{"cve":"CVE-2021-47576","nvd":{"published":"2024-06-19T15:15:52.117","modified":"2026-08-04T10:17:09.170","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: scsi_debug: Sanity check block descriptor length in resp_mode_select()\n\nIn resp_mode_select() sanity check the block descriptor len to avoid UAF.\n\nBUG: KASAN: use-after-free in resp_mode_select+0xa4c/0xb40 drivers/scsi/scsi_debug.c:2509\nRead of size 1 at addr ffff888026670f50 by task scsicmd/15032\n\nCPU: 1 PID: 15032 Comm: scsicmd Not tainted 5.15.0-01d0625 #15\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\nCall Trace:\n <TASK>\n dump_stack_lvl+0x89/0xb5 lib/dump_stack.c:107\n print_address_description.constprop.9+0x28/0x160 mm/kasan/report.c:257\n kasan_report.cold.14+0x7d/0x117 mm/kasan/report.c:443\n __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306\n resp_mode_select+0xa4c/0xb40 drivers/scsi/scsi_debug.c:2509\n schedule_resp+0x4af/0x1a10 drivers/scsi/scsi_debug.c:5483\n scsi_debug_queuecommand+0x8c9/0x1e70 drivers/scsi/scsi_debug.c:7537\n scsi_queue_rq+0x16b4/0x2d10 drivers/scsi/scsi_lib.c:1521\n blk_mq_dispatch_rq_list+0xb9b/0x2700 block/blk-mq.c:1640\n __blk_mq_sched_dispatch_requests+0x28f/0x590 block/blk-mq-sched.c:325\n blk_mq_sched_dispatch_requests+0x105/0x190 block/blk-mq-sched.c:358\n __blk_mq_run_hw_queue+0xe5/0x150 block/blk-mq.c:1762\n __blk_mq_delay_run_hw_queue+0x4f8/0x5c0 block/blk-mq.c:1839\n blk_mq_run_hw_queue+0x18d/0x350 block/blk-mq.c:1891\n blk_mq_sched_insert_request+0x3db/0x4e0 block/blk-mq-sched.c:474\n blk_execute_rq_nowait+0x16b/0x1c0 block/blk-exec.c:63\n sg_common_write.isra.18+0xeb3/0x2000 drivers/scsi/sg.c:837\n sg_new_write.isra.19+0x570/0x8c0 drivers/scsi/sg.c:775\n sg_ioctl_common+0x14d6/0x2710 drivers/scsi/sg.c:941\n sg_ioctl+0xa2/0x180 drivers/scsi/sg.c:1166\n __x64_sys_ioctl+0x19d/0x220 fs/ioctl.c:52\n do_syscall_64+0x3a/0x80 arch/x86/entry/common.c:50\n entry_SYSCALL_64_after_hwframe+0x44/0xae arch/x86/entry/entry_64.S:113","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:H/A:H","score":7.8},"cwes":["CWE-416"],"references":["https://git.kernel.org/stable/c/04181973c38f3d6a353f9246dcf7fee08024fd9e","https://git.kernel.org/stable/c/90491283b4064220682e4b0687d07b05df01e3bf","https://git.kernel.org/stable/c/a9078e791426c2cbbdf28a320c3670f6e0a611e6","https://git.kernel.org/stable/c/adcecd50da6cab7b4957cba0606771dcc846c5a9","https://git.kernel.org/stable/c/b847ecff850719c46c95acd25a0d555dfd16e10d"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:52:00.836172422+00:00"},"epss":{"cve":"CVE-2021-47576","score":0.00256,"percentile":0.17197,"date":"2026-11-01"},"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."]}