{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-80824", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-80824", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-04T15:54:28.038Z", "updatedAt": "2026-10-19T08:44:16.840Z", "importedAt": "2026-10-24T01:58:30.346Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "usb: usbfs: fix use-after-free of usb_device in usbdev_release()", "summary": "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.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "status": "affected", "versionType": "git", "lessThan": "0a960b88c5979f853019d4dc4957dfbeeb193440" }, { "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "status": "affected", "versionType": "git", "lessThan": "96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf" }, { "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "status": "affected", "versionType": "git", "lessThan": "bd4bffc621a8cb2f4d9ed9b6447415de524a3bef" }, { "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "status": "affected", "versionType": "git", "lessThan": "65879e0a452ca2a234b9475e0c11aff7a4343738" }, { "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "status": "affected", "versionType": "git", "lessThan": "b3cde26a66b04f1d90ed0b675899c88b4e49d424" }, { "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "status": "affected", "versionType": "git", "lessThan": "5f08c45bdcfd28d1171de38c5ef29fc89a76eedc" }, { "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "status": "affected", "versionType": "git", "lessThan": "7f0278e474c4d1c4457974ff1137cc385c944ab3" }, { "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "status": "affected", "versionType": "git", "lessThan": "47a7f98fbb5006d46d15a3a210ffdc61448a4f19" }, { "version": "f7d34b445abc00e979b7cf36b9580ac3d1a47cd8", "status": "affected", "versionType": "git", "lessThan": "0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.6", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.6" }, { "version": "5.10.269", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.220", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.187", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.156", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.108", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.49", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.1.13", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.1.*" }, { "version": "7.2.3", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }