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Review reviewHigh

CVE-2021-47576

Linux Linux, linux kernel

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+...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2024.06.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

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+...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 231839102b54512ced7d3ee7fc9b8bcf5e3b583b < adcecd50da6cab7b4957cba0606771dcc846c5a9, >= 231839102b54512ced7d3ee7fc9b8bcf5e3b583b < 90491283b4064220682e4b0687d07b05df01e3bf, >= 231839102b54512ced7d3ee7fc9b8bcf5e3b583b < 04181973c38f3d6a353f9246dcf7fee08024fd9e, >= 231839102b54512ced7d3ee7fc9b8bcf5e3b583b < b847ecff850719c46c95acd25a0d555dfd16e10d, >= 231839102b54512ced7d3ee7fc9b8bcf5e3b583b < a9078e791426c2cbbdf28a320c3670f6e0a611e6, >= 231839102b54512ced7d3ee7fc9b8bcf5e3b583b < dfc3fff63793c571147930b13c0f8c689c4281ac, >= 231839102b54512ced7d3ee7fc9b8bcf5e3b583b < e0a2c28da11e2c2b963fc01d50acbf03045ac732, >= 2.6.19, < 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
Fixed versions
4.9.294, 4.14.259, 4.19.222, 5.4.168, 5.10.88, 5.15.11

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416