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Review reviewHigh

CVE-2021-27364

cloud backup, linux kernel

An issue was discovered in the Linux kernel through 5.11.3. drivers/scsi/scsi_transport_iscsi.c is adversely affected by the ability of an unprivileged user to craft Netlink messages.

CVSS
7.1
EPSS
-
- percentile
CISA KEV
Not listed
Published
2021.03.07
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.1

Vulnerability overview

An issue was discovered in the Linux kernel through 5.11.3. drivers/scsi/scsi_transport_iscsi.c is adversely affected by the ability of an unprivileged user to craft Netlink messages.

Affected product and versions

Product
cloud backup, linux kernel
Affected versions
< 4.4.260, >= 4.5 < 4.9.260, >= 4.10 < 4.14.224, >= 4.15 < 4.19.179, >= 4.20 < 5.4.103, >= 5.5 < 5.10.21, >= 5.11 < 5.11.4, 9.0, >= 7.4.0 <= 7.7.1, 14.04, 16.04, 18.04, 20.04
Fixed versions
4.4.260, 4.9.260, 4.14.224, 4.19.179, 5.4.103, 5.10.21, 5.11.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that cloud backup, 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:N/A:H
CWE
CWE-125