{"cve":"CVE-2025-38592","nvd":{"published":"2025-08-19T17:15:36.930","modified":"2026-07-30T06:23:29.050","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_devcd_dump: fix out-of-bounds via dev_coredumpv\n\nCurrently both dev_coredumpv and skb_put_data in hci_devcd_dump use\nhdev->dump.head. However, dev_coredumpv can free the buffer. From\ndev_coredumpm_timeout documentation, which is used by dev_coredumpv:\n\n    > Creates a new device coredump for the given device. If a previous one hasn't\n    > been read yet, the new coredump is discarded. The data lifetime is determined\n    > by the device coredump framework and when it is no longer needed the @free\n    > function will be called to free the data.\n\nIf the data has not been read by the userspace yet, dev_coredumpv will\ndiscard new buffer, freeing hdev->dump.head. This leads to\nvmalloc-out-of-bounds error when skb_put_data tries to access\nhdev->dump.head.\n\nA crash report from syzbot illustrates this:\n\n    ==================================================================\n    BUG: KASAN: vmalloc-out-of-bounds in skb_put_data\n    include/linux/skbuff.h:2752 [inline]\n    BUG: KASAN: vmalloc-out-of-bounds in hci_devcd_dump+0x142/0x240\n    net/bluetooth/coredump.c:258\n    Read of size 140 at addr ffffc90004ed5000 by task kworker/u9:2/5844\n\n    CPU: 1 UID: 0 PID: 5844 Comm: kworker/u9:2 Not tainted\n    6.14.0-syzkaller-10892-g4e82c87058f4 #0 PREEMPT(full)\n    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS\n    Google 02/12/2025\n    Workqueue: hci0 hci_devcd_timeout\n    Call Trace:\n     <TASK>\n     __dump_stack lib/dump_stack.c:94 [inline]\n     dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\n     print_address_description mm/kasan/report.c:408 [inline]\n     print_report+0xc3/0x670 mm/kasan/report.c:521\n     kasan_report+0xe0/0x110 mm/kasan/report.c:634\n     check_region_inline mm/kasan/generic.c:183 [inline]\n     kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189\n     __asan_memcpy+0x23/0x60 mm/kasan/shadow.c:105\n     skb_put_data include/linux/skbuff.h:2752 [inline]\n     hci_devcd_dump+0x142/0x240 net/bluetooth/coredump.c:258\n     hci_devcd_timeout+0xb5/0x2e0 net/bluetooth/coredump.c:413\n     process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238\n     process_scheduled_works kernel/workqueue.c:3319 [inline]\n     worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400\n     kthread+0x3c2/0x780 kernel/kthread.c:464\n     ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153\n     ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n     </TASK>\n\n    The buggy address ffffc90004ed5000 belongs to a vmalloc virtual mapping\n    Memory state around the buggy address:\n     ffffc90004ed4f00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n     ffffc90004ed4f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n    >ffffc90004ed5000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n                       ^\n     ffffc90004ed5080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n     ffffc90004ed5100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n    ==================================================================\n\nTo avoid this issue, reorder dev_coredumpv to be called after\nskb_put_data that does not free the data.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","score":7.1},"cwes":["CWE-125"],"references":["https://git.kernel.org/stable/c/7af4d7b53502286c6cf946d397ab183e76d14820","https://git.kernel.org/stable/c/8c021ad797f9171d015cf0a932a3fbe5232190f5","https://git.kernel.org/stable/c/efd55f6a59449f8d4e4953f12c177aa902b7451f"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:07:46.309729541+00:00"},"epss":{"cve":"CVE-2025-38592","score":0.00234,"percentile":0.143,"date":"2026-10-31"},"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."]}