# CVE-2021-47576: linux: In the Linux kernel, the following vulnerability has been resolved:  scsi: scsi_debug: Sanity check block descriptor...

CVE-2021-47576 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47576, released June 19, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-47576
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 19, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select()  In resp_mode_select() sanity check the block descriptor len to avoid UAF.  BUG: KASAN: use-after-free in resp_mode_select+0xa4c/0xb40 drivers/scsi/scsi_debug.c:2509 Read of size 1 at addr ffff888026670f50 by task scsicmd/15032  CPU: 1 PID: 15032 Comm: scsicmd Not tainted 5.15.0-01d0625 #15 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Call Trace:  <TASK>  dump_stack_lvl+0x89/0xb5 lib/dump_stack.c:107  print_address_description.constprop.9+0x28/0x160 mm/kasan/report.c:257  kasan_report.cold.14+0x7d/0x117 mm/kasan/report.c:443  __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306  resp_mode_select+0xa4c/0xb40 drivers/scsi/scsi_debug.c:2509  schedule_resp+0x4af/0x1a10 drivers/scsi/scsi_debug.c:5483  scsi_debug_queuecommand+0x8c9/0x1e70 drivers/scsi/scsi_debug.c:7537  scsi_queue_rq+0x16b4/0x2d10 drivers/scsi/scsi_lib.c:1521  blk_mq_dispatch_rq_list+0xb9b/0x2700 block/blk-mq.c:1640  __blk_mq_sched_dispatch_requests+0x28f/0x590 block/blk-mq-sched.c:325  blk_mq_sched_dispatch_requests+0x105/0x190 block/blk-mq-sched.c:358  __blk_mq_run_hw_queue+0xe5/0x150 block/blk-mq.c:1762  __blk_mq_delay_run_hw_queue+0x4f8/0x5c0 block/blk-mq.c:1839  blk_mq_run_hw_queue+0x18d/0x350 block/blk-mq.c:1891  blk_mq_sched_insert_request+0x3db/0x4e0 block/blk-mq-sched.c:474  blk_execute_rq_nowait+0x16b/0x1c0 block/blk-exec.c:63  sg_common_write.isra.18+0xeb3/0x2000 drivers/scsi/sg.c:837  sg_new_write.isra.19+0x570/0x8c0 drivers/scsi/sg.c:775  sg_ioctl_common+0x14d6/0x2710 drivers/scsi/sg.c:941  sg_ioctl+0xa2/0x180 drivers/scsi/sg.c:1166  __x64_sys_ioctl+0x19d/0x220 fs/ioctl.c:52  do_syscall_64+0x3a/0x80 arch/x86/entry/common.c:50  entry_SYSCALL_64_after_hwframe+0x44/0xae arch/x86/entry/entry_64.S:113

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.15.15-1 | [DEBIAN-CVE-2021-47576](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47576.md) | Jun 19, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.15.15-1 | [DEBIAN-CVE-2021-47576](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47576.md) | Jun 19, 2024 |
| Linux | linux Debian 14 | 5.15.15-1 | [DEBIAN-CVE-2021-47576](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47576.md) | Jun 19, 2024 |

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