CVE-2021-27363

Name: CVE-2021-27363
Creator: NVD / NIST
Published: 2021-03-07T04:15:13.33+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.4/10EPSS 0.71%

Last modified Jun 17, 2026

CVE-2021-27363 is a medium-severity vulnerability rated 4.4/10 on the CVSS scale. An issue was discovered in the Linux kernel through 5.11.3. A kernel pointer leak can be used to determine the address of the iscsi_transport structure. EPSS estimates a 0.71% chance of exploitation in the next 30 days.

Description

An issue was discovered in the Linux kernel through 5.11.3. A kernel pointer leak can be used to determine the address of the iscsi_transport structure. When an iSCSI transport is registered with the iSCSI subsystem, the transport's handle is available to unprivileged users via the sysfs file system, at /sys/class/iscsi_transport/$TRANSPORT_NAME/handle. When read, the show_transport_handle function (in drivers/scsi/scsi_transport_iscsi.c) is called, which leaks the handle. This handle is actually the pointer to an iscsi_transport struct in the kernel module's global variables.

Metrics

CVSS 3.1

4.4/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

EPSS Probability

0.71%

48.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	<= 5.11.3
Debian	Debian Linux	9.0
Netapp	Cloud Backup	All versions
Netapp	Solidfire Baseboard Management Controller Firmware	All versions

References

http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.htmlThird Party Advisory, VDB Entry
http://www.openwall.com/lists/oss-security/2021/03/06/1Mailing List, Patch, Third Party Advisory
https://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.htmlExploit, Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1182716Issue Tracking, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=688e8128b7a92df982709a4137ea4588d16f24aaMailing List, Patch, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00035.htmlThird Party Advisory
https://security.netapp.com/advisory/ntap-20210409-0001/Third Party Advisory
http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.htmlThird Party Advisory, VDB Entry
http://www.openwall.com/lists/oss-security/2021/03/06/1Mailing List, Patch, Third Party Advisory
https://blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.htmlExploit, Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1182716Issue Tracking, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=688e8128b7a92df982709a4137ea4588d16f24aaMailing List, Patch, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00035.htmlThird Party Advisory
https://security.netapp.com/advisory/ntap-20210409-0001/Third Party Advisory

Timeline

Published: Mar 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27363?

How severe is CVE-2021-27363?

CVE-2021-27363 has a CVSS score of 4.4/10 (MEDIUM severity). The EPSS model estimates a 0.71% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27363?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-27363?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST