CVE-2021-47576

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2024-06-19. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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: 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

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

June 19, 2024

Last Modified

August 5, 2026

Advisory Details (7)

Auto-updated Aug 4, 2026
No patch confirmed yet.
generic

scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a9078e791426c2cbbdf28a320c3670f6e0a611e6
generic

scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/90491283b4064220682e4b0687d07b05df01e3bf
generic

scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/04181973c38f3d6a353f9246dcf7fee08024fd9e
generic

scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e0a2c28da11e2c2b963fc01d50acbf03045ac732
generic

scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dfc3fff63793c571147930b13c0f8c689c4281ac
generic

scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b847ecff850719c46c95acd25a0d555dfd16e10d
generic

scsi: scsi_debug: Sanity check block descriptor length in resp_mode_select() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/adcecd50da6cab7b4957cba0606771dcc846c5a9

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-lts-xenial (4.4.0.270.276) @ xenial2026-05-23ubuntu
ubuntulinux-tools-fips (4.4.0.1115.116) @ xenial2026-05-23ubuntu
ubuntulinux-tools-kvm (4.4.0.1146.143) @ xenial2026-05-23ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(3)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 13× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 126 total refreshes for this CVE.

  1. 2026-08-07 16:24 UTCEPSS rescore
  2. 2026-08-05 19:15 UTCEPSS rescore
  3. 2026-08-05 09:39 UTCEG score recompute
  4. 2026-08-05 09:39 UTCGHSA enrichment
  5. 2026-08-04 15:06 UTCEPSS rescore
  6. 2026-08-04 12:07 UTCEG score recompute
  7. 2026-08-04 12:07 UTCGHSA enrichment
  8. 2026-08-04 10:34 UTCEPSS rescore
  9. 2026-08-04 09:49 UTCEG score recompute
  10. 2026-08-04 09:49 UTCVendor advisory
  11. 2026-08-04 09:49 UTCGHSA enrichment
  12. 2026-08-03 10:33 UTCEPSS rescore
  13. 2026-08-02 02:24 UTCEPSS rescore
  14. 2026-08-01 04:13 UTCEPSS rescore
  15. 2026-07-31 21:12 UTCOSV refresh
  16. 2026-07-30 16:25 UTCEPSS rescore
  17. 2026-07-30 01:28 UTCEPSS rescore
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  23. 2026-07-23 14:16 UTCEPSS rescore
  24. 2026-07-23 02:06 UTCEG score recompute
  25. 2026-07-22 22:53 UTCEG score recompute
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  1. 2026-07-22 14:06 UTCEPSS rescore
  2. 2026-07-21 15:22 UTCEPSS rescore
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  5. 2026-07-19 14:29 UTCEPSS rescore
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  14. 2026-07-14 04:10 UTCOSV refresh
  15. 2026-07-13 22:27 UTCEPSS rescore
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  18. 2026-07-12 05:44 UTCEPSS rescore
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  20. 2026-07-09 19:07 UTCEPSS rescore
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  22. 2026-07-08 15:12 UTCEPSS rescore
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  24. 2026-07-07 13:43 UTCEPSS rescore
  25. 2026-07-06 16:25 UTCEPSS rescore
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  27. 2026-07-06 02:21 UTCEPSS rescore
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  31. 2026-07-04 06:29 UTCEPSS rescore
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  40. 2026-06-27 03:07 UTCEPSS rescore
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  42. 2026-06-26 01:46 UTCOSV refresh
  43. 2026-06-25 13:48 UTCEPSS rescore
  44. 2026-06-25 13:48 UTCEPSS rescore
  45. 2026-06-24 14:03 UTCEPSS rescore
  46. 2026-06-24 14:03 UTCEPSS rescore
  47. 2026-06-23 21:31 UTCEPSS rescore
  48. 2026-06-23 21:31 UTCEPSS rescore
  49. 2026-06-22 14:24 UTCEPSS rescore
  50. 2026-06-21 14:55 UTCEPSS rescore
  51. 2026-06-21 01:58 UTCEPSS rescore
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  53. 2026-06-19 19:24 UTCEPSS rescore
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  55. 2026-06-18 17:51 UTCEPSS rescore
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  68. 2026-06-10 13:20 UTCEPSS rescore
  69. 2026-06-08 14:41 UTCOSV refresh
  70. 2026-06-08 14:15 UTCEPSS rescore
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  73. 2026-06-07 15:23 UTCEPSS rescore
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  75. 2026-06-06 13:46 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-47576?
CVE-2021-47576 is a high vulnerability published on June 19, 2024. In the Linux kernel, the following vulnerability has been resolved: scsi: scsidebug: Sanity check block descriptor length in respmode_select() In respmodeselect() sanity check the block descriptor len to avoid UAF. BUG: KASAN: use-after-free in respmodeselect+0xa4c/0xb40…
When was CVE-2021-47576 disclosed?
CVE-2021-47576 was first published in the National Vulnerability Database on June 19, 2024, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47576 actively exploited?
CVE-2021-47576 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 84.8% of all scored CVEs.
What is the CVSS score of CVE-2021-47576?
CVE-2021-47576 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2021-47576?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47576, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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