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Back to active CVEs
High · CVSS 7.8CVE-2021-47576

scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select()CVE-2021-47576

Answer in brief

CVE-2021-47576 records a High severity (CVSS 7.8) vulnerability in scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 19, 2024Updated Aug 5, 2026Source checked Nov 3, 2026First seen by HOL Aug 4, 2026Material review Aug 5, 2026
Upstream Advisory

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-416
Source
CVE List V5
Source checked
Nov 3, 2026
References
7 linked sources
Open source record

Key facts

Risk
High · CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=231839102b54512ced7d3ee7fc9b8bcf5e3b583b <adcecd50da6cab7b4957cba0606771dcc846c5a9 || >=231839102b54512ced7d3ee7fc9b8bcf5e3b583b <90491283b4064220682e4b0687d07b05df01e3bf || >=231839102b54512ced7d3ee7fc9b8bcf5e3b583b <04181973c38f3d6a353f9246dcf7fee08024fd9e || >=231839102b54512ced7d3ee7fc9b8bcf5e3b583b <b847ecff850719c46c95acd25a0d555dfd16e10d || >=231839102b54512ced7d3ee7fc9b8bcf5e3b583b <a9078e791426c2cbbdf28a320c3670f6e0a611e6 || >=231839102b54512ced7d3ee7fc9b8bcf5e3b583b <dfc3fff63793c571147930b13c0f8c689c4281ac || >=231839102b54512ced7d3ee7fc9b8bcf5e3b583b <e0a2c28da11e2c2b963fc01d50acbf03045ac732adcecd50da6cab7b4957cba0606771dcc846c5a9, 90491283b4064220682e4b0687d07b05df01e3bf, 04181973c38f3d6a353f9246dcf7fee08024fd9e, b847ecff850719c46c95acd25a0d555dfd16e10d, a9078e791426c2cbbdf28a320c3670f6e0a611e6, dfc3fff63793c571147930b13c0f8c689c4281ac, e0a2c28da11e2c2b963fc01d50acbf03045ac732
Linux/Linuxgeneric2.6.19Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to adcecd50da6cab7b4957cba0606771dcc846c5a9 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Jun 19, 2024

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 5, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 4, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source 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

Quoted source text, attributed separately from HOL analysis.