# CVE-2021-47219: linux: In the Linux kernel, the following vulnerability has been resolved:  scsi: scsi_debug: Fix out-of-bound read in resp_...

CVE-2021-47219 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47219, released April 10, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-47219
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 10, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  scsi: scsi_debug: Fix out-of-bound read in resp_report_tgtpgs()  The following issue was observed running syzkaller:  BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:377 [inline] BUG: KASAN: slab-out-of-bounds in sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831 Read of size 2132 at addr ffff8880aea95dc8 by task syz-executor.0/9815  CPU: 0 PID: 9815 Comm: syz-executor.0 Not tainted 4.19.202-00874-gfc0fe04215a9 #2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 Call Trace:  __dump_stack lib/dump_stack.c:77 [inline]  dump_stack+0xe4/0x14a lib/dump_stack.c:118  print_address_description+0x73/0x280 mm/kasan/report.c:253  kasan_report_error mm/kasan/report.c:352 [inline]  kasan_report+0x272/0x370 mm/kasan/report.c:410  memcpy+0x1f/0x50 mm/kasan/kasan.c:302  memcpy include/linux/string.h:377 [inline]  sg_copy_buffer+0x150/0x1c0 lib/scatterlist.c:831  fill_from_dev_buffer+0x14f/0x340 drivers/scsi/scsi_debug.c:1021  resp_report_tgtpgs+0x5aa/0x770 drivers/scsi/scsi_debug.c:1772  schedule_resp+0x464/0x12f0 drivers/scsi/scsi_debug.c:4429  scsi_debug_queuecommand+0x467/0x1390 drivers/scsi/scsi_debug.c:5835  scsi_dispatch_cmd+0x3fc/0x9b0 drivers/scsi/scsi_lib.c:1896  scsi_request_fn+0x1042/0x1810 drivers/scsi/scsi_lib.c:2034  __blk_run_queue_uncond block/blk-core.c:464 [inline]  __blk_run_queue+0x1a4/0x380 block/blk-core.c:484  blk_execute_rq_nowait+0x1c2/0x2d0 block/blk-exec.c:78  sg_common_write.isra.19+0xd74/0x1dc0 drivers/scsi/sg.c:847  sg_write.part.23+0x6e0/0xd00 drivers/scsi/sg.c:716  sg_write+0x64/0xa0 drivers/scsi/sg.c:622  __vfs_write+0xed/0x690 fs/read_write.c:485 kill_bdev:block_device:00000000e138492c  vfs_write+0x184/0x4c0 fs/read_write.c:549  ksys_write+0x107/0x240 fs/read_write.c:599  do_syscall_64+0xc2/0x560 arch/x86/entry/common.c:293  entry_SYSCALL_64_after_hwframe+0x49/0xbe  We get 'alen' from command its type is int. If userspace passes a large length we will get a negative 'alen'.  Switch n, alen, and rlen to u32.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.15.5-1 | [DEBIAN-CVE-2021-47219](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47219.md) | Apr 10, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.15.5-1 | [DEBIAN-CVE-2021-47219](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47219.md) | Apr 10, 2024 |
| Linux | linux Debian 14 | 5.15.5-1 | [DEBIAN-CVE-2021-47219](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47219.md) | Apr 10, 2024 |

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