{"id":"CVE-2026-80824","revision":"272470888ec6478c97cdfc985dea2a53","records":[{"revision":"272470888ec6478c97cdfc985dea2a53","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-80824","aliases":[],"title":"usb: usbfs: fix use-after-free of usb_device in usbdev_release()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: usbfs: fix use-after-free of usb_device in usbdev_release()\n\nusbdev_release() drops its reference to the struct usb_device before\ndraining the list of completed async URBs, but that drain path reads back\nthrough the same object: free_async() calls dec_usb_memory_use_count()\nfor any URB whose buffer came from the usbfs mmap() region, and its first\nstatement is bus_to_hcd(ps->dev->bus).\n\nAfter a disconnect the usbfs reference can be the last one, in which case\nusb_put_dev() frees the device and the subsequent loop reads offset 80 of\nfreed memory and uses the result as a struct usb_hcd *, which\nhcd_buffer_free_pages() then dereferences.\n\nThis is reachable by an unprivileged process that has read/write access to\na /dev/bus/usb node: mmap() the fd, submit one URB with a buffer inside the\nmapping, wait for the device to be unplugged, then munmap() and close().\nIt reproduces on every attempt rather than being a race, because a live\nMAP_SHARED vma holds a reference on the struct file, so usbdev_release()\ncannot run until the last vma is gone and the freeing branch of\ndec_usb_memory_use_count() is always taken.\n\n  BUG: KASAN: slab-use-after-free in dec_usb_memory_use_count+0x3ae/0x410\n  Read of size 8 at addr ffff8880122ee050 by task poc/769\n  CPU: 1 UID: 1000 PID: 769 Comm: poc Tainted: G    B    6.12.94 #3\n\n  Call Trace:\n   dec_usb_memory_use_count+0x3ae/0x410\n   free_async+0x2aa/0x4f0\n   usbdev_release+0x375/0x460\n   __fput+0x3ea/0xb50\n   __x64_sys_close+0x86/0x100\n\n  Allocated by task 11:\n   usb_alloc_dev+0x55/0xd90\n   hub_event+0x2524/0x43d0\n\n  Freed by task 769:\n   kfree+0x121/0x360\n   device_release+0xd2/0x280\n   usb_put_dev+0x23/0x30\n   usbdev_release+0x2d8/0x460\n\nRelease the device reference after the drain loop instead. Nothing between\nthe two points requires it to have been dropped.","state":0,"publishedAt":"2026-09-04T15:54:28.038+00:00","modifiedAt":"2026-10-19T08:44:16.84+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/usb/core/devio.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\n                            \"lessThan\": \"0a960b88c5979f853019d4dc4957dfbeeb193440\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\n                            \"lessThan\": \"96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\n                            \"lessThan\": \"bd4bffc621a8cb2f4d9ed9b6447415de524a3bef\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\n                            \"lessThan\": \"65879e0a452ca2a234b9475e0c11aff7a4343738\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\n                            \"lessThan\": \"b3cde26a66b04f1d90ed0b675899c88b4e49d424\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\n                            \"lessThan\": \"5f08c45bdcfd28d1171de38c5ef29fc89a76eedc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\n                            \"lessThan\": \"7f0278e474c4d1c4457974ff1137cc385c944ab3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\n                            \"lessThan\": \"47a7f98fbb5006d46d15a3a210ffdc61448a4f19\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\n                            \"lessThan\": \"0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/usb/core/devio.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.6\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.269\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.220\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.187\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.156\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.108\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.49\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.13\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.3\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/0a960b88c5979f853019d4dc4957dfbeeb193440","https://git.kernel.org/stable/c/96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf","https://git.kernel.org/stable/c/bd4bffc621a8cb2f4d9ed9b6447415de524a3bef","https://git.kernel.org/stable/c/65879e0a452ca2a234b9475e0c11aff7a4343738","https://git.kernel.org/stable/c/b3cde26a66b04f1d90ed0b675899c88b4e49d424","https://git.kernel.org/stable/c/5f08c45bdcfd28d1171de38c5ef29fc89a76eedc","https://git.kernel.org/stable/c/7f0278e474c4d1c4457974ff1137cc385c944ab3","https://git.kernel.org/stable/c/47a7f98fbb5006d46d15a3a210ffdc61448a4f19","https://git.kernel.org/stable/c/0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80824","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-80824","identifiers":["CVE-2026-80824"]},"retained":false,"historicalAffected":[]}],"coverage":[]}