{"id":"DEBIAN-CVE-2021-47219","details":"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.","modified":"2026-09-15T09:02:35.407042054Z","published":"2024-04-10T19:15:48.903Z","upstream":["CVE-2021-47219"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2021-47219"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.5-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47219.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.5-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47219.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.5-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47219.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"}]}