable_pci_caps() to fix\nit.","modified":"2026-04-02T12:25:04.995818Z","published":"2024-12-27T15:06:30.792Z","related":["USN-7379-2","USN-7380-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56669.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1f2557e08a617a4b5e92a48a1a9a6f86621def18"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9a0a72d3ed919ebe6491f527630998be053151d8"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56669.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-56669"},{"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":"3b1d9e2b2d6856eabf5faa12d20c97fef657999f"},{"fixed":"9a0a72d3ed919ebe6491f527630998be053151d8"},{"fixed":"1f2557e08a617a4b5e92a48a1a9a6f86621def18"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56669.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}