7.8

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

Modified
AliasesUBUNTU-CVE-2021-47576DEBIAN-CVE-2021-47576
Published 19-06-2024Last modified 05-08-2026

Vulnerability summary

CVE-2021-47576 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 17.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.26%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 13 · Related 13
SUSE-SU-2024:2360-1SUSE-SU-2024:2362-1SUSE-SU-2024:2372-1SUSE-SU-2024:2381-1SUSE-SU-2024:2384-1SUSE-SU-2024:2394-1

Timeline

  1. 19-06-2024
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

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

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

17%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.26% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu88 products
  • linuxAll versions (No fix recorded) | < 4.4.0-270.304 | < 4.15.0-169.177 | < 5.4.0-105.119
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1145.151 | < 4.4.0-1183.198 | < 4.15.0-1121.129 | < 5.4.0-1069.73
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 231839102b54512ced7d3ee7fc9b8bcf5e3b583b, < adcecd50da6cab7b4957cba0606771dcc846c5a9 | ≥ 231839102b54512ced7d3ee7fc9b8bcf5e3b583b, < 90491283b4064220682e4b0687d07b05df01e3bf | ≥ 231839102b54512ced7d3ee7fc9b8bcf5e3b583b, < 04181973c38f3d6a353f9246dcf7fee08024fd9e | ≥ 231839102b54512ced7d3ee7fc9b8bcf5e3b583b, < b847ecff850719c46c95acd25a0d555dfd16e10d | ≥ 231839102b54512ced7d3ee7fc9b8bcf5e3b583b, < a9078e791426c2cbbdf28a320c3670f6e0a611e6 | ≥ 231839102b54512ced7d3ee7fc9b8bcf5e3b583b, < dfc3fff63793c571147930b13c0f8c689c4281ac | ≥ 231839102b54512ced7d3ee7fc9b8bcf5e3b583b, < e0a2c28da11e2c2b963fc01d50acbf03045ac732 | 2.6.19
  • linux_kernel< 4.9.294 | ≥ 4.10, < 4.14.259 | ≥ 4.15, < 4.19.222 | ≥ 4.20, < 5.4.168 | ≥ 5.5, < 5.10.88 | ≥ 5.11, < 5.15.11
Debian1 product
  • linux< 5.15.15-1

3 vendors · 91 products

References

14 links
Show all 14 references