HIGH

CVE-2021-27364

CVSS v3

7.1

HIGH

EPSS Score

1.0 %

exploit probability, as of 2026-10-18

CISA KEV

known exploited

Exploitation

—

SSVC status

Get an alert for each new CVE published for Linux kernel.

Set up CVE WatchFree account · no credit card

Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

kernel-abi-whitelistsAlmaLinux:8all versions · fixed in 4.18.0-240.22.1.el8_3and 1 other package

Vendor advisories

CVE-2021-27364 Red Hat Product Security1,339 products fixed
kernel: out-of-bounds read in libiscsi module
RHSA-2021:1531 Red Hat Product Security120 products fixed
Red Hat Security Advisory: kernel security and bug fix update
RHSA-2021:1532 Red Hat Product Security55 products fixed
Red Hat Security Advisory: kpatch-patch security update
RHSA-2021:1376 Red Hat Product Security111 products fixed
Red Hat Security Advisory: kernel security and bug fix update
RHSA-2021:1377 Red Hat Product Security45 products fixed
Red Hat Security Advisory: kpatch-patch security update
RHSA-2021:1379 Red Hat Product Security23 products fixed
Red Hat Security Advisory: kernel-alt security and bug fix update

14 more advisories

Full record on NVD

Description

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.

Technical details

Published: 2021-03-07

Frequently asked questions

What is CVE-2021-27364?

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.

Is CVE-2021-27364 actively exploited?

Active exploitation of CVE-2021-27364 has not been confirmed. Its EPSS score was 1.0% on 2026-10-18, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-27364?

CVE-2021-27364 has a CVSS v3 base score of 7.1 (HIGH severity).

Running Linux kernel? Hear about its next vulnerability

CVE Watch matches each new CVE to the vendors and products you list (vendor and product, not the version) and puts it in your alerts with its KEV and EPSS status.

Get alerts for this product CISA KEV additions, October 2026 Search CVEs

Already have an account? Open CVE WatchNo credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
Running this software? CVE Watch alerts you to new vulnerabilities in your products.

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database